JPH02234615A - Pest control sheet - Google Patents

Abstract

PURPOSE:To provide the title inexpensive sheet excellent in workability and durability, high in control effect for pests such as long-horned beetles, consisting of a resinous sheet with the thickness not lower than a specified value having holes impenetrable for spheres of specified diameter which are distributed in a network manner. CONSTITUTION:The objective sheet consisting of a resinous sheet >=0.5 (esp. pref. 2-4) mm thick having holes in a network manner. The size of said holes is such as to be impenetrable for spheres 7mm in diameter but penetrable for spheres 1mm in diameter for the lower limit. This sheet, when assessed from the ovipositing behavior of e.g. long-horned beetles, can prevent the ovipositions if wrapped at a height ca. <=50cm from the ground on a trunk of e.g. citrus. The sheet can be produced by e.g. extrusion forming directly into a sheet form in a network manner of a highly weatherable resin such as polyolefin (copolymer) (e.g. PE, PP) or PVC containing, if needed, a weathering agent such as carbon black.

Description

[Detailed Description of the Invention] Industrial Application Fields The present invention is a resin sheet for controlling pests, particularly for controlling pests such as longhorn beetles, which are pests of deciduous fruit trees such as citrus fruits and apples, and green flowering trees such as maples. Regarding the seat.

[Conventional Techniques] Methods for controlling the above-mentioned tree pests, such as longhorn beetles, include: (2) applying an inorganic filler such as cichum to the ground level of the tree, (2) spraying pesticides, (3) applying an inorganic filler such as cichum There are methods such as applying pesticides containing fillers, but these methods have the following problems.

Although the method (1) above, in which an inorganic filler such as Tancal is applied, has some control effect, the degree of effect is insufficient. Also, the applied material may be washed away by rain, etc.
It takes time and effort to reapply it frequently. Methods (2) and (3) have the trouble of having to be sprayed or coated more than once every year.
In addition, the cost is high, and if the timing of spraying or application is incorrect, the pest control will not be sufficient.

[Problems to be Solved by the Invention] The purpose of the present invention is to provide a highly effective pest control method for pests such as longhorn beetles;
To provide a resin sheet for pest control having mesh-like holes that is low in cost and has excellent workability and durability.

[Means for Solving the Problems] In order to solve the above problems, the present inventors investigated the behavior of longhorn beetles during the spawning process. As a result, they discovered that the best way to prevent adult beetles from laying eggs on trees is to isolate them so that they cannot come into contact with trees, as described below. As a result of various studies based on this knowledge, it was discovered that a mesh-like resin sheet having holes of a specific thickness and a specific size is extremely effective, and the present invention was completed.

That is, the present invention provides a 0.5 m thick film having holes in a mesh shape.
m or more, the size of the hole is 7 mm or more in diameter.
This is a pest control sheet made of a resin sheet 1- which is large enough so that no. 11 balls cannot pass through it.

The pest control sheet of the present invention is produced by extrusion processing of resins such as polyethylene, polyolefin (including copolymers) such as polypropylene, polyvinyl chloride, etc., which have good weather resistance and contain a weathering agent such as carbon blank as necessary. It can be obtained either by directly processing it into a mesh-like sheet using a molding method (direct method), or by making holes in a sheet without holes obtained by a molding method such as extrusion processing (post-processing method). It will be done.

The pest control sheet of the present invention is used by wrapping the sheet near the ground level of a tree and fastening it preferably with a weather-resistant resin string or resin-coated wire. It is preferable that the number of times of wrapping around the tree is one or more times.

As a sheet for preventing longhorn beetles, for example, the egg-laying habit of the long-eared longhorn beetle, which is a pest of citrus fruits, is that it first gnaws near the ground edge of a tree to create a place to lay eggs, then turns half a turn and lays eggs in that place from its tail. Therefore, it is necessary to use a sheet that prevents the area near the ground level of the tree from being chewed by pests. Furthermore, since it is likely to be used for several years due to cost and installation work, it is necessary that it does not interfere with the growth of trees. That is,
It is desirable to have a sheet that has holes large enough for longhorn beetles to not be able to sneak in through their heads, yet thick enough that they cannot be chewed through, and that does not interfere with tree growth.
The size of the holes in the mesh sheet is preferably such that a sphere with a diameter of 7n+ cannot pass through, and the thickness of the sheet is preferably 0.5 mm or more.

The specific shape of the hole that a ball with a diameter of 7 m cannot pass through is a square or rectangle with a vertical and horizontal length of 7 squares or less, a circle with a diameter of 7 mm or less, and a hole through which a cough ball cannot pass. They are triangles, rhombuses, trapezoids, polygons, ellipses, irregular shapes, and rectangles other than those listed above. In addition, "a ball with a diameter of 7N will not pass through" means that the ball will not pass through the hole without applying any special force to the ball, and it will not pass through the hole unless a force is applied that deforms the sheet or the hole. If the ball passes through the hole, it does not pass through the hole.

The lower limit of the size of the hole in the sheet of the present invention is such that a ball with a diameter of 1 crane can pass through it, in order to make it easier to wrap the sheet around a tree.

The thickness of the sheet of the present invention is 0.5 mm or more. If the length is less than 0.5 fins, longhorn beetles may gnaw near the ground level of the tree and lay eggs. There is no particular upper limit on the thickness, but
From the viewpoints of ease of work such as winding, economy, etc., about 5 cranes is preferable. More preferred is 2 to 4 squares.

Judging from the egg-laying habits of longhorn beetles, the sheet of the present invention is
It is sufficient to wrap it mainly near the ground level of the tree, that is, up to a height of about 50 cm above the ground, but it may also be wrapped higher.

Next, the present invention will be explained with reference to specific examples.

Examples 1-2 (1) Processed polyethylene resin for pest control sheet (d = 0.92 g/cJ,
Melt index at 190°C and 2.16 kg/d+ 0. 5 g/10 minutes) was mixed with a polyethylene carbon black masterbatch (containing 30 wtχ of carbon black) so that the carbon blank was 0.8 wtχ with respect to the total resin, and extrusion processing was performed at 160 to 190°C.
It has a hole with a size of 7 length x 7 width, 1111, and a thickness of 3
．． A mesh-like sheet of five cranes was obtained.

(2) Wrapping the sheet The method of using the sheet of the present invention will be explained with reference to the drawings.

Figure 1 shows the pest control sheet 1 obtained in step 11 above. Figure 2 shows the sheet 1 wrapped around the ground of a tree 2 and coated with polyethylene resin, which has good weather resistance. This figure shows the state in which it is secured and attached with a wire 3.

How to replace the sea 1 river is to dig a little underground part of tree 2,
Slightly embed the sheet 1 in the soil 4 and remove it to protect the area around the tree 2 to a height of about 40 cm from the ground level.
J Keta.

(3) Pest control performance In a small greenhouse covered with white cheesecloth, tangerine tree samples (two for each example), which were planted in pots with a volume of 2Off and wrapped with a sheet, were randomly placed inside the greenhouse. Two male and 12 female longhorn beetles were released for 11 days, and then the number of eggs laid on the mandarin tree samples was examined. The results are shown in Table 2.

Comparative Examples 1 to 4 The sheets or films shown in Table 1 were wrapped around trees in the same manner as in the examples, and their performance in controlling longhorn beetles was examined. In addition,
The pest control performance test was conducted at the same time as the example and treatment method "No treatment j".

The results are shown in Table 2.

Table 1 Table 2 As shown in Table 2, it can be seen that the pest control sheet made of the mesh resin sheet of the present invention is superior in all respects to other sheets and films.

[Effects of the Invention] As described above, the insect pest control sheet of the present invention is made of a mesh-like resin sheet having holes of a specific size and a specific thickness. Items with excellent pest control performance and weather resistance are 2.
It is highly effective in terms of pest control work and cost, as it can be left wrapped around trees for more than three years, and it also takes economic efficiency and tree growth into consideration. This is a highly practical pest control sheet that can be used to control insects.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of the pest control sheet of the present invention, and FIG. 2 is a perspective view showing an example of how this sheet is used when wrapped around a tree.・・・Pest control sheets ・Trees ・Wire etc. ・Soil

Claims (1)

[Claims] (1) A pest control sheet made of a resin sheet having a mesh of holes with a thickness of 0.5 mm or more, the holes having a size that does not allow a ball with a diameter of 7 mm to pass through.