CN101099481B - Insecticide composition for preventing rice from insect pest - Google Patents

Abstract

The present invention relates to a pesticide composite for controlling injurious pests of rice. Said pesticide composite contains (by wt%) 0.2-10% of fipronil and 10-50% of dimethoate. Said pesticidecomposite can obtain good control effect for killing rice fulgorid, rice planthopper, paddy borer and rice leaf roller, etc.

Description

A kind of insecticides of preventing and treating rice grub

Technical field

The invention belongs to technical field of compounded pesticide, be specially a kind of insecticides of preventing and treating rice grub.

Background technology

Adjustment along with Chinese economic development and agricultural planting industry structure, deep variation has taken place in rice district, China south cropping system, add that migratory pest (rice leaf roller and rice fulgorid) in recent years takes place greatly continuously, winter climate warm up striped rice borer, paddy stem borer, pink rice borer and the small brown rice planthopper etc. that cause this locality to be survived the winter partially and go up significantly, effective control of insect has been become one of important content of China's paddy rice Sustainable Production.Fluorine worm nitrile (Fipronil) is the major product that is used for the rice grub control that Bayer crop science company produces, its preparation special suspending agent of 5% sharp strength facts have proved in China's rice district large scale application, it all has good control efficiency to insects such as rice grub such as rice leaf roller, striped rice borer, rice fulgorid, oryza chinensis, in 2005 and 2006 huge effect has been brought into play in the further harm that suppresses brown planthopper especially.But some place is as the Wenzhou City in south, Zhejiang, owing to rely on fluorine worm nitrile too much, for a long time continuously in order to control striped rice borer and rice fulgorid, cause striped rice borer that it has been produced the pesticide resistance of height,, the control efficiency of striped rice borer is obviously descended though usage amount increases.Zhejiang Xinnong Chemical Co.,Ltd uses on market in a large number in 31% fluorine nitrile azoles phosphorus microemulsion of exploitation in 2005 and registration, the result shows has good control efficiency to rice leaf roller, is in the market to one of the highest prescription of high instar larvae preventive effect.But because the adhesion of microemulsion is strong, soup sticks on the rice leaf easily, and is undesirable to the insect of harm rice bar such as striped rice borer, rice fulgorid control efficiency.Evidence occupy the harm of rice strain middle and lower part in paddy rice late growth stage control rice fulgorids, striped rice borer, paddy stem borer etc. still missible oil, aqua etc. arrive biohazard place easily, and control efficiency is better.

In order to give full play to advantages such as the fipronil insecticidal spectrum is wide, high to paddy rice primary pest activity, consumption is few, the lasting period is long, overcome that use cost is higher, quick-acting difference and use drawback such as easily cause that insect develops immunity to drugs continuously, make fluorine worm nitrile in the rice disease and pest integrated control, bring into play bigger effect.Select for use China have at present certain production scale, use cost lower, the known agricultural chemicals of people and animals' (comprising fish, honeybee) low toxicity is carried out reasonably composite with it, filter out the important topic that the tangible insecticides of synergy becomes current pesticide industry.

Fluorine worm nitrile (Fipronil, have another name called the special Regent of sharp strength); chemical name is: (RS)-and 5-amino-1-(2; 6-two chloro-a; a; the a-trifluoromethyl-)-4-trifluoromethyl sulfinyl pyrazoles-3-nitrile; molecular formula: C12H4Cl2F6N4OS is known substance, is produced by Bayer crop science company.It is a kind of novel Phenylpyrazole insecticides, thereby its mechanism of action is to combine the normal function of the chloride channel interference insect central nervous system of blocking the nerve center cell with gamma-aminobutyric acid receptor on the insect nerve center cell membrane and cause insect death.Insecticidal spectrum is wide, and various insects such as Homoptera, orthoptera, Semiptera, thrips and coleoptera are had stomach toxicity, action of contace poison and certain systemic function is arranged.

Rogor (Dimethoate), chemical name is: O, O-dimethyl-S-(N-methylamino formyl methyl) phosphorodithioate, molecular formula: C5H12NO3PS2, being known substance, being produced by many enterprises such as Hangzhou insecticide factories, is a kind of to the moderately toxic organophosphorus insecticide of people and animals.Can be oxidized to the higher flolimat of toxicity in insect bodies, its mechanism of action is the acetylcholinesterase that suppresses in the insect bodies, can hinder nerve conduction and causes death.Insecticidal spectrum is wide, speed of action is fast, and insect and mite class are had powerful tagging and certain stomach poison function.Insects such as rice fulgorid, rice leafhopper, aphid, coccid and two spotted spider mite there is good control efficiency.

Summary of the invention

At the above-mentioned problems in the prior art, the object of the invention is according to the actual insect pest situation of China paddy rice, take all factors into consideration the optimum synergistic effect and the production cost of fluorine worm nitrile and Rogor, the technical scheme of long, lower-cost insecticides of wide, quick-acting good, lasting period of a kind of insecticidal spectrum is provided.

The present invention be achieved in that according to fluorine worm nitrile and Rogor separately characteristic its carry out reasonably compositely, through series of indoor biologicall test and field trial, filter out the tangible combination matching of synergy.

Described a kind of insecticides of preventing and treating rice grub is characterized in that containing the component of following weight percent: fluorine worm nitrile 0.2～10%, Rogor 10～50%.

Described a kind of insecticides of preventing and treating rice grub, the content that it is characterized in that fluorine worm nitrile is 0.2～8%, the content of Rogor is 15～40%.

Described a kind of insecticides of preventing and treating rice grub, the content that it is characterized in that fluorine worm nitrile is 0.2～6%, the content of Rogor is 20～35%.

Described a kind of insecticides of preventing and treating rice grub, the content that it is characterized in that fluorine worm nitrile is 0.2～4%, the content of Rogor is 22～32%.

Described a kind of insecticides of preventing and treating rice grub, the content that it is characterized in that fluorine worm nitrile is 0.2～2%, the content of Rogor is 25～30%.

Described a kind of insecticides of preventing and treating rice grub, the content that it is characterized in that fluorine worm nitrile is 0.2～1.8%, the content of Rogor is 28～30%.

The insecticides of this kind control rice grub can be made into missible oil by existing routine techniques, adds organic solvent and emulsifier in the promptly former medicine, also can be made into aqueous emulsion, and promptly former medicine adds organic solvent, cosolvent, wetting agent, diffusant, emulsifier and water etc.

In the patent application of the present invention, unless otherwise indicated, all percentages all are weight percentage.

Above-mentioned a kind of insecticides of preventing and treating rice grub, has best synergistic function, co-toxicity coefficient to brown planthopper reaches 246.9～499.0, insecticidal spectrum is wide, and quick-acting good with lasting effect, cost is lower, greatly reduce the production and the use cost of agricultural chemicals, than single mu use cost decline 30-50% with fluorine worm nitrile, rice fulgorid, striped rice borer and rice leaf roller all there are good control efficiency, rice growth is had no adverse reaction.

Embodiment

Below one five provide embodiment to prescription by filling a prescription, and the present invention is described in further detail in conjunction with the test example.

Prescription one: fluorine worm nitrile 0.2%, Rogor 29.8%

Prescription two: fluorine worm nitrile 0.6%, Rogor 29.4%

Prescription three: fluorine worm nitrile 1.0%, Rogor 29.0%

Prescription four: fluorine worm nitrile 1.4%, Rogor 28.6%

Prescription five: fluorine worm nitrile 1.8%, Rogor 28.2%

Test example 1:

Composite dose of above-mentioned five fluorine worm nitrile Rogor and 80% fluorine worm nitrile water dispersant and 40% dimethoate emulsifiable concentrate with 3 age the brown planthopper nymph be object, carry out biologicall test indoor, and compare with clear water, its test of pesticide effectiveness the results are shown in Table 1.By calculating LC ₅₀After the co-toxicity coefficient of trying to achieve see Table 2:

Each processing of table 1 is to the biological activity determination result of brown planthopper

	Concentration (mg/L)	Examination borer population (head)	Death toll (head)	Lethality (%)	Corrected mortality (%)
						CK (clear water)	0	50	2	4	/
Fluorine worm nitrile	0.048	50	7	14	10.42
							0.24	50	16	32	29.17
	1.2	50	28	56	54.17
							6	50	42	84	83.33
	30	50	49	98	97.92
						Rogor	70	50	7	14	10.42
	140	50	13	26	22.92
							280	50	21	42	39.58
	560	50	35	70	68.75
							1120	50	46	92	91.67
Prescription one	25	50	6	12	8.33
							50	50	14	28	25.00
	100	50	22	44	41.67
							200	50	31	62	60.42
	400	50	42	84	83.33
						Prescription two	25	50	8	16	12.50
	50	50	23	46	43.75
							100	50	29	58	56.25
	200	50	34	68	66.67

	Concentration (mg/L)	Examination borer population (head)	Death toll (head)	Lethality (%)	Corrected mortality (%)
							400	50	49	98	97.92
Prescription three	25	50	11	22	18.75
							50	50	23	46	43.75
	100	50	30	60	58.33
							200	50	42	84	83.33
	400	50	50	100	100.00
						Prescription four	25	50	12	24	20.83
	50	50	19	38	35.42
							100	50	28	56	54.17
	200	50	39	78	77.08
							400	50	49	98	97.92
Prescription five	25	50	9	18	14.58
							50	50	19	38	35.42
	100	50	27	54	52.08
							200	50	32	64	62.50
	400	50	49	98	97.92

Each processing of table 2 is to the biologically active statistics of brown planthopper

Handle	Equation (y=)	LC 50 (mg/L)	CL 0.95 (mg/L)	Co-toxicity coefficient
					Fluorine worm nitrile	y＝5.1204+1.1237x	0.78	0.49～1.18	/

Handle	Equation (y=)	LC 50 (mg/L)	CL 0.95 (mg/L)	Co-toxicity coefficient
					Rogor	y＝-0.4665+2.1854x	317.23	258.98～394.65	/
Prescription one	y＝0.9931+1.7132x	129.37	102.67～169.46	246.9
					Prescription two	y＝0.1248+2.2091x	80.25	62.92～99.49	400.7
Prescription three	y＝0.2189+2.3298x	65.76	51.10～80.57	499.0
					Prescription four	y＝0.5016+2.3565x	75.12	58.73～92.73	442.9
Prescription five	y＝0.2046+2.2999x	89.89	71.29～111.78	375.4

Measurement result shows, five prescriptions all greater than 100, have obvious synergistic effect to the co-toxicity coefficient of brown planthopper nymph, wherein is up to 499.0 with three the co-toxicity coefficient of filling a prescription, and it is 442.9 that prescription four takes second place.Consider that from the lasting effect of reagent cost and medicament prescription three is as preferred.

Test example 2:

Carry out field control effectiveness test to striped rice borer early rice Tanaka, paddy rice is in late tillering state during test, and striped rice borer was the 2nd larva hatching Sheng phase in generation.Every mu of medication of 30% fluorine worm nitrile dimethoate emulsifiable concentrate (prescription three) 100 grams, every mu of medication of 5% fluorine worm nitrile suspending agent (Bayer Cropscience N.V.'s production) 40 grams, every mu of medication of 40% dimethoate emulsifiable concentrate (Qingfeng Agrochemical Co., Ltd's production) 100 grams, every mu of medication of 31% fluorine nitrile azoles phosphorus microemulsion (Zhejiang Xinnong Chemical Co.,Ltd's production) 60 grams, every mu of medication of 20% triazophos emulsifiable solution (Zhejiang Xinnong Chemical Co.,Ltd's production) 100 grams and clear water contrast, totally 6 processing, every processing repeats 3 times.Random sampling 50 clumps of paddy rice in every sub-district before the medicine, the borer population alive of investigation Chilo spp larvae.50 clumps of paddy rice of every sub-district random sampling in 5 days behind the medicine, the borer population alive of investigation Chilo spp larvae and dead borer population, tiller number and the withered calculation of 200 clumps of paddy rice of investigation in 16 days calculate withered heart rate of larval mortality, paddy rice and the seedling protecting effect that each is handled respectively behind the medicine.Field control effect to rice-stem borer is as shown in table 3:

Composite dose of control of table 3 30% fluorine worm nitrile Rogor striped rice borer effect

Handle	Mu dosage (g)	Worm amount (head/clump) before the medicine	Worm amount (head/clump) behind the medicine	Lethality (%)	Proofread and correct preventive effect (%)	Withered heart rate (%)	Seedling protecting effect (%)
								Composite dose of 30% fluorine worm nitrile Rogor	100	2.57	0.24	90.66	89.64	0.36	94.38
5% fluorine worm nitrile suspending agent	40	2.92	0.17	94.18	93.54	0.43	93.28

Handle	Mu dosage (g)	Worm amount (head/clump) before the medicine	Worm amount (head/clump) behind the medicine	Lethality (%)	Proofread and correct preventive effect (%)	Withered heart rate (%)	Seedling protecting effect (%)
								40% dimethoate emulsifiable concentrate	100	3.53	1.26	64.31	60.42	2.9	54.69
31% fluorine nitrile azoles phosphorus microemulsion	60	3.33	0.75	77.48	75.03	1.97	69.22
								20% triazophos emulsifiable solution	100	2.64	0.73	72.35	69.34	2.1	67.19
The clear water contrast	/	3.26	2.94	9.82	/	6.4	/

By composite dose of 30% fluorine worm nitrile Rogor, 5% fluorine worm nitrile suspending agent, 40% dimethoate emulsifiable concentrate, 31% fluorine nitrile azoles phosphorus microemulsion and 20% triazophos emulsifiable solution are shown that to the field test results of striped rice borer control efficiency 5 days correcting controling effects to larva are respectively 89.64%, 93.54%, 60.42%, 75.03% and 69.34% behind the medicine.16 days seedling protecting effect is respectively 94.38%, 93.28%, 54.69%, 69.22% and 67.19% behind the medicine.Explanation is all best with 30% fluorine worm nitrile Rogor composite dose 100 gram treatment region and 5% fluorine worm nitrile suspending agent, 40 gram treatment regions to larva control efficiency and the seedling protecting effect of striped rice borer, and both do not have significant difference and 40% dimethoate emulsifiable concentrate, 20% triazophos emulsifiable solution, 31% fluorine nitrile azoles phosphorus microemulsion difference are shown significantly.Observing the above-mentioned medicament of respectively handling continuously through duration of test does not all have obvious influence to rice growth, and the treatment region later stage heading that fluorine worm nitrile Rogor is composite dose is neat.

Replace prescription three respectively by prescription one, prescription two, prescription four, prescription five and carry out above-mentioned test, basically identical as a result.

Test example 3:

Control efficiency test to brown planthopper was carried out at suburb, the Hangzhou double cropping late rice booting initial stage, and the nymph during test more than 95% is in 2-3 age.Every sub-district area is 30m ², establish 5 pesticide-treated and contrast every processing repetition 3 times with clear water.1 day and 5 days are with basin bat method investigation worm amount before the medicine, behind the medicine.

The effect of composite dose of control of table 430% fluorine worm nitrile Rogor brown planthopper

Field test results shows (table 4): but composite dose of 1 day 30% fluorine worm nitrile Rogor, 5% fluorine worm nitrile suspending agent, 40% dimethoate emulsifiable concentrate, 31% fluorine nitrile azoles phosphorus microemulsion and 25% buprofezin wet-milling are respectively 93.19%, 82.26%, 85.45%, 84.53% and 52.97% to the correcting controling effect of brown planthopper behind the medicine; The correcting controling effect of 5 days each treatment regions is respectively 97.33%, 93.19%, 78.76%, 82.40% and 88.44% behind the medicine.But illustrate composite dose of 30% fluorine worm nitrile Rogor to the quick-acting of brown planthopper apparently higher than 5% fluorine worm nitrile suspending agent, 40% dimethoate emulsifiable concentrate, 31% fluorine nitrile azoles phosphorus microemulsion and 25% buprofezin wet-milling, but also can improve fluorine worm nitrile and Rogor control efficiency to brown planthopper.

Replace prescription three respectively by prescription one, prescription two, prescription four, prescription five and carry out above-mentioned test, basically identical as a result.

Test example 4:

The test of the control efficiency of small brown rice planthopper was carried out in Long You county double cropping late rice Sheng phase of tillering, and the nymph during test more than 87.5% is in 2-3 age.Every sub-district area is 30m ², establish 5 pesticide-treated and contrast every processing repetition 3 times with clear water.1 day and 5 days are with basin bat method investigation worm amount before the medicine, behind the medicine.

The effect of composite dose of control of table 5 30% fluorine worm nitrile Rogor small brown rice planthopper

Field test results (table 5) is identical with test example 3, and composite dose of 30% fluorine worm nitrile Rogor apparently higher than 5% fluorine worm nitrile suspending agent, but also can improve fluorine worm nitrile and the Rogor control efficiency to small brown rice planthopper to the quick-acting of small brown rice planthopper.

Replace prescription three respectively by prescription one, prescription two, prescription four, prescription five and carry out above-mentioned test, basically identical as a result.

Test example 5:

Make composite dose of field control effect of 30% fluorine worm nitrile Rogor by oneself and carry out in single cropping rice field, suburb, Hangzhou to rice leaf roller, the single cropping rice during late tillering state 1-2 instar larvae account for 84%, other is the 3-4 instar larvae.Every sub-district area is 30m ², establish 5 pesticide-treated and contrast every processing repetition 3 times with clear water.Workers and peasants-12 type manual sprayer, spray sheet aperture is 1.2mm, water consumption is a 30kg/ mu.Borer population alive before the medicine, behind the medicine in 3 days and 100 worm buds of 5 days every sub-district random searchings.Handle medicament and be respectively composite dose of 30% fluorine worm nitrile Rogor, 5% fluorine worm nitrile suspending agent, 40% dimethoate emulsifiable concentrate, 31% fluorine nitrile azoles phosphorus microemulsion and 40% chlorpyrifos ec, and be blank with the clear water, its result of the test sees Table 6.

The result shows: composite dose 100 in 30% fluorine worm nitrile Rogor gram was handled behind medicine 3 days and 5 days control efficiency to rice leaf roller are only second to 31% fluorine nitrile azoles phosphorus microemulsion, there is not significant difference between the two, 5% fluorine worm nitrile suspending agent mu takes second place with the control efficiency of 40 gram treatment regions, and is the poorest with 100 gram treatment regions with 40% dimethoate emulsifiable concentrate mu.As seen, composite dose of fluorine worm nitrile Rogor also has good control efficiency to rice leaf roller.

The field test effect of composite dose of control of table 6 30% fluorine worm nitrile Rogor rice leaf roller

Single with every mu of medication of 5% fluorine worm nitrile suspending agent 40 grams, pesticide cost is 7.2 yuan.If in composite dose of every mu of medication of 30% fluorine worm nitrile Rogor 100 grams, descend 40% with cost than single mu with fluorine worm nitrile.

Replace prescription three respectively by prescription one, prescription two, prescription four, prescription five and carry out above-mentioned test, basically identical as a result.

Claims (1)

1. insecticides of preventing and treating rice grub is characterized in that containing the component of following weight percent: fluorine worm nitrile 0.2～1.8%, Rogor 28～30%.