KR-102960773-B1 - SUSTAINED-RELEASE PHEROMONE DISPENSER, AND SIMULTANEOUS CONTROL METHOD FOR COMSTOCK MEALYBUG AND MATSUMOTO MEALYBUG USING THE SAME

Abstract

[Project] The purpose is to provide a pheromone preparation equipped with sex pheromone substances for mealybugs and willow mealybugs, and a method for the simultaneous control of mealybugs and willow mealybugs using the same. [Solution] A method for simultaneous control of mealybugs and willow mealybugs is provided, comprising at least a step of: a mixture comprising, as a sex pheromone substance, 2,6-dimethyl-1,5-heptadiene-3-yl acetate and 3-methyl-3-butenyl 5-methylhexanoate in a mass ratio ranging from 80:20 to 20:80, and a container comprising a polymer material for containing said mixture, a sustained-release pheromone preparation targeting mealybugs and willow mealybugs, and installing said sustained-release pheromone preparation in a package and releasing said mixture of said sustained-release pheromone preparation into said package.

Inventors

• 구츠와다, 야스히코
• 야마시타, 미요시
• 긴쇼, 다케시

Assignees

• 신에쓰 가가꾸 고교 가부시끼가이샤

Dates

Publication Date

20260507

Application Date

20210121

Priority Date

20200124

Claims (3)

1. A sustained-release pheromone preparation targeting mealybugs and willow mealybugs, comprising a mixture comprising, as a sex pheromone substance, at least 2,6-dimethyl-1,5-heptadiene-3-yl acetate and 3-methyl-3-butenyl 5-methylhexanoate in a mass ratio ranging from 80:20 to 20:80, and a container comprising a polymer material for containing said mixture.
2. A sustained-release pheromone formulation according to claim 1, wherein the polymer material is an ethylene-vinyl acetate copolymer or polyethylene.
3. A method for the simultaneous control of mealybugs and willow mealybugs comprising at least the step of installing a sustained-release pheromone preparation described in claim 1 or 2 in a package and releasing the sex pheromone substance in the sustained-release pheromone preparation into the package.

Description

Sustained-Release Pheromone Dispenser and Simultaneous Control Method for Comstock Mealybug and Matsumoto Mealybug Using the Same The present invention relates to a sustained-release pheromone preparation and a method for the simultaneous control of mealybugs and willow mealybugs using the same. Comstock mealybugs (scientific name: Pseudococcuscomstocki ) damage many fruit trees, such as apples, pears, peaches, and grapes. Furthermore, since the excrement of these pests causes sooty mold, the reduction in yield and quality caused by this pest is a major problem. Currently, control of comstock mealybugs is carried out using insecticides, but since the insects' bodies are covered with a waxy substance, the effectiveness is not sufficient. In addition, due to residues in crops from insecticide use and impacts on the environment and health, there is a need for the development of new control technologies, such as mating disruption using sex pheromones or mass trapping. Meanwhile, the willow mealybug (scientific name: Crisicoccusmatsumotoi ) is a major pest of deciduous fruit trees such as pears, persimmons, and grapes, and control of this species is also carried out mainly using insecticides. However, as it often causes resurgence (induced mass outbreak), sufficient effectiveness could not be achieved, just like with mealybugs. In addition, since willow mealybugs and mealybugs often occur in the same location, there is a strong demand for sustained-release pheromone preparations targeting both species. The sex pheromone substances of mealybugs and willow mealybugs have been identified as 2,6-dimethyl-1,5-heptadiene-3-yl acetate and 3-methyl-3-butenyl 5-methylhexanoate, respectively, and methods for their preparation have already been established (Patent Documents 1 to 2). Figure 1 shows the results of the change over time of the mass retention rate of 2,6-dimethyl-1,5-heptadiene-3-yl acetate and the mass retention rate of 3-methyl-3-butenyl 5-methylhexanoate of Example 1. Figure 2 shows the results of the change over time of the mass retention rate of 2,6-dimethyl-1,5-heptadiene-3-yl acetate and the mass retention rate of 3-methyl-3-butenyl 5-methylhexanoate in Example 2. Figure 3 shows the results of the change over time of the mass retention rate of 2,6-dimethyl-1,5-heptadiene-3-yl acetate and the mass retention rate of 3-methyl-3-butenyl 5-methylhexanoate in Example 3. Figure 4 shows the results of the change over time of the mass retention rate of 2,6-dimethyl-1,5-heptadiene-3-yl acetate of Comparative Example 1 and the mass retention rate of 3-methyl-3-butenyl 5-methylhexanoate of Comparative Example 2. Figure 5 shows the results of the change over time of the mass retention rate of 2,6-dimethyl-1,5-heptadiene-3-yl acetate and the mass retention rate of 3-methyl-3-butenyl 5-methylhexanoate of Example 4. Figure 6 shows the results of the change over time of the mass retention rate of 2,6-dimethyl-1,5-heptadiene-3-yl acetate of Comparative Example 3 and the mass retention rate of 3-methyl-3-butenyl 5-methylhexanoate of Comparative Example 4. Figure 7 shows the results of the number of mealybugs killed in Example 5 and Comparative Example 5. Figure 8 shows the results of the number of willow mealybugs killed in Example 5 and Comparative Example 5. The sustained-release pheromone formulation of the present invention targets mealybugs having 2,6-dimethyl-1,5-heptadiene-3-yl acetate as a sex pheromone substance and willow mealybugs having 3-methyl-3-butenyl 5-methylhexanoate as a sex pheromone substance, and comprises a mixture containing at least 2,6-dimethyl-1,5-heptadiene-3-yl acetate and 3-methyl-3-butenyl 5-methylhexanoate, and a container comprising a polymer material for containing said mixture. Sex pheromone substances may be natural products, but it is preferable to synthesize them for productivity reasons. 2,6-dimethyl-1,5-heptadiene-3-yl acetate is obtained by acetylating the resulting compound after performing a Wittig transfer reaction with 2-methyl-3-butene-2-yl 2-methyl-2-propene ether in the presence of a base. 3-methyl-3-butenyl 5-methylhexanoate is obtained by alkylating a malonic acid ester with a 3-methylbutyl halide in the presence of a base, then decarboxylating it in the presence of a metal halide and water, and using the obtained 5-methylhexanoate ester to perform an ester exchange reaction with 3-methyl-3-butenol in the presence of a Lewis acid. The mass ratio of 2,6-dimethyl-1,5-heptadiene-3-yl acetate and 3-methyl-3-butenyl 5-methylhexanoate is 80:20 to 20:80, preferably 75:25 to 25:75, and more preferably 75:25 to 50:50. The release rate of 3-methyl-3-butenyl 5-methylhexanoate, which is a sex pheromone substance of the mealybug, from a container containing a conventional polymer material such as polyethylene is faster compared to 2,6-dimethyl-1,5-heptadiene-3-yl acetate, which is a sex pheromone substance of the mealybug. However, by mixing the two sex pheromone substances in a certain