CN113142206B

CN113142206B - Fruit fly attractant and controlled release system and application thereof

Info

Publication number: CN113142206B
Application number: CN202110337125.3A
Authority: CN
Inventors: 郭磊; 沈志军; 宋宏峰; 张黎; 火金琍; 齐玉洁; 高爱华; 蔡志翔; 严娟
Original assignee: Nanjing Xinan Sinogreen Biological Technology Co ltd; Jiangsu Academy of Agricultural Sciences
Current assignee: Nanjing Xinan Sinogreen Biological Technology Co ltd; Jiangsu Academy of Agricultural Sciences
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2022-02-22
Anticipated expiration: 2041-03-29
Also published as: CN113142206A

Abstract

The invention discloses the application of cinnamyl cinnamate serving as a fruit fly attractant for the first time. The cinnamic acid cinnamyl ester has an attracting effect and an obvious attracting effect on the fruit flies, so that the fruit flies can be accurately attracted and intensively killed, the field population quantity is reduced, and the cinnamic acid cinnamyl ester is used for controlling the fruit flies, monitoring the insect situations and the like. The invention has no harm to beneficial insects, human and livestock, crops and natural enemies, has no resistance to target pests, and has the advantages of naturalness, environmental protection and the like.

Description

Fruit fly attractant and controlled release system and application thereof

Technical Field

The invention relates to the technical field of agricultural pest control, in particular to a fruit fly attractant and a controlled release system and application thereof.

Background

The background of the related art of the present invention will be described below, but the description does not necessarily constitute the prior art of the present invention.

Trypetidae (Tephritidae) is a generic name for the family Papilionaceae of the order Diptera. There are about 4000 species of fruit flies all over the world, which are almost ubiquitous throughout the world. The trypetid body is in a medium-small shape, the head is spherical, the middle chest is developed, and the wings have variegated spots. Fruit flies are phytophagous insects and there are many kinds of pests belonging to crops, among which fruit-damaging species are, for example, citrus fruit flies, melon fruit flies, citrus fruit flies, pumpkin fruit flies, mediterranean fruit flies, apple fruit flies, cherry fruit flies, and the like. The female adults lay eggs on the subcutaneous surface of the fruit of the host plant by using the tail needle, the larvae eat the pulp in the fruit, and the eggs and the larvae are easy to spread and spread for a long distance along with the transportation of the fruit. Most kinds of fruit flies also have strong flying capability, can fly, propagate and spread for a long distance, are internationally recognized dangerous pests, and are also listed as important quarantine objects in China.

In the prior art, the most commonly used measure for preventing and killing fruit flies is to adopt chemical drugs such as cyfluthrin, imidacloprid, thiamethoxam and the like, but the drugs have certain limitations in use due to the problems of drug resistance, safety, lasting effect and the like. And because the fruit flies are fast to propagate, the population base number is large, the egg falling amount is large, and a plurality of medicaments can not prevent the pests from invading for a long time. In addition, the long-term frequent use of the same type of insecticide and the excessive dependence on broad-spectrum chemical agents will increase the selective pressure of the insecticide, reducing the effectiveness of the drug. Therefore, it is difficult to completely control the damage of such pests to fruit trees by chemical control.

Based on this, there is an urgent need for an attractant or an attracting method or an attracting device capable of replacing chemical drugs and controlling fruit flies, so as to reduce the harm to vegetables and fruits such as oranges, mangos, pears, apples, peaches, cucumbers, peppers, tomatoes, pumpkins, and the like.

Disclosure of Invention

The invention aims to provide a fruit fly attractant, a controlled release system and application thereof, which are used for preventing and controlling fruit flies.

The inventor unexpectedly finds that cinnamyl cinnamate has a strong attraction effect on fruit flies and can be used as an attractant for the fruit flies to control the fruit flies in long-term research.

The structure of cinnamyl cinnamate (cinnamyl cinnamate) is as follows:

according to a first aspect of the present invention there is provided any one of the following uses of cinnamyl cinnamate: 1) as an attractant for fruit flies; 2) is used for attracting fruit flies.

According to a second aspect of the present invention, there is provided a controlled release system for attracting fruit flies, the controlled release system being: a controlled release device containing cinnamyl cinnamate or a controlled release device containing a mixture of cinnamyl cinnamate and an oil.

Preferably, the controlled release device containing cinnamyl cinnamate or the controlled release device containing a mixture of cinnamyl cinnamate and an oil is any one of: controlled release strip, controlled release bag, controlled release tube, controlled release capsule or controlled release bottle.

Preferably, the material of the controlled release strip, the controlled release bag, the controlled release tube, the controlled release capsule or the controlled release bottle is selected from any one of the following: polyethylene, polyvinyl chloride, low density polyethylene, ethylene-vinyl acetate, thermoplastic polyurethane, polyethylene terephthalate.

Preferably, the controlled release device containing cinnamyl cinnamate or the controlled release device containing a mixture of cinnamyl cinnamate and an oil material is sponge, rayon, rattan, wood chips, rubber particles.

Preferably, the controlled release system is obtained by mixing cinnamyl cinnamate and oil according to the weight ratio of 1: 50-1: 1, and then filling the mixture into a controlled release strip, a controlled release bag, a controlled release tube, a controlled release capsule or a controlled release bottle.

Preferably, the oil is selected from at least one of the following: glycerol, soybean oil, linseed oil, mineral oil and sesame oil.

Preferably, in the cinnamyl cinnamate and oil mixture, the weight ratio of the cinnamyl cinnamate to the oil is 1: 50-1: 1.

According to another aspect of the present invention, the present invention also provides the use of the aforementioned controlled release system in trypetid trapping.

According to still another aspect of the present invention, there is provided a method for controlling fruit flies, comprising placing the aforementioned controlled release system in an insect trapping device, placing the device in the field, inducing the fruit flies to gather and perform collective killing.

According to the technical scheme, the beneficial technical effects of the invention are at least as follows:

the invention discloses the application of cinnamyl cinnamate serving as a fruit fly attractant for the first time. The cinnamic acid cinnamyl ester has an attracting effect on the fruit flies in the field, and has an obvious attracting effect, so that the fruit flies can be accurately attracted and intensively killed, the field population quantity is reduced, and the cinnamic acid cinnamyl ester can be used for controlling the fruit flies, monitoring the insect situations and the like. The invention has no harm to beneficial insects, human and livestock, crops and natural enemies, has no resistance to target pests, and has the advantages of naturalness, environmental protection and the like.

Detailed Description

The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. The technical means employed in the examples are conventional means well known to those skilled in the art, and the starting materials used are all commercially available products, if not otherwise specified.

In the following description, unless otherwise specified, the fruit fly refers to a general abbreviation of a plurality of fruit flies such as bactrocera dorsalis, bactrocera minax, bactrocera cucurbitae, bactrocera minax, bactrocera malus, and bactrocera chervilensis.

Example 1 testing of the attraction of cinnamyl cinnamate to fruit flies

1. Attractive action of cinnamyl cinnamate on fruit fly

Yellow trap buckets were selected as a means of screening a series of candidate attractant compounds for fruit flies, wherein the candidate attractant compounds are shown in table 1:

TABLE 1 attractant candidate compounds for fruit flies

Cortex CinnamomiAcid cinnamyl ester
	3, 5-Dimethoxytoluene
Myristicin
	3, 4, 5-trimethoxytoluene
Terpineol
	P-methoxy propiophenone
Cadinenes
	Eucommia ulmoides Oliver ketone

The specific experimental design is as follows: the compounds in table 1 were each used as attractants and glycerin mixed in a 1:1 weight ratio and heat sealed in PE (polyethylene) controlled release strips. Glycerol was purchased from Macro-State chemical Co., Ltd, Guangzhou. The PE controlled release strip is purchased from Shenzhen Ming san Huai rubber tube Co. For example, the PE controlled release strip may be 70 mm long by 27 mm wide, have a cavity wall thickness of 0.8 mm, and have a practical fillable volume of about 1ml, i.e., a capacity of about 1.3 grams, in the tube after heat sealing. Thus, each PE controlled release strip tested contained approximately 0.65 grams of one of the test compounds in table 1. The control was an equivalent PE controlled release strip containing only the same amount of glycerol, i.e., about 1.3 grams.

The first screening test is carried out in peach garden and melon garden in certain vegetable and fruit base in Ling Chuan county of Guangxi province in 6 months, and fruits and vegetables such as cucumbers, pumpkins and the like are planted in the melon garden.

1.1 attraction test for Bactrocera dorsalis in peach orchard

In the test peach orchard, the aforementioned fruit fly trapping buckets with the PE controlled release strips for test were hung on peach trees at intervals of 5 meters. Each treatment was repeated 5 times, and after suspending for 7 days, the trapping barrels were checked for the presence of fruit flies, and the number and the type of flies present were counted and averaged, with the results shown in table 2:

TABLE 2 test results of the use of candidate compounds as attractants in peach orchard with fruit fly trap

The experimental results in table 2 show that cinnamyl cinnamate has a strong attraction effect on bactrocera dorsalis, and 162.7 bactrocera dorsalis trapping barrels trap on average. Other candidate compounds, i.e., 3, 5-dimethoxytoluene, myristyl ether, 3, 4, 5-trimethoxytoluene, p-methoxypropiophenone, and eucommia ulmoides ketone, also have some attractant effects on Bactrocera dorsalis. However, terpineol and cadinene have substantially no attracting effect. In addition, some candidate compounds induced some other fruit flies, such as squash fruit flies, in addition to a large number of bactrocera dorsalis in this experiment, and only squash fruit flies are listed in table 2 as examples of other fruit flies.

1.2 attraction test for fruit flies in melon garden

Similar to the design of the aforementioned inducing test of Bactrocera dorsalis Hendel in peach orchard, the inducing effect of the candidate compound on the Bactrocera dorsalis Hendel in melon orchard is tested. At the same time, the aforementioned trypetid trapping buckets with the PE controlled release strips for test were hung on the hedgerow of the garden at 5 m intervals in the test garden. Each treatment was repeated 5 times, and after suspending for 7 days, the trapping barrels were checked for the presence of fruit flies, and the number and the type of flies present were counted and averaged, with the results shown in table 3:

TABLE 3 test results of the use of candidate compounds as attractants in melon gardens in combination with fruit fly trapping buckets

The experimental results of table 3 show that: cinnamic acid cinnamyl cinnamate has strong attraction to Bactrocera micrantha, fructus Cucurbitae moschatae fly and fructus Cucumidis Sativi fly, as shown in the table, one fruit fly trapping barrel using cinnamic acid cinnamyl cinnamate as attractant on average traps 48.2 Bactrocera micrantha, traps 62 fructus Cucurbitae moschatae flies and traps 78 fructus Cucumidis Sativi flies. Other candidate compounds, i.e., 3, 5-dimethoxytoluene, myristyl ether, 3, 4, 5-trimethoxytoluene, and eucommia ulmoides ketone, also have some attractant effects on these fruit flies. However, terpineol, p-methoxypropiophenone, and cadinene have substantially no attractant effect.

The two previous experiments show that cinnamyl cinnamate serving as an attractant has a stronger attraction effect on fruit flies compared with other compounds and can serve as a fruit fly attraction component.

2. Testing the attraction effect of different materials of controlled release devices

In the foregoing test, a PE controlled release strip was used as the controlled release means, but in addition to the PE controlled release strip, a controlled release means in the form of a controlled release strip, a controlled release bag, a controlled release tube, a controlled release capsule, or a controlled release bottle, for example, made of PVC (polyvinyl chloride), LDPE (low density polyethylene), EVA (ethylene vinyl acetate), TPU (thermoplastic polyurethane), PET (polyethylene terephthalate), or the like may be used. In addition, sponge, rayon (cotton sliver), cane, and wood chips can also be used as controlled release device, and usually, the wood chips are compressed into blocks for use. When the controlled release devices are used, the volatile matter containing cinnamyl cinnamate is generally dripped on the controlled release devices or is directly soaked to slowly volatilize and release the volatile matter so as to achieve the purpose of attraction.

The attraction effect of controlled release devices using different materials was tested in the same manner as the design of the previous experiments. Namely, the cinnamyl cinnamate solution is respectively heat sealed in a controlled release device made of PE, PVC, LDPE, EVA, TPU, PET and the like, or directly dripped on a controlled release device made of sponge, rattan and the like, and each carrier contains 1.3g of cinnamyl cinnamate.

The test was conducted in 6 months in a peach orchard in Lingchuan county, Guangxi province, in which the aforementioned sustained-release devices made of various materials were placed in a fruit fly trapping bucket and hung on peach trees at intervals of 5 meters, respectively. Each treatment was repeated 5 times, every 7 days after hanging, to see if there were fruit flies in the trapping barrel, and to count the number of flies present, take the average, count every time and empty the trapping barrel, the results are shown in table 4:

TABLE 4 attractant effect on fruit flies by attractants released by different controlled-release devices

The test results in the table 3 show that the PE controlled release device can be used as a slow release carrier to effectively and slowly release cinnamyl cinnamate to lure fruit flies for a long time. The slow release carrier prepared from EVA, TPU, sponge and rattan has strong capability of inducing the fruit flies in a short time but slightly short duration, and can only take effect for about 7-14 days. In addition, the controlled release device made of PVC, LDPE and other materials can continuously and slowly release cinnamyl cinnamate, but the attraction effect is low. Compared with other materials, the controlled release device made of PET has obviously poorer slow release capability. Thus, a controlled release device of PE material is the most preferred controlled release device for long-acting sustained release. While EVA, TPU, sponge and rattan may be the most preferred controlled release devices for the short term. As mentioned previously, the controlled release device in the above test may be in the form of a controlled release tube, a controlled release capsule, a controlled release bag, a controlled release bottle, a controlled release strip, etc.

3. Test the luring effect of cinnamyl cinnamate mixed with different oil materials on fruit flies

In the aforementioned experiments, cinnamic acid cinnamate was mixed with glycerin to have a strong attracting effect on fruit flies. In addition, the inventors have also experimentally demonstrated that cinnamyl cinnamate, in addition to glycerol, can also be mixed with other oils as an attractant for fruit flies.

The experimental design was as follows: the cinnamic acid cinnamyl ester is respectively mixed with soybean oil, linseed oil, mineral oil, sesame oil and other oil with smaller smell according to the weight ratio of 1:1 to be respectively used as fruit fly attractants, wherein the mineral oil is obtained from Zhejiang Zhenjin Petroleum oil science and technology Limited, and the other oil is purchased from Shanghai Huiyi grain and oil development Limited. The test is still carried out in the peach orchard of the melon orchard, and the controlled release device used in the test is also a PE controlled release strip with the same volume, namely the actual fillable volume in the rubber strip after heat sealing is about 1ml, and the volume is about 1.3 g. The fruit fly trapping buckets with the PE controlled release strips for the test were hung on the peach trees at intervals of 5 meters, respectively. Each treatment was repeated 5 times, and after suspending for 7 days, the trapping buckets were checked for the presence of fruit flies and the number present was counted and averaged, with the results shown in table 5:

TABLE 5 attraction effect of cinnamyl cinnamate as attractant for fruit fly after mixing with different oils

Mixed oil	Fruit fly/a fruit fly trapping barrel (only)
		Glycerol	186.2
Soybean oil	139.6
		Linseed oil	99.2
Mineral oil	135.4
		Sesame oil	82.1

The test results in table 5 show that cinnamyl cinnamate can be mixed with the oil plants to be used as an attractant for attracting fruit flies, and the attraction effect is good. But glycerol can be the most preferred example.

4. Testing the luring effect of cinnamyl cinnamate mixed solutions with different concentrations on fruit flies

The previous experiments prove that the cinnamic acid cinnamyl ester and the glycerol have stronger attraction effect on the fruit flies after being mixed according to the weight ratio of 1: 1. Mixtures of cinnamic acid cinnamate and glycerol at different concentrations are now tested for their attractive effect on fruit flies. Cinnamic acid cinnamyl ester and glycerin were mixed at a weight ratio of 1: 10, 1:20, 1: 30, 1: 40, 1: 50, 1: 60, 1: 70, respectively, and heat-sealed using the same PE controlled release strip as in the previous test, and the internal volume after heat-sealing was about 1ml, i.e., the capacity was about 1.3 g. The control contained only 1.3 grams of glycerol.

The test was conducted in 6 months in a peach orchard of Lingchuan county, Guangxi province, and the fruit fly trapping buckets with the PE controlled-release strips for the test and the control PE controlled-release strips were hung on peach trees at intervals of 5 meters, respectively. Each treatment was repeated 5 times, and after suspending for 7 days, the trapping buckets were checked for the presence of fruit flies and the number present was counted and averaged, with the results shown in table 6:

TABLE 6 attraction effect of cinnamic acid cinnamyl ester mixed solution with different concentrations on fruit fly

The test results in Table 6 show that the cinnamic acid cinnamyl ester mixed solution has the attraction capacity on the fruit flies equivalent to that of the control when the concentration is as low as 1: 60, namely, the cinnamic acid cinnamyl ester mixed solution has almost no attraction capacity on the fruit flies at the concentration. When the concentration of the cinnamyl cinnamate mixed solution is equal to or higher than 1:20, the luring capability of the cinnamyl cinnamate mixed solution to the fruit flies is strongest, and the luring capability of the cinnamyl cinnamate mixed solution is increased along with the increase of the concentration, but the extent of the increase is not large. In view of the cost of raw materials and the relatively stable luring ability to fruit flies, a mixed solution concentration of cinnamyl cinnamate to oil in a weight ratio of 1:20 may be used as the most preferable mixing ratio.

5. Further testing the persistence of cinnamyl cinnamate through a PE controlled release strip controlled release device

As mentioned above, the PE controlled release strip can be used as a controlled release device and can last for 28 days. In addition, the inventor further verifies the longer lasting effect attraction effect of the cinnamyl cinnamate through the PE controlled release strip controlled release device through experiments.

In the test, 20 PE controlled release strips each having a volume of 1ml and a density of 1.156g/cm3 were exposed to room temperature, and thus each PE controlled release strip contained 1.156g of cinnamyl cinnamate and was weighed every month to the nearest 0.001 g within 180 days, and averaged, and the release data are shown in table 7:

table 7 release of cinnamyl cinnamate as an attractant (room temperature) by PE controlled release strip

Time/day of exposure	Cumulative amount released/g
		30	0.129
60	0.376
		90	0.520
120	0.793
		150	0.971
180	1.151

The results of the tests in table 7 show that cinnamyl cinnamate in the PE controlled release strip is only about to be depleted in about 180 days. Therefore, the cinnamic acid cinnamyl ester can realize long-term persistence of up to 180 days through the PE controlled release strip controlled release device, and is particularly suitable for being used as a long-acting slow release attractant.

In addition, in addition to the controlled release devices in the form of PE controlled release strips, the inventor team also tested the sustained effects of controlled release devices in other forms such as PE controlled release capsules, PE controlled release bags, PE controlled release tubes, PE controlled release bottles, and the like, and the results were similar to those in table 7 above, thereby indicating that cinnamyl cinnamate can realize a long-acting sustained release function through various types of PE controlled release devices.

6. In-field test of prevention and control effect of cinnamyl cinnamate attractant on fruit fly

During testing, 1ml of mixed solution of cinnamyl cinnamate and glycerol with the weight ratio of 1:20 is encapsulated in 200 PE controlled release strip controlled release devices respectively, and then the mixed solution is divided into two treatment groups, wherein each group comprises 100 PE controlled release strip controlled release devices.

In the first treatment, 100 PE controlled release strip controlled release devices were used. Each controlled release PE strip was placed as a lure in a trypetid trap bucket, also known as a disposal trap bucket, which was illustratively a cylindrical polyethylene container with a screw-on lid having a volume of 2 liters. At the upper part of the container barrel, four circular holes are arranged, each hole has a diameter of 2 cm, so that the fruit flies can enter the holes. An additional 500 ml of water and a drop of detergent were placed in each trap. A PE controlled release strip release device was suspended below a trap inner lid. Selecting 5 rows of peach trees, selecting 20 peach trees in each row, placing one trapping barrel for each peach tree, wherein the arrangement interval of the trapping barrels is 5 meters, and the height of the trees is about 250 centimeters.

In the second treatment, 100 additional controlled release devices of PE controlled release strips were used, each controlled release device of PE controlled release strips was attached as a lure to a yellow armyworm plate. Selecting another 5 rows of peach trees which are at least 20 meters away from the first row in the same orchard, selecting another 20 peach trees in each row, placing one pest sticking plate on each peach tree, arranging the pest sticking plates at intervals of 5 meters, and keeping the height of the trees to be about 250 centimeters.

The control group was set in the same orchard. Specifically, at least 20 meters away from both the first and second treatments, 5 rows were used as controls, and 1 methyl eugenol trap was placed for monitoring the number of bactrocera dorsalis per row of selected 1 peach tree, also referred to as control monitoring traps. Methyl eugenol trapping bottle is purchased from Zhangzhou Yinggler agriculture science and technology limited. The control area is not provided with any controlled release device, and only the control monitoring trap is used for monitoring the number of worm mouths in the area.

Similarly, in the above two treatment areas, namely the treatment trap area using the controlled release device of the PE controlled release strip as the trap core and the treatment area attaching the controlled release device of the PE controlled release strip to the yellow armyworm plate, methyl eugenol monitoring trap bottles were also placed for recording the monitoring data as in the control area, namely, one methyl eugenol trapping bottle was additionally placed in each row for monitoring the number of trypetid flies, which are respectively referred to as the first treatment monitoring trap bottle and the second treatment monitoring trapping bottle. The number of fruit flies in all the control and first and second treatment monitoring luring bottles was counted on days 0, 30, 60, 90, 120, 150, 180 of the treatment, respectively, and the fruit flies were counted mainly because of the majority of fruit flies in the peach orchard. The results are averaged and shown in table 8:

table 8 controlled release PE strips containing cinnamate attractant to monitor bactrocera dorsalis trapping in trapping bottles in field trial-control and treatment areas of peach orchard

The test results in table 8 show that cinnamyl cinnamate as an attractant can be used as a trapping device for fruit flies in peach gardens in cooperation with insect sticking boards and traps. The effect can last for at least 180 days after the use. As shown in table 8, the control monitoring luring bottles did not use the control zones of the attractants of the present invention, the fruit fly luring amount of the control monitoring luring bottles on day 180 could be as high as 214.9 on average, while when the PE controlled release strip controlled release device was applied in cooperation with the trap barrel and the yellow armyworm plate, respectively, the fruit fly luring amount of the first and second treatment monitoring luring bottles on day 180 decreased to 0.2 and 0 on average, because in both treatment zones, most of the fruit flies had been trapped by the trapping device containing cinnamate attractant.

Therefore, the cinnamic acid cinnamyl acetate is used as an attractant to be matched with the trapping barrel and the pest sticking plate, so that the population quantity of the trypetid pests such as bactrocera dorsalis can be reduced, and a certain control effect on the trypetid pests can be realized. That is, the number of bactrocera dorsalis in the trap bottle for monitoring was still at a low level by 180 days after the treatment, far lower than 214.9 in the control group, relative to the control group, the treatment group of the trap tub in which the PE controlled release strip controlled release device was disposed and the treatment group of the yellow armyworm plate in which the PE controlled release strip controlled release device was disposed. Therefore, the cinnamyl cinnamate not only can be used for intensively trapping and killing trypetid and reducing the population quantity of trypetid pests, but also can be used for monitoring and controlling the trypetid pests.

In addition, although the experiment described above was conducted with a controlled release device of PE controlled release strip containing cinnamyl cinnamate in combination with a trap bucket for trapping fruit flies, it is understood that the device can be used in combination with devices or systems other than trap buckets, such as trap bottles, trap bags, and smart signage systems.

Although the invention has been described in greater detail hereinabove using general illustrations and specific examples, it will be apparent to those skilled in the art that modifications or improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A cinnamate controlled release system, characterized in that, the controlled release system is used for luring fruit flies, the controlled release system is: the controlled release device is filled with cinnamyl cinnamate and oil, the material of the controlled release device is polyethylene, the weight ratio of the cinnamyl cinnamate to the oil is 1:20-1:1, and the oil is selected from at least one of the following materials: glycerol, soybean oil, linseed oil, mineral oil and sesame oil.

2. The controlled release system of claim 1, wherein the controlled release device containing cinnamyl cinnamate and oil is any one of: controlled release strip, controlled release bag, controlled release tube, controlled release capsule or controlled release bottle.

3. The controlled release system of claim 1, wherein the controlled release system is obtained by mixing cinnamate with oil in a weight ratio and then filling the mixture into a controlled release strip, a controlled release bag, a controlled release tube, a controlled release capsule, or a controlled release bottle.

4. Use of a controlled release system according to any one of claims 1 to 3 for trapping fruit flies.

5. A method for controlling fruit flies, characterized in that the controlled release system according to any one of claims 1 to 3 is placed in an insect trapping device, placed in the field, attracted to gather and centrally exterminated.