JPH0637363B2 - Pest control method by communication disruption - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for controlling pests by using sex pheromones to disturb the communication of pests.

[Conventional technology and its problems]

Pest control by the communication disruption method using sex pheromones
It has been tried against many pests such as cotton boll beetle, chachamaki, and pear squid, and has been effective to some extent. When this method is used in a wide field of 100 hectares or more, there is no problem, but when it is used in a relatively small field, some problems are raised. One of them is the influence of the wind. Generally, in a windy field, the effect is poor at the boundary surface. This seems to be due to the fact that sufficient pheromone concentration cannot be maintained in the peripheral area. As a countermeasure against these problems, it is known that many pheromone sources (dispensers) are installed in the peripheral portion, and it is generally performed. However, as an even bigger problem, in the surrounding fields where the pheromone was installed, the phenomenon that the concentration of harmful insects increased was recognized, and countermeasures against it became necessary.

[Means to solve the problem and its action]

As a result of various studies in view of these points, the present inventors did not use only sex pheromones having an attracting property to cause pest communication confusion, but a component that constitutes a sex pheromone that is not recognized as attracting properties. I found a way to utilize some of the. That is, a remarkable effect can be obtained by positively adding a precursor substance or a substance that inhibits the attraction of the sex pheromone.

The pest control method by mating disruption according to the present invention, which is made based on such findings, is to diffuse a sex pheromone composition in which a sex pheromone precursor substance or an attraction inhibitor is mixed with the sex pheromone.

This will be described in detail below.

The precursor substance for sex pheromone used in the control method of the present invention is usually present in the secretory glands of female insects, and it undergoes reactions such as esterification, oxidation or dehydrogenation by enzymes to become sex pheromone substances. , Released into the atmosphere. As a precursor substance, when the sex pheromone is an unsaturated aliphatic acetate, it is well known that an unsaturated aliphatic alcohol produced by saponifying the same acetate or a hydrogenated saturated aliphatic alcohol. ing. Further, when an unsaturated aliphatic aldehyde is used as a sex pheromone, an unsaturated aliphatic alcohol produced by reducing it or an acetate thereof is known as a precursor substance. When these sex pheromone precursor substances are used together with sex pheromones to test their attractive activity against males, they often act as attractant inhibitors. Even if it does not act as a complete attractant inhibitor, it often affects the attractive activity.

The sex pheromone attraction inhibitor, which is another substance used in the control method of the present invention, is often the same as the aforementioned sex pheromone precursor substance. However, it may not be known as a precursor substance for sex pheromones. Whether the sex pheromone is an acetate type or an aldehyde type as described above, an unsaturated aliphatic alcohol is also well known as an attraction inhibitor. These sex pheromone precursors and attractants are
When 0.5 to 20% is added and communication disruption is performed using this,
It is possible to obtain a superior effect as compared with the case where the sex pheromone is used alone.

In the case of alcohols, which is a typical example, the details thereof will be described below with respect to Chacococca esculenta. The component of the sex pheromone of Pleurotus cornucopsis is Z-11.
-Tetradecenyl acetate (Z-11-TDA) 31%, Z-9-TDA
63%, E-11-TDA 4%, 10-methyldodecyl acetate (10
-MeDDA) 2%. It is known that when this composition is used as a communication disrupting agent, problems occur in the peripheral area. Therefore, the corresponding Z-11-tetradecenyl alcohol (Z-11-TDOL), Z-9-tetradecenyl alcohol (Z-
9-TDOL) was added to 0.5 to 20%, it was known that the problem in the peripheral area was also solved. As the amount of alcohol added, 0.
If it is less than 5%, there is no addition effect. It was known that at 20% or more, the effect of addition was not strengthened, and the mating inhibitory effect in the central part also decreased, probably because the active ingredient decreased. The most preferable addition amount is 0.8-10%. It is not always clear whether this effect is due to the attracting inhibitor or affecting the mating inhibiting effect of alcohols.

Although alcohol varies depending on the target pest, in the case of Chahamaki, Z-11-TDOL, Z-9-DDOL or Z-11-dodecenyl alcohol (11-DDOL), and a mixture thereof are sex pheromone. When 0.5 to 20% is added and used, the same effect is obtained. Similarly, ZZ / ZE-7,11-
Hexadecadienyl alcohol (ZZ / ZE-7,11-HDDOL) is suitable. Also suitable for diamondback moth is Z-11-hexadecenyl alcohol (Z-11-HDOL) or Z-9-TDOL, and mixtures thereof.

When using the sex pheromone composition as a mating disruptant,
It is necessary to control and diffuse this, and to continuously diffuse in the field for a long period of time. Examples of the material and form of the emission control preparation include a thin tube wrapped with a plastic film such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, vinyl chloride, a bag made of a laminated film, a capsule and the like.

〔The invention's effect〕

According to the pest control method by mating disruption of the present invention, since the sex pheromone composition is diffused by blending the sex pheromone with the precursor substance or the attraction inhibitor of the sex pheromone, the sex pheromone can be compared with the case of the field alone. The pest concentration in the peripheral area is surely reduced. Not only that, but it also has a strong mating-inhibiting effect, so that pest control can be performed more effectively.

〔Example〕

Each embodiment of the present invention will be described in detail below. However, the invention is not limited to these examples.

Example 1 Table 1 shows the results of measurement of the argument and the mating rate in the central part of the field when 1% by weight of the corresponding sex pheromone of Pleurotus cornucopiae was added to the sex pheromone. The area of the tested field was 20 ares, and the dispenser was uniformly placed on 600 tea trees to disperse the sex pheromone composition. The dispenser is made of polyethylene and contains 40 mg of AI (Active Ingredient). The active ingredient is sex pheromone and alcohol added to it.

In Comparative Example 1, the same measurement is performed in a field where only the sex pheromone is installed and diffused, and in Comparative Example 2 where the sex pheromone is not installed at all.

As a result, as shown in Table 1, in the field according to Example 1, the number of arguments to the peripheral trap is reduced, the mating rate in the central part is also reduced, and the peripheral field is not adversely affected.
An excellent control effect due to the disruption of sex pheromone communication was observed.

In addition, for the measurement of the attracting argument, the number of trapped animals is checked by traps installed around the field. The copulation rate is measured by tying the wings of a virgin female with a thin thread and connecting them, placing them in the center of the field so as not to escape, and measuring the copulation rate of the female.

Examples 2 to 5 For the communication disturbance test of Chahamaki, for the purpose of testing insects coming into the surrounding area, a polyethylene dispenser was filled with 50 mg of each sex pheromone composition shown in Table 2 in a field of 10 ares, and 300 Book set up. The test results are also shown in Table 2. The natural component in the sex pheromone composition is Z-11-TDA 88%, Z-9-dodecenyl acetate (Z-9-D
DA) 9%, 11-dodecenyl acetate (11-DDA) 3%. Comparative Example 3 is a field in which only natural components are diffused, and Comparative Example 4 is a field in which no sex pheromone is diffused.

Examples 6 to 7 Using the 10 ares of cabbage field 4 wards, the contact disturbance test of diamondback moth was conducted. The natural component is a mixture of 50% Z-11-hexadecenyl aldehyde (Z-11-HDAL) and 50% Z-11-hexadecenyl acetate (Z-11-HDA). Comparative Example 5
Is a field in which only natural components were diffused, and Comparative Example 6 is a field in which no sex pheromone was diffused. The pheromone dispenser was set up by placing a polyethylene dispenser containing AI 2.5 g and having a length of 10 m at a position 30 cm above the cabbage plant.

Examples 8 and 9 Cotton fields were divided into 5 wards each containing 10 ares, and a contact disturbance test of the cotton boll beetle was conducted as follows. ZZ / ZE-7,11-hexadecadienyl acetate (HDDA), the sex pheromone of the cotton bollworm, and ZZ / ZE-7,11, a precursor substance.
-Hexadecadienyl alcohol (HDDOL) and the composition shown in Table 4 were filled in the dispenser. This dispenser filled with sex pheromone, etc.
It was placed in a polyethylene tube of 0.8 mm, outer diameter 1.6 mm, and length 200 mm, and the dispenser was tied to a cotton stalk so that 30 dispensers were placed every 10 ares, and the polyethylene tube was tied to the cotton stem. In the same manner, the mating rate by the females of tie was measured. The results are shown in Table 4.

It was found that the addition of 5 or 17 parts by weight of the precursor substance significantly reduced the mating rate of the cotton bollworm and had an excellent effect on the mating disruption of the sex pheromone.

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Claims (5)

[Claims] 1. Z-11-tetradecenyl acetate, Z-9-tetradecenyl acetate, E-11-tetradecenyl acetate, 10-methyldodecyl acetate, Z-9-dodecenyl acetate. , 11-dodecenyl acetate, Z-11-hexadecenyl aldehyde, Z-11-hexadecenyl acetate, ZZ / ZE-7,11-hexadecadienyl acetate. 100 parts by weight of sex pheromone, Z-9-tetradecenyl alcohol, Z-11-hexadecenyl alcohol, Z-11-tetradecenyl alcohol, Z-9-tetradecenyl alcohol, Z-9 -Dodecenyl alcohol, 11-dodecenyl alcohol, tetradecanol, ZZ / ZE-7,11-
A pest caused by communication disruption, characterized in that a sex pheromone composition containing 0.5 to 20 parts by weight of a precursor substance or an attraction inhibitor of the sex pheromone consisting of one or more alcohols selected from hexadecadienyl alcohol is released. Control method. 2. The method for controlling pests by communication disruption according to claim 1, wherein the alcohol is Z-11-tetradecenyl alcohol, Z-9-dodecenyl alcohol,
A method for controlling Chahamaki, which is a mixture of 1 or 2 or more selected from 11-dodecenyl alcohol and tetradecanol. 3. The pest control method according to claim 1, wherein the alcohol is ZZ / ZE-7,
A method for controlling cotton bollworm, which is 11-hexadecadienyl alcohol. 4. The method for controlling pests by communication disruption according to claim 1, wherein the alcohol is Z-11-tetradecenyl alcohol or Z-9-tetradecenyl alcohol. Method. 5. The pest control method according to claim 1, wherein the alcohol is Z-11-hexadecenyl alcohol or Z-9-tetradecenyl alcohol, and a mixture thereof. How to control the diamondback moth.