CN108647853B - Harmful organism epidemic situation evaluation and analysis method - Google Patents
Harmful organism epidemic situation evaluation and analysis method Download PDFInfo
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Abstract
The invention discloses a pest epidemic situation evaluation and analysis method. The epidemic situation evaluation and analysis method provided by the invention needs field investigation quantity, during investigation, an investigation area is firstly determined, then all red fire ant nest areas of a sampling point area are investigated and marked by a GPS, the characteristics of each red fire ant nest area, including the size of the ant nest, the activity of harmless ants, the distance from a crowd and the like, are calculated and recorded, on the basis of investigation, an environmental risk index I, an ant nest standard index Q and an ant nest sample ratio P are calculated according to the evaluation method, finally, the epidemic situation index is calculated for grading, and the proportion of all levels of epidemic situations in the total investigation area sampling points is calculated. The method synthesizes the influence of human activity factors in the ecological environment on the epidemic situation of the solenopsis invicta in the area, and can comprehensively and reasonably evaluate the invasion situation of the solenopsis invicta in the area.
Description
The technical field is as follows:
the invention belongs to the technical field of pest control and pest monitoring, and particularly relates to a pest epidemic situation evaluation and analysis method.
Background art:
solenopsis invicta has been incorporated by international organization as a dangerous invasive organism as a very aggressive foreign invasive pest. The south China area has high temperature and humidity, is suitable for survival and propagation, and in addition, the red imported fire ants can grow in four ways in Guangdong, Guangxi, Hunan, Hongkong and Australian areas in China due to the lack of natural enemy control of the original place. The red fire ants show a wedding reproduction phenomenon after raining, so that the species can continuously spread to the periphery. Meanwhile, along with increasing urbanization, residential areas, parks and other residential living areas need a large amount of arbor flowers for greening and decoration in the construction, and the solenopsis invicta can be remotely diffused through a greening plant trade way, so that the epidemic severity is deepened. The social habits of the red fire ants are that the red fire ants often attack living organisms which are mistakenly stepped into the territorial area of the red fire ants, including sanitation workers, operation farmers, leisure area visitors and the like, and sting the skin of the living organisms to release venom through the tail ends of the abdomens, so that chronic or acute poisoning symptoms are caused.
Since the red imported fire ants, the invasion organisms have more and more serious harm to people and crops, and the damage is increased, so that people pay more and more attention to the monitoring, prevention and control of the invasion organisms and set up a relative emergency plan. The investigation and monitoring of the epidemic situation in the area are used as important means for prevention and control, and the long-term investigation work is kept to have important significance.
At present, the epidemic situation of the solenopsis invicta in an evaluation area is classified into 1-5 grades according to the number of live ant nests per unit area by adopting a national standard rating method. The investigators usually mark the red fire ants found in the investigation places in corresponding maps, record the number of the red fire ants, calculate the incidence rate of the investigation areas, and analyze the occurrence degree of the ant damage according to the density of the ant nests.
However, in different ecological environments, even if the same red fire ant nest occurs, the danger degree is different, for example, the same green road, green road in leisure tourism areas and green road activities in urban highways are different, the former has workers, green workers and sightseeing guests, and the latter only has green workers, so even if the same red fire ant nest has different danger degree, the danger degree is also different, the former has workers, cultivators and sightseeing guests, and the latter only has agricultural cultivators, like farmland cultivated land, common cultivated land and sightseeing agricultural cultivated land. The degrees of epidemic situations are different because the active people in the environment are different and the dangerousness of selling the red imported fire ants is different, but the influence of the environmental factors is not fully considered in the conventional evaluation method.
The invention content is as follows:
the invention aims to provide a method for evaluating and analyzing pest epidemic situation, which fully considers environmental factors and uses a standard numerical form to contain regional characteristics and human activities in indexes so as to effectively, simply and clearly evaluate the pest epidemic situation.
The invention provides a pest epidemic situation evaluation and analysis method, which comprises the following steps:
determining an expression of an epidemic index R of pest epidemic evaluation: r is I × Q × P (1)
In the formula (1), I is an environmental risk index, Q is a standard index of the pest nest, and P is a sample ratio of the pest nest;
the environment risk index I is 1-4, Di is Ai multiplied by Bi multiplied by Ci, Ai is fixed or not, if the person is fixed, Ai is 1, if the person is not fixed, Ai is 2, Bi is continuous or not, if the person is not continuous, Bi is 1, if the person is continuous, Bi is 2, Ci is the number of people, if the number of people is small, Ci is 1, and if the number of people is large, Ci is 2;
the standard index Q of the pest nest is selected from Q1、Q2、Q3And Q4In the above-mentioned manner, the first and second substrates are,
the nest in the formulas (2) to (5) is classified into 5 grades according to the size of the nest, when the nest is larger than 0.1cm and less than or equal to 10cm, the nest is 1 grade, when the nest is larger than 10cm and less than or equal to 20cm, the nest is 2 grade, when the nest is larger than 2 cm and less than or equal to 30cm, the nest is 3 grade, when the nest is larger than 20cm and less than or equal to 30cm, the nest is 3 grade, when the nest is larger than 30cm and less than or equal to 40cm, the nest is 4 grade, when the nest is larger than 40cm, the nest is 5 grade, and the nest is 5 grade; in the presence/absence of living pests in the formulas (2) and (4), the presence of living pests is 1, and the absence of living pests is 0; in the formulas (3) and (4), the radial distance between the nest and the human is more than 320cm, d is 0, the radial distance between the nest and the human is more than 160cm and less than or equal to 320cm, d is 0.5, the radial distance between the nest and the human is more than 80cm and less than or equal to 160cm, d is 1, the radial distance between the nest and the human is more than 40cm and less than or equal to 80cm, d is 1.5, the radial distance between the nest and the human is less than or equal to 40cm, and d is 2; in the formulas (2) to (5), 5 is the maximum ant nest grade number, 1 is the highest weight number of live pests, and 2 is the maximum risk value of the pests from the crowd;
in the formula (6), the number M of harmful organism nests in the investigation region is the sum of the number Ni of harmful organism nests in all investigation sample points;
according to the size of an epidemic situation index R, the epidemic situation grading index T has 5 stages including 1 stage, 2 stage, 3 stage, 4 stage and 5 stage, the epidemic situation index R is less than 0.1 stage, the T is 1 stage, the epidemic situation index R is 0.1-10.0 stage, the T is 2 stage, the epidemic situation index R is 10.0-50.0 stage, the T is 3 stage, the epidemic situation index R is 50.0-100.0 stage, the T is 4 stage, the epidemic situation index R is more than 100.0 stage, and the T is 5 stage.
Fixed, Ai, indicates whether a person is stationarily present in the area of investigation, and determining whether a class of people is stationarily within the area of investigation may require that the location be fixed based on the activity or activity they are doing in that area.
Persistence, Bi, indicates whether a group of people continuously performs certain activities per unit time, and repeats the presence of this type of people in the area, separating different behavioral activities by persistence. The constant presence of personnel in the pest-affected area poses a higher risk of incurring pest damage than if the personnel were not present continuously.
The number of people, Ci, represents the number of people in the category group in the survey area. The greater the number of people, the more likely there is personal injury in the population.
Preferably, I ═ D is used1+D2+D3+D4D1 is a few resident people, D2More resident people, D3A few and no continuous visitors D4Many people do not have continuous visitors.
Preferably, the epidemic situation grading index 1 grade is a harmless area, the epidemic situation grading index 2 grade is a mild harm area, the epidemic situation grading index 3 grade is a moderate harm area, the epidemic situation grading index 4 grade is a medium-bias harm area, and the epidemic situation grading index 5 grade is a severe harm area.
The invention counts the number of the occurrence sample points of the epidemic situation with the same degree, and calculates the proportion of the occurrence sample points in the total investigation area by the following formula to obtain the overall situation of the epidemic situation:
preferably, the standard index Q of the pest nest is Q4，
Q1Considering the size of the ant nests and the number of the ant nests, only the ant nests with the active ants are recorded during investigation; q2Considering the size of the ant nests, the number of the ant nests and the distance between the ant nests and the crowd, recording the ant nests of all the red fire ants during investigation; q3Considering the number of the ant nests, the size of the ant nests and the harmless ant activities, only the ant nests with the movable ants are investigated and recorded during investigation; q4Considering the number of the ant nests, the size of the ant nests, the activities of harmless ants, the distance between the ant nests and the crowd and the like, the ant nests of all the red fire ants are recorded during investigation. In the actual evaluation, only one of the standard methods is selected, and the invention preferably uses Q4The method of (3).
The number ratio of the sample point pest nests is the percentage of the sample number in the total, and the number ratio of the investigation sample point pest nests is the percentage of the investigation sample point pest nest number in the investigation region, namely:
when j is 1, P1The number ratio of the nest with live pests in the pest investigation sample points corresponds to the nest standard value Q1、Q3；
When j is 2, P2For the number ratio of all the nests in the pest investigation sample points, the corresponding nest standard value Q2、Q4。
Preferably, the pest is a red imported fire ant. According to the characteristics of the crowd activities in the investigation region, different weights are given, and then the occurrence situation of the red fire ant epidemic situation is comprehensively evaluated by combining the occurrence situation of the ant damage.
Aiming at the pest whether the red imported fire ant is harmful, the epidemic situation evaluation and analysis method adopted by the invention comprises the following specific steps:
1) and giving different weights according to the characteristics of the active population in the ecological environment to obtain an environmental risk index. The characteristics and weights of the active population in the ecological environment are respectively weighted to be 1 or 2 according to the number of people, whether the people exist continuously or not and whether the people are fixed or not, and the results are shown in the following table 1.
TABLE 1
According to the weights in the table 1, the people in the ecological environment are classified, and the weight scores of different people in the ecological environment are calculated, wherein the calculation method comprises the following steps: the population risk weight D ═ a × B × C, as shown in table 2:
TABLE 2
The environmental risk index I was calculated for different ecoenvironments in table 2 according to the active population for epidemic evaluation. Environmental risk index I ═ D1+D2+D3+D4As shown in table 3:
TABLE 3
Wherein, the leisure tourism places comprise parks, green roads, courier stations, sightseeing farms and the like.
2) Aiming at the investigated red fire ant occurrence conditions in the ecological environment, the method comprises the data of the number of ant nests, the size of the ant nests, the harmless ant activities, the distance between the ant nests and crowds and the like, and the standard weight values are assigned to the ant nests, the harmless ant activities and the distance between the ant nests and the crowds in a grading manner.
(1) Ant nest size grading, as shown in table 4:
TABLE 4
(2) The weights of ant nests with/without live ants are shown in table 5:
TABLE 5
(3) The distance from the crowd (attacker risk) represents the physical distance between pests and human beings, and the radius distance from the center point to the place where people live and work is met by taking the recorded nest of the red imported fire ants as the center indirectly represents the opportunity that the pests can contact the human beings;
the grade far represents that the ant nest is taken as the center, the radius is larger than 320cm, the ant nest meets the human, and the numerical value is 0 and is substituted into the formula; the grade generally represents that the ant nest is taken as the center, the radius is more than 160cm and less than or equal to 320cm, the human beings are encountered, and the numerical value is 0.5 and is substituted into the formula; grade near represents that the ant nest is taken as the center, the radius is more than 80cm and less than or equal to 160cm, the ant nest meets human beings, and the numerical value is 1 and is substituted into the formula; the closer grade represents that the ant nest is taken as the center, the radius is more than 40cm and less than or equal to 80cm, the value is 1.5, the formula is substituted, the closer grade represents that the ant nest is taken as the center, the radius is less than or equal to 40cm, the human is encountered, and the value is 2, the formula is substituted; as shown in table 6:
TABLE 6
(4) Standardized scoring of ant nest occurrence
According to the investigation result, obtaining the data of standardized weight values such as the number of ant nests in the investigation sample points, the size of the ant nests, the activities of harmless ants and the distance between the ant nests and the crowd, and calculating according to the following formula to obtain ant nest standard values Qi, i is 1, 2, 3 and 4;
in formulae (12) to (15):
5 is the maximum ant nest grade number, 1 is the maximum weight number of the ant with or without activity, and 2 is the maximum risk value of the ant nest from the crowd.
Q1Considering the size of the ant nests and the number of the ant nests, only the ant nests with the active ants are recorded during investigation; q2Considering the size of the ant nest, the number of the ant nests and the antsThe nest distance is from the crowd, and the ant nests of all the red fire ants are recorded during investigation; q3Considering the number of the ant nests, the size of the ant nests and the harmless ant activities, only the ant nests with the movable ants are investigated and recorded during investigation; q4Considering the number of the ant nests, the size of the ant nests, the activities of harmless ants, the distance between the ant nests and the crowd and the like, the ant nests of all the red fire ants are recorded during investigation. One of the standard methods is selected in the evaluation, and the present invention gives priority to Q4To calculate.
3) And investigating the proportion of the number of the ant nests in the ecological environment sampling points in the investigation region.
(1) Number of ant nests in investigation area:
the number Mj of the ant nests in the investigation region is the sum of the number Ni of the ant nests in the investigation sampling points, namely:
number of ant nests M in investigation regionjNumber of ant nests found by searching sigma-shaped survey sampling pointsi
When j is 1, M1For investigating the number of ant nests with movable ants in the area, the corresponding ant nest standard value Q1、Q3；
When j is 2, M2For investigating the number of all ant nests in an area, the corresponding ant nest standard value Q2、Q4。
(2) And (3) surveying the number ratio of the ant nests of the sample points:
the sampling point number ratio is the percentage of the sample number in the total, and the survey sampling point ant nest number ratio is the percentage of the survey sampling point ant nest number in the survey area, namely:
when j is 1, P1The number ratio of the ant nests with movable ants in the ant nest investigation sample points corresponds to the ant nest standard value Q1、Q3；
When j is 2, P2For the ant nest quantity ratio in the investigation sampling points, corresponding to the ant nest standard value Q2、Q4。
4) According to the invention, the epidemic situation index R is used for evaluating the occurrence degree of the red imported fire ants, the epidemic situation index is a comprehensive evaluation index, the environmental risk index I, the ant nest standard value Q and the ant nest quantity proportion P are integrated, and the calculation method comprises the following steps:
epidemic situation index R is environment risk index I multiplied by ant nest standard index Q multiplied by ant nest sample ratio P
5) According to the epidemic situation index, the epidemic situation of the red fire ants is evaluated in 5 grades. 1. 2, 3, 4 and 5, and the corresponding epidemic situation index values are shown in the following table, wherein the 1 grade is a harmless area, the 2 grade is a mild harm area, the 3 grade is a moderate harm area, the 4 grade is a medium-heavy harm area, and the 5 grade is a severe harm area, as shown in table 7:
TABLE 7
Unless otherwise defined, the present invention is directed to the definitions of terms having the same meaning as commonly understood by one of ordinary skill in the art.
Compared with the prior art, the invention has the following advantages:
(1) the evaluation method needs field investigation quantity, during investigation, an investigation area is determined, then all the ant nests of the solenopsis invicta sample point area are investigated and marked by a GPS, and the characteristics of each ant nest, including the size, the activity of harmless ants, the distance from crowds and the like, are calculated and recorded. On the basis of investigation, calculating an environmental risk index I, an ant nest standard index Q and an ant nest sample ratio P according to the evaluation method, finally calculating epidemic situation indexes of the ant nests for classification, and calculating the proportion of all levels of epidemic situations in a total investigation area sample point.
(2) The method synthesizes the influence of human activity factors in the ecological environment on the epidemic situation of the solenopsis invicta in the area, and can comprehensively and reasonably evaluate the invasion situation of the solenopsis invicta in the area.
The specific implementation mode is as follows:
in order to describe the invention, examples are set forth below. It is to be understood that the invention is not limited to these embodiments, but is provided as a means of practicing the invention.
Example 1: survey sampling point environmental risk weight calculation
The experimental site: 31 total sample point environmental risk indexes in the gold bay area of the Zhuhai city endow different weights for the characteristics of active people in the sample points, and the environmental risk indexes are obtained. The method comprises the following steps of classifying the crowds in sampling points according to whether the people are fixed (A), whether the people continuously exist (B) and the number of people (C), and respectively calculating the weight scores of different people, wherein the calculation method comprises the following steps: the population risk weight D ═ a × B × C.
The results are shown in Table 1 by the number of people, whether there is persistence, and whether people are fixed, with weights of 1 or 2, respectively.
TABLE 1
According to the weights in the table 1, the people in the ecological environment are classified, and the weight scores of different people in the ecological environment are calculated, wherein the calculation method comprises the following steps: the population risk weight D ═ a × B × C, i.e.: few resident D1＝A1×B1×C1＝1×2×1＝2，D2＝A2×B2×C2＝2×2×1＝4，D3＝A3×B3×C3＝1×1×2＝2，D4＝A4×B4×C4The population risk weight scores are shown in table 2, 2 × 2 ═ 8:
TABLE 2
The environmental risk index I was calculated for different ecoenvironments in table 2 according to the active population for epidemic evaluation. Environmental risk index I ═ D1+D2+D3+D4As shown in table 3:
TABLE 3
Wherein, the leisure tourism places comprise parks, green roads, courier stations, sightseeing farms and the like.
And calculating the 31 sampling point environmental risk indexes according to the numerical values obtained in the tables 1-3 to obtain an environmental risk weight number I, which is shown in a table 8.
TABLE 8
Example 2: number ratio of ant nests of survey sampling points
According to 31 sampling points in the gold gulf area of the Kyoho in example 1, the occurrence of the red fire ants in each survey sampling point is recorded, such as the results of the water and countryside survey of the Jinshan park and the flower field.
Grading the ant nest size, the harmless ant activities and the distance between the ant nest and the crowd to obtain standard weight values, as shown in tables 4-6:
(1) ant nest size grading, as shown in table 4:
TABLE 4
(2) The weights of ant nests with/without live ants are shown in table 5:
TABLE 5
(3) Distance from population (aggressor risk), as shown in table 6:
TABLE 6
1. The investigation of red fire ants in gold mountain park of gold bay district of the zhuyi city, the lawn of gold mountain park of field investigation and greenbelt on every side, 66 nests of red fire ants are found in the lawn, are located the roadside, according to table 4 ~ 6, the record is as shown in table 9:
TABLE 9
2. The investigation of the red fire ants in the flower field, water and countryside of the gold bay area in the pearl sea city, the investigation of the flower field, water and countryside grassland on the spot, and the 74 nests of the red fire ants are found, wherein the 71 nests have the activity of the live and harmful ants, and according to tables 4-6, the records are as shown in table 10:
watch 10
Example 3: standardized scoring of ant nest occurrence
According to the formulas (12) to (15), the ant nest standard values Qi, i-1, 2, 3, 4 are calculated,
q was calculated from the data of tables 9 and 10 in example 2, taking Jinshan park as an example1、Q2、Q3And Q4The value of (a) is,
the results of calculating the standard value of the ant nest generation of red fire ants in Jinshan parks and Huatian paddy fields are shown in Table 11:
TABLE 11
| Jinshan park | Flower field water village | |
| Ant nest standard value Q1 | 0.73 | 0.27 |
| Ant nest standard value Q2 | 0.73 | 0.26 |
| Ant nest standard value Q3 | 0.73 | 0.27 |
| Ant nest standard value Q4 | 0.73 | 0.26 |
Example 4: ant nest quantity ratio of survey sampling points, epidemic situation index and epidemic situation grading calculation
(1) 526 ant nests are found in total in 30 sample points in the gold bay area of the Zhuhai city, 503 ant nests of active ants are found, the proportion of the number of the ant nests in all investigation areas in the sample points for investigating the ecological environment is calculated, and the calculation method is as follows:
and the number M of the ant nests in the investigation region is the sum of the numbers Ni of all the ant nests of the investigation sampling points.
When j is 1, P1The number ratio of the ant nests with movable ants in the ant nest investigation sample points corresponds to the ant nest standard value Q1、Q3；
When j is 2, P2For the ant nest quantity ratio in the investigation sampling points, corresponding to the ant nest standard value Q2、Q4。
(2) The P values of 31 survey sampling points in the gold gulf area are calculated according to the formula (16) to obtainJinshan park as an example, P1＝66/503×100％＝13.12％，P2The calculation results are shown in table 12 when 66/526 × 100% is 12.55%, and the I values in table 12 are obtained from table 8:
TABLE 12
Example 5: ant nest quantity ratio of survey sampling points, epidemic situation index and epidemic situation grading calculation
(1) 31 sample points in the gold bay area of the investigation pearl sea city, the environmental risk index I, the ant nest standard value Q and the ant nest quantity P of each investigation sample point are shown in the following table, and the epidemic situation index R of the red fire ants is calculated according to the following formula:
epidemic situation index R is environment risk index I multiplied by ant nest standard index Q multiplied by ant nest sample ratio P
Calculation of R values the results are given in Table 14 below, R1Corresponds to Q1，R2Corresponds to Q2，R3Corresponds to Q3，R4Corresponds to Q4。
Take Jinshan park as an example:
R1＝I1×Q1×P1＝14×0.73×13.12＝134.08，R2＝I2×Q2×P2＝14×0.73×12.55＝128.26，
R3＝I3×Q3×P1＝14×0.73×13.12＝134.08，R4＝I4×Q4×P2＝14×0.73×12.55＝128.26。
(2) 31 sampling points of the Jinwan area of the Zhehai market are investigated, each investigation sampling point is graded according to the epidemic situation index, the epidemic situation grading index T has 5 grades of 1, 2, 3, 4 and 5, wherein the epidemic situation index R of 1 grade is 0, the epidemic situation index R of 2 grade is 0-10.0, the epidemic situation index R of 3 grade is 10.1-50.0, the epidemic situation index R of 4 grade is 50.1-100.0, and the epidemic situation index R of 5 grade is more than 100.0. The results are shown in Table 14.
TABLE 14
Example 6: ant nest quantity ratio of survey sampling points, epidemic situation index and epidemic situation grading calculation
According to the calculation of the embodiment 1-5, the number of the sampling points of the epidemic situation with the same degree is counted to obtain the number of the harmless areas, the slight harmful areas, the moderate harmful areas, the medium heavy harmful areas or the serious harmful areas, and the proportion of the sampling points in the total investigation area is calculated according to the following formula:
the results of the statistical analysis are shown in table 15 below:
watch 15
In embodiments 1 to 6, an investigation region is determined, then all solenopsis invicta ant nests in a sampling point region are investigated and GPS marked, the characteristics of each solenopsis invicta ant nest, including the size, the activity of harmless ants, the distance from a crowd and the like, are calculated and recorded, on the basis of investigation, an evaluation method is performed, an environmental risk index I, an ant nest standard index Q and an ant nest sample ratio P are calculated, finally, epidemic indexes are calculated for classification, and the proportion of all levels of epidemics in the total investigation region sampling points is calculated.
Claims (5)
1. A pest epidemic situation evaluation and analysis method is characterized by comprising the following steps:
determining an expression of an epidemic index R of pest epidemic evaluation: r is I × Q × P (1)
In the formula (1), I is an environmental risk index, Q is a standard index of the pest nest, and P is a sample ratio of the pest nest;
the environment risk index I is 1-4, Di is Ai multiplied by Bi multiplied by Ci, Ai is fixed or not, if the person is fixed, Ai is 1, if the person is not fixed, Ai is 2, Bi is continuous or not, if the person is not continuous, Bi is 1, if the person is continuous, Bi is 2, Ci is the number of people, if the number of people is small, Ci is 1, and if the number of people is large, Ci is 2;
the standard index Q of the pest nest is selected from Q1、Q2、Q3And Q4In the above-mentioned manner, the first and second substrates are,
the nest in the formulas (2) to (5) is classified into 5 grades according to the size of the nest, when the nest is larger than 0.1cm and less than or equal to 10cm, the nest is 1 grade, when the nest is larger than 10cm and less than or equal to 20cm, the nest is 2 grade, when the nest is larger than 2 cm and less than or equal to 30cm, the nest is 3 grade, when the nest is larger than 20cm and less than or equal to 30cm, the nest is 3 grade, when the nest is larger than 30cm and less than or equal to 40cm, the nest is 4 grade, when the nest is larger than 40cm, the nest is 5 grade, and the nest is 5 grade; in the presence/absence of living pests in the formulas (2) and (4), the presence of living pests is 1, and the absence of living pests is 0; in the formulas (3) and (4), the radial distance between the nest and the human is more than 320cm, d is 0, the radial distance between the nest and the human is more than 160cm and less than or equal to 320cm, d is 0.5, the radial distance between the nest and the human is more than 80cm and less than or equal to 160cm, d is 1, the radial distance between the nest and the human is more than 40cm and less than or equal to 80cm, d is 1.5, the radial distance between the nest and the human is less than or equal to 40cm, and d is 2;
in the formulas (2) to (5), 5 is the maximum ant nest grade number, 1 is the highest weight number of the living pests, and 2 is the maximum risk value of the pests from the crowd;
in the formula (6), the number Mj of harmful organism nests in the investigation region is the sum of the number Ni of harmful organism nests in all investigation sample points;
according to the size of an epidemic situation index R, the epidemic situation grading index T has 5 levels including 1 level, 2 level, 3 level, 4 level and 5 level, the epidemic situation index R is 0 level, the T level is 1 level, the epidemic situation index R is larger than 0 and smaller than or equal to 10.0 level, the T level is 2 level, the epidemic situation index R is larger than 10.1 and smaller than or equal to 50.0 level, the T level is 3 level, the epidemic situation index R is larger than 50.1 and smaller than or equal to 100.0 level, the T level is 4 level, the epidemic situation index R is larger than 100.0 level, and the T level is 5 level.
2. The method of claim 1, wherein I ═ D is used as the indicator of pest epidemic situation1+D2+D3+D4Said D is1Being a few resident people, D2More resident people, D3A few and no continuous visitors D4Many people do not have continuous visitors.
3. A method for evaluating and analyzing pest epidemic according to claim 1 or 2, wherein the pest is solenopsis invicta.
4. A pest epidemic evaluation analysis method according to claim 1 or 2, characterized in that the epidemic classification index 1 grade is a harmless zone, the epidemic classification index 2 grade is a mild harmful zone, the epidemic classification index 3 grade is a moderate harmful zone, the epidemic classification index 4 grade is a medium-heavy harmful zone, and the epidemic classification index 5 grade is a severe harmful zone.
5. A pest epidemic situation assessment and analysis method according to claim 1 or 2, wherein said pest nest standard index Q is Q4，
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