JP4320147B2 - Control method for Okinawa crickets by communication disruption - Google Patents

Description

【００１７】
【表２】

【００１８】
表１に示すように、比較例（宮城島）に設置した性フェロモントラップには一週間で１６０．４頭の誘殺が認められたが、実施例（南大東島）ではわずか０．８頭の誘殺しか認められなかった。このことから、本交信撹乱剤は、非常に高い交信撹乱効果を有することがわかる。
また、表２に示すように、比較例（宮城島）の交尾率は、３月２９日が８８．９％で、それ以降１００％であったが、実施例（南大東島）の交尾率は、４月１０日で４２．９％、４月２４日でも８４．９％と低く、明瞭な交尾阻害効果が認められた。
【００１９】
【発明の効果】
本発明による交信撹乱によるオキナワカンシャクシコメツキの防除法を用いれば、本種の交尾を強力に阻害することができ、本種の防除法として非常に有効である。[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for effectively controlling okinawa kakushime kometsuki (scientific name: Melanotus Okinawensis Ohira), which is an important pest of sugarcane, by communication disturbance.
[0002]
[Prior art]
The sex pheromone of the Lepidoptera insect is species-specific in composition and composition ratio, and at the same time, the concentration range having attraction activity varies depending on the species. It is known that there is no reaction below this concentration range, an abnormal response is shown above this level, and insects that have been continuously exposed to sex pheromones above this concentration range are known to be unreactive. Pest control by communication disruption uses this biological reaction, and the place where the pests are generated is filled with a synthetic pheromone (disturbing substance) with a concentration greater than or equal to the attracting active concentration, disturbing the sex pheromone communication between males and females, and the mating rate To reduce the density of next-generation larvae.
[0003]
Synthetic pheromones used for communication disruption have been put to practical use in lepidoptera such as moss as a clean pest control means because they are extremely toxic and have no concern about environmental pollution. However, in Coleoptera insects, although the sex pheromone has been isolated and identified in many species, communication disruption has not been successful. The reason for this is that the sex pheromone activity of Coleoptera is also present in a high concentration range, and the upper limit in the attractive activity concentration range observed in lepidopterous pests is not observed.
[0004]
For example, in Okinawa Kanshokumetsuki, it is attracted to an attracting source in which 1 mg of synthetic pheromone (n-dodecyl acetate) is supported on a rubber cap, but normal attraction is observed even when the amount is increased 1000 times ( No decrease in reactivity occurs as in the case of Lepidoptera insects. From these observations, it has been considered that communication disruption is less likely to occur in Coleoptera, and pest control by communication disruption is difficult.
[0005]
In fact, in Okinawa Kanshakumetsuki, a mass killing method has been studied and put into practical use after isolation and identification of sex pheromones (Nagato, 2000, Sex Pheromone Use Guide, Japan Plant Protection Association, Tokyo, pp. 106- 108).
This kind of mass killing is a method in which a sex pheromone trap is set at a rate of 100 ha or more at a rate of 1 to 1 to 3 ha to remove male adults and lower the mating rate. In Okinawa Prefecture, it has been implemented for more than 10 years since the late 1980s, and a certain degree of control effect has been recognized. However, drastic pesticide reduction has not been achieved, and recently problems such as a great deal of labor for trap maintenance have been highlighted.
[0006]
[Problems to be solved by the invention]
A large amount of pesticides has been irrigated by the control of Okinawa Kanshakumetsuki, and there are concerns about environmental pollution and groundwater pollution. There is a limit to controlling this species, which is a soil pest, only with pesticides, and development of a control method to replace pesticides is required.
Therefore, the inventors of the present invention intend to provide a method for controlling Okinawa crispice by communication disturbance.
[0007]
[Means for Solving the Problems]
In order to solve such problems, the present inventors have conducted extensive research on the use of the sex pheromone of the Okinawa citrus fruit, and as a result, the communication disruption method is very effective for controlling this species, preferably per hectare. It was found that the mating inhibition of this species occurred by treating 50-1000 g of synthetic pheromone (n-dodecyl acetate) of Okinawa citrus rice seeds in the field, thereby completing the present invention.
[0008]
The present invention provides a method for controlling Okinawa crispice by communication disruption, preferably a control method for Okinawa crispula using a communication disruptor containing n-dodecyl acetate as an active ingredient. The purity of n-dodecyl acetate is preferably 90% by weight or more.
DETAILED DESCRIPTION OF THE INVENTION
[0009]
The active ingredient of the communication disrupter of the present invention is n-dodecyl acetate, which can be synthesized by a conventional method. Although it is desirable that this component has a high purity, there is no problem in the effect as long as the total weight is 10% by weight or less even when the alcohol or structural isomer is included as an impurity. However, if the content of the alcohol is more than 10% by weight, the mating inhibitory effect is lowered, so that the content of the alcohol is required to be careful.
[0010]
The communication disruptor of the present invention is made of a thin tube made of a plastic having a function of controlling the amount of release, such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, or laminate, in order to gradually release the above active ingredients over a long period of time. Used by filling containers such as bags and ampoules.
[0011]
Furthermore, in formulating, an appropriate amount of an antioxidant such as butylhydroxytoluene (BHT) or vitamin E or an ultraviolet absorber may be added. The appropriate amount is, for example, 1 to 5% by weight of the antioxidant and 1 to 5% by weight of the ultraviolet absorber with respect to the weight of n-dodecyl acetate.
[0012]
Although the preferable usage-amount of the communication disrupting agent of this invention changes with various conditions, such as the generation amount of a pest, a weather, or topography, it is 50-1000 g / ha normally.
[0013]
【Example】
EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.
EXAMPLE Using n-dodecyl acetate, which is a sex pheromone component of Okinawa Kanshakumekkome, as an active ingredient, and adding 1% by weight of BHT as a stabilizer, an outer diameter of 2.31 mm, an inner diameter of 1.21 mm, and a length It was sealed in a 10-m polyethylene tube and used as a sustained-release communication disrupter. Each tube was filled with approximately 8 g.
[0014]
This communication disruptor was stretched over the ridges using a strut to a height of 30 to 40 cm from the ground at a rate of 8 per hectare in a sugarcane field 1280ha on Minami Daitojima (Okinawa) (10240 in total) ). In addition, in the newly planted summer sugarcane field 220ha where the damage of this species is large, 20 spots per hectare were installed on the leaves with tape (4400 in total). In addition, a communication disturbing agent was also treated in the protection forest and Susukihara that were in contact with the sugarcane field, and about 18,000 communication disrupting agents were treated on about 3000 ha of Minami Daito Island.
In order to examine the effects of communication disrupters, a total of 24 sex pheromone traps were installed throughout Minami Daitojima, and the number of killings was examined periodically (Table 1). In addition, the control effect was examined from the mating rate of adults captured from sugarcane leaf sheaths (Table 2).
[0015]
Comparative Example Miyagijima (Okinawa), which was not treated with the communication disruptor, was set as a control zone, 10 sex pheromone traps were installed, and the mating rate of adults was examined in the same manner as Minamidaitojima.
[0016]
[Table 1]

[0017]
[Table 2]

[0018]
As shown in Table 1, the sex pheromone trap installed in the comparative example (Miyagijima) was found to have 160.4 killings per week, but in the example (Minamidaitojima) only 0.8 killings were found. I was not able to admit. From this, it can be seen that the communication disrupting agent has a very high communication disrupting effect.
Moreover, as shown in Table 2, the mating rate of the comparative example (Miyagijima) was 88.9% on March 29 and 100% thereafter, but the mating rate of the example (Minamidaitojima) was On April 10, it was 42.9% on April 24 and 84.9%, indicating a clear mating inhibitory effect.
[0019]
【The invention's effect】
By using the control method for Okinawa crickets by disruption of communication according to the present invention, mating of this species can be strongly inhibited, which is very effective as a control method for this species.

Claims (2)

A control method for Okinawa crispula using a communication disruptor comprising n-dodecyl acetate as an active ingredient, wherein the amount of the communication disruptor used is 50 to 1000 g / ha.   The method according to claim 1, wherein the purity of the n-dodecyl acetate is 90% by weight or more.