JP2013165653A - Method for capturing weevils - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for efficiently attracting and capturing weevils, which are stored grain insect pests.SOLUTION: In a method for capturing weevils by emitting an infrared ray to attract and capture the weevils, preferably an infrared-emitting diode is used for the emission of infrared rays, and here the weevils are ones belonging to Callosobruchus maculatus.

Description

  The present invention relates to a method for effectively attracting and capturing weevil which is a stored grain pest.

  In agricultural production, spraying of insecticides and fungicides, which are chemically synthesized pesticides, is still being carried out in order to protect crops from damage such as pests and diseases. However, health problems and environmental problems have been addressed, and progress is being made toward reducing spraying agents such as reduced pesticide cultivation and pesticide-free cultivation. However, the establishment of alternative technologies and alternative control is a major issue. Alternative control includes biological control, physical control, etc., but in recent years the pest density level has been reduced to an acceptable level for economic damage by reducing the amount of pesticides and fungicides used and combining with other control methods. The following pest population management system (IPM) has been proposed to reduce and maintain at a low level. There is a need for technology that reduces the environmental impact of pesticides and achieves the maximum control effect with the minimum amount of energy to be invested, based on the concept of managing, not eradicating pests.

As one of these, in recent years, a method for physically controlling pests with light using LED illumination has attracted attention, and a terrestrial arthropod capture device using a light emitting diode that emits visible light (Patent Document 1) or blue. A stored grain pest capturing method (Patent Document 2) in which a light emitting diode or a white light emitting diode is caused to emit light to attract and capture has been proposed.
By the way, the color recognition of nocturnal insects such as moths and some beetles and stink bugs is shifted to the ultraviolet region (250 to 400 nm) from the range of human visible light (400 to 700 nm), Many insects recognize ultraviolet rays invisible to humans as “colors”. Among light sources that attract nocturnal insects, light sources that emit relatively much ultraviolet light (blue fluorescent lamps, black lights, mercury lamps, etc.) are said to have a higher attraction (Non-Patent Document 1).

However, weevil which is a stored grain pest has a problem that it is not attracted sufficiently by visible light and ultraviolet rays.
In addition, a collector (Patent Document 3) that emits infrared rays close to infrared rays (wavelength close to body temperature) emitted by the human body to attract blood-sucking insects such as mosquitoes has been proposed. There is no mention or suggestion about being attracted to.

JP 2003-88288 A JP 2008-22833 A JP 2005-65631 A

Kenichiro Honda “Establishment of pest control technology using light” (Abstract of 15th Agricultural Plant Disease Control Forum June 17, 2009)

  The problem to be solved is to provide a method for efficiently attracting and capturing weevil, a stored grain pest.

  The inventor conducted experiments on the weevil running property using light of various wavelengths, and surprisingly found that the weevil showed positive running property with respect to infrared rays. The present invention has been made on the basis of such findings, and has the main feature of attracting and capturing weevil by emitting infrared rays.

  The present invention can capture weevil which can occur in large quantities in cereal storage facilities or in containers or ships during transportation. Compared with insecticides, etc. In addition to ensuring safety, the use of the LED has an excellent effect in terms of energy saving.

FIG. 1 is an explanatory view showing a preferred weevil capturing apparatus of the present invention.

Infrared rays are electromagnetic waves having a wavelength of 700 nm to 1000 μm. In the present invention, any of these wavelengths may be used, but preferably a near infrared band of a wavelength of 700 to 2500 nm or a medium red of 2.5 to 4 μm. The outer band is preferred.
In addition, the light source that emits infrared rays used in the present invention is not particularly limited as long as it emits infrared rays, and a commercially available infrared lamp or light emitting diode can be used, but in particular, from the viewpoint of energy saving. Infrared light emitting diodes are preferable, and light emitting diodes having peak wavelengths of 850 nm, 870 nm, 940 nm, and 950 nm are particularly preferable. These light emitting diodes are usually used as a lighting device equipped with several tens of LED elements.
Furthermore, when using an infrared light emitting diode, a solar battery, a dry battery, a lithium battery, or the like can be used as a power source. Since these can be installed in the capturing device, they can be easily installed regardless of the installation location of the device.

  The weeviles to be captured in the present invention are so-called weevil and bean weevil, and taxonomically belongs to the weevil weevil superfamily weevil family, the same weevil family, and the weevil family (the beetle family weevil). It is an insect. Among them, weevil, which is a pest of gramineous grains, and weevil, azuki beetle, which are pests of red beans and cowpeas, and pea weevil, broad beetle, which are other pests of beans. In particular, the present invention is excellent in capturing the black weevil.

  For capturing weevil attracted by infrared radiation, a generally used method for capturing insects can be used. For example, there are a trap structure method that cannot be removed once entered, a method of capturing by adhesive force using an adhesive, a method of killing by electric shock, and a method of killing by an insecticide. However, it is preferable because it can be reduced in size, does not require electrical wiring work, etc., can be installed in a storage facility, a container, an arbitrary place in a ship, and only collects weevil at regular intervals.

  As a trapping method using a trap structure, for example, as shown in FIG. 1, an inverted truncated cone lid 2 having an open top and bottom is provided on the top of an opaque tube 1, and the bottom of the tube 1 It is preferable to use a capture device in which the transparent bottom plate 3 is attached and the illumination device 4 in which the LED element that emits infrared rays is attached to the bottom plate 3 is attached upward, since the structure is simple and the handling is simple. In this capturing device, the weevil attracted by infrared rays enters from the open part of the upper inverted truncated cone, cannot fall to the bottom of the tube 1 and escape, and can be easily captured. The captured weevil is collected by removing the top lid. Since weevils are about 2 to 4 mm, it is sufficient that the size of the device is 5 to 50 cm in diameter, 10 to 50 cm in height, and 1 to 5 cm in the size of the bottom of the open part. Moreover, although it depends on the size of the device, it is sufficient that about 20 to 100 LED elements are mounted, and the lighting device can be a very compact capturing device.

(Test light source)
An LED lighting device equipped with 38 single-color LED elements was used. The light colors of the LEDs used are six types: ultraviolet (405 nm), blue (470 nm), green (530 nm), yellow (590 nm) and red (630 nm), and infrared (850 nm).

(experimental method)
A small room (booth) at both ends is irradiated with one color each with LED lighting, and a device with a partition in the center (length: 100 mm x width: 30 mm x height: 30 mm) is used so that the lighting does not interfere. It was. During the experiment, the lid was covered to cover the entire apparatus, and the experiment was performed without any external light. Twenty Japanese beetles were left in the center, and the number of individuals that moved after 160 minutes was counted.

(result)
Table 1 shows the rate of movement between the monochromatic light irradiation part and the dark part when the booth at one end is illuminated with monochromatic light and the booth at the other end is not illuminated and is a dark part. As a result of performing a multiple comparison test (Tukey) on the transfer rate between booths, when using infrared rays of 850 nm, p <0.01 between those moved to the infrared side, dark portions, and those remaining. A significant difference was obtained for the other colors, and no significant difference was obtained for the other colors. In addition, it was red light that had the next highest rate of movement, but the movement to red light varied widely and the movement was not stable. This can recognize wavelengths in the infrared region, but the vicinity of red light is considered to be the boundary of color recognition.

  On the other hand, Table 2 shows the results of the transfer rates to the infrared illumination unit and the monochromatic light irradiation unit when the booth at one end is illuminated with infrared rays and the booth at the other end is illuminated with each monochromatic light. As a result of the multiple comparison test (Tukey) for the movement between booths, when comparing infrared and other colors, p <0.05 only for blue and for light of other colors A significant difference was obtained with p <0.01.

  From the above results, it can be seen that for weevil, a wavelength near the infrared region, which is a wavelength longer than red light, is effective for collection.

  INDUSTRIAL APPLICABILITY The present invention is useful for capturing weevil which can be generated in large quantities in a grain storage facility or in a container or ship during transportation.

1 cylinder 2 lid 3 bottom plate 4 lighting device

Claims (3)

  A method for capturing a weevil, characterized by attracting and capturing weevil by emitting infrared rays.   The weevil capturing method according to claim 1, wherein an infrared light emitting diode is used for infrared radiation.   The method of capturing weevils according to claim 1 or 2, wherein the weevil is a weevil.

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