JP2013087091A - Agent and method for controlling codling moths - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controlling agent and a controlling method for safely and economically controlling codling moths.SOLUTION: The controlling agent to be applied to a surface of a fruit to prevent the codling moths from depositing eggs on the surface of the fruit such as an apple, a pear, a peach, a plum, or the like, is characterized by containing inorganic powders consisting of calcium carbonate or magnesium carbonate and a fixing agent for fixing the inorganic powders to the surface of the fruit.

Description

  The present invention relates to a control agent applied to the surface of a fruit and a control method using the control agent in order to prevent spawning of eggs from apples, pears, peaches, plums and the like.

  Sinkworms such as peach moths lay eggs on the surface of fruits such as apples, pears, peaches, plums, etc., and hatched larvae will sink inside the fruits, so they cannot be controlled by normal drug spraying. For this reason, although pest control has been conventionally performed with a bag of fruit, etc., there is a problem that the bag is labor intensive. In recent years, insecticides and pheromone disruptors have been developed and controlled by spraying these agents instead of physical bagging.

  However, insecticidal effects are temporary and need to be frequently controlled. Moreover, the pheromone disruptor is expensive, and it is necessary to install a material impregnated with the pheromone disruptor in the fruit tree, and there is a problem that the installation takes labor.

  As will be described later, the insect control agent of the present invention includes an inorganic powder such as calcium carbonate and a fixing agent. Patent Document 1 and Patent Document 2 disclose slips control agents containing inorganic powder such as calcium carbonate and a fixing agent. However, it is not disclosed in these prior arts that such a control agent is effective as a control agent for beetles. In these prior arts, it is disclosed that by spraying a control agent, the whole plant can be whitened and slips can be controlled by the reflected light.

  However, as disclosed in Non-Patent Document 1, egg-laying on the fruit surface of the sink moth, such as peach sink moth, is performed at night. For this reason, for those skilled in the art, such an effect in the control of slips cannot be expected for spawning on the fruit surface at night by the beetles.

JP-A-8-198113 JP 60-149508 A

Aomori Prefectural Agriculture and Forestry Research Center, Apple Experiment Station Research Report No. 35 (2008): Koji Kawashima “Fundamental Studies on the Ecology of Peach Shiniga”

  An object of the present invention is to provide a safe and economical control agent and control method for the worms.

  The control agent of the present invention is a control agent that is applied to the surface of fruits to prevent the beetle from laying eggs on the fruit, the inorganic powder comprising calcium carbonate or magnesium carbonate, and the inorganic powder on the fruit surface. It contains the fixing agent for making it adhere to.

  Since the control agent of the present invention contains inorganic powder and a fixing agent, it is a safe and economical control agent.

  The average particle size of the inorganic powder is preferably in the range of 0.1 to 3 μm.

  As the inorganic powder, calcium carbonate is particularly preferable.

  The fixing agent is at least one selected from the group consisting of synthetic resin emulsion, polyacrylate, polyvinyl alcohol, polyoxyethylene, wax, polyvinyl alkyl ether, formalin condensate of alkylphenol, starch phosphate ester and paraffin. It is preferable.

  In this invention, it is preferable that 0.5-10 mass parts of fixing agents are contained with respect to 100 mass parts of inorganic powder.

  The method for controlling the worms of the present invention comprises a step of preparing a spray liquid containing the control agent of the present invention, and a step of spraying the spray liquid on the surface of the fruit and applying the control agent to the surface of the fruit. It is characterized by that.

  According to the control method of the present invention, it is possible to control syncytiums safely and economically.

  According to the present invention, the worms can be controlled safely and economically.

  Hereinafter, the present invention will be described in more detail.

<Inorganic powder>
The inorganic powder used in the present invention is calcium carbonate or magnesium carbonate. Magnesium carbonate also includes basic magnesium carbonate. Further, dolomite, which is a double salt mineral of calcium carbonate and magnesium carbonate, may be used as the inorganic powder of the present invention. Among these, calcium carbonate is particularly preferably used.

  As calcium carbonate, heavy calcium carbonate, precipitated calcium carbonate, or the like can be used.

  The average particle size of the inorganic powder is preferably in the range of 0.1 to 5 μm, more preferably in the range of 0.1 to 3 μm, and still more preferably in the range of 0.5 to 1 μm. It is. If the average particle size of the inorganic powder is too small, the bulk becomes high and it may be difficult to handle. If the average particle size of the inorganic powder is too large, the effects of the present invention may not be sufficiently obtained.

<Fixing agent>
The fixing agent used in the present invention is selected from the group consisting of synthetic resin emulsion, polyacrylate, polyvinyl alcohol, polyoxyethylene, wax, polyvinyl alkyl ether, alkylphenol formalin condensate, starch phosphate ester and paraffin. There are at least one kind.

<Control agent>
In the control agent of this invention, it is preferable that 0.5-10 mass parts is contained with respect to 100 mass parts of inorganic powder, More preferably, it is preferable that 1-5 mass parts is contained. . If the amount of the sticking agent is too small, the sticking property of the inorganic powder is lowered, and the sustainability of the effect may be a problem. If the content of the sticking agent is too large, white stains may remain on the surface of the fruit when the fruit is harvested.

  The form of the control agent in the present invention is not particularly limited as long as the inorganic powder and the fixing agent are contained. For example, it may be in the form of powder, or may be in the form of a dispersion in which the fixing agent is dissolved and the inorganic powder is dispersed. When the dispersion liquid is used, it may be in the form of a concentrated dispersion liquid that can be diluted with water and used as a spray liquid on site. As the dispersion medium, water is generally used.

<Control method>
In the control method according to the present invention, a spray liquid containing the control agent of the present invention is first prepared. As described above, the control agent may be in the form of a powder or in the form of a dispersion. Preferably, a dispersion as a concentrated stock solution is used, and this dispersion is diluted with water to be used as a spray liquid.

  The concentration of the inorganic powder in the spray liquid is preferably 10 to 300 times, more preferably 20 to 200 times in terms of mass ratio (dispersion medium / controlling agent solid content). Particularly preferably, the range is 25 times to 100 times.

  The concentration of the fixing agent in the spray liquid is appropriately adjusted according to the content of the inorganic powder in the spray liquid.

  The spray liquid in the present invention can be prepared, for example, by dispersing a mixed powder obtained by mixing an inorganic powder and a fixing agent in water as a dispersion medium.

  In the control method of the present invention, the spray amount of the spray liquid is not particularly limited, but is preferably 200 to 700 liters per 10 ares of the field, for example. If the application amount is too small, the effects of the present invention may not be sufficiently obtained. If the amount of application is too large, an effect proportional to the increase of the amount of application cannot be obtained, which may be economically undesirable.

  By applying the control agent of the present invention to the surface of a fruit, spawning of the beetles can be prevented. As described above, egg laying on the fruit surface of the beetles is carried out at night, and therefore the effect of controlling by making the coated surface white and reflecting in controlling slips cannot be expected. It is considered that the effect of preventing the oviposition of the beetles is different from the effect of the control of the slips, and the control of the beetles has the unevenness on the fruit surface by applying the control agent of the present invention to the fruit surface. This is thought to be due to the formation.

  That is, it is considered that by applying the control agent of the present invention to the fruit surface, irregularities are formed on the fruit surface, and the surface with the irregularities is recognized as not being a fruit surface.

  Hereinafter, the present invention will be described with reference to specific examples, but the present invention is not limited to the following examples.

(Example)
<Preparation of control agent>
As the inorganic powder, heavy calcium carbonate having an average particle diameter of 1 μm was used. 95 parts by mass of this calcium carbonate and 5 parts by mass of vinyl acetate resin (emulsion powder) as a fixing agent were mixed to prepare a control agent as a powder.

<Preparation of spray liquid>
The control agent prepared as described above was added to water 50 times the mass ratio of the control agent and mixed by stirring to prepare a spray liquid.

<Spraying spray liquid>
About 5 liters per main branch of the spray liquid prepared as described above was sprayed using a back-charge rechargeable sprayer.

  The number of investigated fruits was set to 100, and the number of investigated fruits was set to 50 in each of the I and II districts.

  Spraying was carried out three times about every two weeks, and fruits were harvested about 80 days after the last spraying.

<Evaluation results and discussion>
The harvested fruits were dismantled and the number of damage fruits and the rate of damage fruits were determined by using the spawning eggs of damselfly (Peach moth) as damage fruits. The results are shown in Table 1.

  Moreover, about the thing which has not spread | dispersed the spray liquid, the number of investigation fruit was similarly set to 100, and the number of damage fruits and the rate of damage fruits were calculated | required.

  As is clear from the results shown in Table 1, a very high control effect was observed by spraying the spray liquid using the control agent according to the present invention.

Claims (6)

A control agent applied to the surface of the fruit to prevent the beetles from laying eggs on the fruit,
An insecticide for insects characterized by containing an inorganic powder composed of calcium carbonate or magnesium carbonate and a fixing agent for fixing the inorganic powder to the fruit surface.   The mean particle size of the inorganic powder is in the range of 0.1 to 3 µm, and the control agent for the worms according to claim 1.   The insect worm control agent according to claim 1 or 2, wherein the inorganic powder is calcium carbonate.   The fixing agent is at least one selected from the group consisting of synthetic resin emulsion, polyacrylate, polyvinyl alcohol, polyoxyethylene, wax, polyvinyl alkyl ether, formalin condensate of alkylphenol, starch phosphate ester and paraffin. The insect worm control agent according to any one of claims 1 to 3, wherein   The control agent for the beetle worms according to any one of claims 1 to 4, wherein the fixing agent is contained in an amount of 0.5 to 10 parts by mass with respect to 100 parts by mass of the inorganic powder. A step of preparing a spray liquid containing the control agent according to any one of claims 1 to 5;
A method for controlling worms, comprising: spraying a spray liquid on a fruit surface and applying a control agent to the fruit surface.