JPH0788285B2 - Insecticide for stored brown rice pests - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for killing harmful insects of brown rice contained in a storage warehouse.

[Conventional technology]

Currently, the storage of brown rice in Japan is carried out in a low-temperature warehouse (15 ° C or less) or a semi-low-temperature warehouse (20 ° C or less) with a large capacity. If the amount of brown rice exceeds the capacity of these low temperature warehouses, it must be stored in a room temperature warehouse. When brown rice is stored in such a room temperature warehouse, there is a serious problem that a large amount of stored-grain pests such as succulents, stag beetle family (mainly Hirata sectidae), and nodume stag beetle are caused, and the rice polishing yield is significantly deteriorated. It's Conventionally, chlorpicrin (allowable concentration 0.1 ppm), hydrogen phosphide (allowable concentration 0.3 pp
Insecticides such as m) and methyl bromide (acceptable concentration 5ppm) are used, but they have a problem in terms of harmfulness to humans.

[Problems to be Solved by the Invention]

The use of the above-mentioned conventional insecticides has been regarded as a problem with respect to their harmfulness, and there is a serious limitation on the insecticide of stored brown rice pests.

It is an object of the present invention to provide a method for controlling brown rice harmful insects stored at a very high insecticidal efficiency without harming the quality of the brown rice after insecticidal.

[Means for Solving the Problems]

In order to achieve the above object, the present invention employs a means for killing brown rice harmful insects by keeping the inside of a brown rice storage warehouse in a vaporized carbon dioxide gas atmosphere of liquefied carbon dioxide gas without using a conventional insecticide.

Also, in low-temperature warehouses and room-temperature warehouses, there is a stacking relationship between the loading and unloading of packed brown rice in a breathable bag such as a hemp bag, so this attachment is integrated with a sheet with low gas permeability. It is advisable to hermetically seal the sheet and to seal the sealed sheet with vaporized carbon dioxide of liquefied carbon dioxide to kill brown rice pests.

In addition, in the brown rice storage warehouse, a bag inflated in a space other than the bag of brown rice is placed inside the bag to reduce the space and supply the vaporized carbon dioxide of liquefied carbon dioxide to the cabinet. Kill brown rice pests in a gas atmosphere.

[Action]

By adopting the above means, the brown rice pests can be killed in the brown rice storage warehouse having a large storage capacity by the carbon dioxide gas generated by the vaporization of the liquefied carbon dioxide gas under the atmosphere of the desired carbon dioxide concentration.

In addition, a bag of brown rice in a warehouse is integrally sealed with a low gas permeable sheet, and vaporized carbon dioxide of liquefied carbon dioxide is enclosed in the sealed sheet to a desired carbon dioxide concentration to kill brown rice pests. . According to this means, the consumption of liquefied carbon dioxide can be significantly reduced.

By keeping the carbon dioxide gas concentration in the storage and the carbon dioxide gas concentration in the sealing sheet at 50% or more, brown rice harmful insects can be killed. The manifestation of such an insecticidal effect is due to suffocation due to carbon dioxide. If the carbon dioxide concentration is less than 50%, the pests may remain, so the carbon dioxide concentration should be
It is preferably 50% or more. Even at such a concentration, it does not affect the quality of milled rice. Especially in a room-temperature warehouse, the higher the temperature inside the store, the more the breeding of brown rice pests. However, in a carbon dioxide atmosphere, the higher the temperature inside the store, the more effective the insecticidal effect becomes.

For example, a method for controlling parasitic insects of dry foods with carbon dioxide is described in JP-A-49-458, and a method for insecticidal treatment of crude drugs and spices in a carbon dioxide atmosphere is described in JP-B-61-36745. It is known that carbon dioxide exerts an insecticidal effect. However, regarding the technical problem of killing a large amount of brown rice pests stored in the warehouse,
Considering that it has not been adopted in the past, it can be said that it is a blind spot.

In order to maintain the inside of the brown rice storage warehouse, which has a large storage capacity, in a carbon dioxide atmosphere, it is difficult to set the carbon dioxide concentration in the warehouse to the desired value by simply supplying carbon dioxide, and the expected insecticidal effect is expected. Therefore, in the present invention, the point of using carbon dioxide gas by vaporization of liquefied carbon dioxide gas is a source for exhibiting the effect of the present invention.

As can be seen, the brown rice storage warehouse has a large storage capacity, so depending on the storage capacity of the brown rice, there may be some attachments of bagged brown rice in several places, and the storage inside the storage may be several stages. In this case, there is a space below the ceiling. Since it is uneconomical to make a carbon dioxide atmosphere up to such a space only because it increases the consumption of liquefied carbon dioxide, the present invention is directed to the space between the bagged brown rice and / or
In addition, a gas-expanded bag was placed in the space below the ceiling, and the space other than the expanded bag was filled with carbon dioxide to kill brown rice pests.

〔Example〕

 The present invention will be specifically described below with reference to examples.

Example 250 brown rice converted to 1 10m × 15m × 6m (H ) in a warehouse volume 900 meters ³
It accommodated tons and marked all openings in the warehouse. Eggs of Kokuzo and Hiratakokunusutomodoki are placed in lined brown rice in positions of 4m above the floor, 2m in the middle, and 0.2m below the floor.
50 larvae, pupae, and 50 adults were put in each.

The carbon dioxide gas obtained by vaporizing the liquefied carbon dioxide gas is fed into the chamber and the carbon dioxide concentration is 60% or more for 3 days (average temperature 28
When kept, the eggs, larvae, pupae, and adults of the above-mentioned pests were all dead.

Example 2 A stack of 60 kg hemp bags of brown rice in a 32 × 25 stack (48 tons of brown rice) was sealed with a sheet having low gas permeability.

30 eggs, larvae, pupae, and adults of each of the elephants, Nostocella japonica, and Pleurotus ostreatus were placed in the top, middle, and bottom bags of brown rice in advance.

The sealing sheet has two holes at the top and bottom to vaporize the liquefied carbon dioxide and supply the carbon dioxide through the bottom hole. The air is evacuated from the top hole and when the carbon dioxide concentration reaches 50% in the top hole. The supply of carbon dioxide gas was stopped, the upper and lower holes were closed, and it was left in a sealed state for 7 days (average temperature 30 ° C.). As a result, the eggs, larvae, pupae, and adults of the above-mentioned pests were dead at all stages.

Example 3 In the attached state B in which the packed brown rice is stacked in the warehouse shown in the attached drawing, several space bags formed by inflating compressed air are built in the space portion formed under the ceiling to make a space space of about 30.
% To keep the inside of the chamber carbon dioxide atmosphere to kill the brown rice pests. The consumption of liquefied carbon dioxide has been saved by reducing the space.

In the attached drawings, 1 is a liquefied carbon dioxide gas container, 2 is a vaporizer,
Reference numeral 3 denotes a vaporized carbon dioxide gas supply pipe, which is provided with a carbon dioxide gas sampling pipe 4 on the storage wall, and a carbon dioxide concentration meter 5, a recorder 6 and the like which are connected to the pipe. In addition, a ventilation mechanism is provided at a proper place in order to sufficiently ventilate the inside of the refrigerator after the insects are killed.

In particular, in an aged storage warehouse, it is advisable to line the storage walls and ceiling with sheets or thin iron plates in advance in order to prevent carbon dioxide from leaking through the cracks.

〔The invention's effect〕

The present invention, by taking the means as described above,
The pests of brown rice stored in the brown rice storage warehouse with a large capacity can be completely killed. Further, by incorporating the gas-expanded packaging bag in the internal space portion, it is possible to reduce the consumption of liquefied carbon dioxide gas by the amount occupied by the packaging bag.

[Brief description of drawings]

The accompanying drawings illustrate aspects of one embodiment of the present invention. 1 ... Liquefied carbon dioxide container, 2 ... Vaporizer, 3 ... Carbon dioxide gas supply pipe, 4 ... Carbon dioxide sampling pipe, 5 ... Carbon dioxide concentration meter, 6 ... Recorder, A ... Inflatable bag , B ……
Attach.

Claims (1)

[Claims] 1. A brown rice storage warehouse is provided with a built-in gas-expanded wrapping bag in a space region portion other than the case where brown rice is packed in a breathable bag body such as a hemp bag to reduce the space in the warehouse. An insecticide method for stored brown rice pests that kills brown rice pests in an atmosphere with a vaporized carbon dioxide concentration of liquefied carbon dioxide of 50% or more.