Common chemical control methods of storage pests

1. Parathion: parathion is a preferred grain protectant in the world, its chemical name is methyl pyrimidine (sulfur) phosphorus, and the commonly used dose for the control of stored grain pests is 5ppm.

two。 Grain phosphorus: grain phosphorus is a grain protective agent developed by Chengdu Grain Storage Science Research Institute of the State Grain Bureau. it has a good control effect on stored grain pests, especially suitable for use in rural areas. The ratio of phosphorus consumption of preserved grain to that of raw grain was 1: 2500. That is, each bag of 100 grams of guaranteed grain phosphorus can be mixed with 250 kilograms of raw grain.

When using grain phosphorus, the grain must be dry (in line with the safe moisture standard). And the grain is insect-free or basically insect-free.

3. Insecticidal phosphorus: insecticidal phosphorus is the main agent used to control stored grain pests in rural areas. It is a kind of pesticide with high efficiency, low toxicity and low residue. Insecticidal phosphorus has a long effect, and it is very effective in controlling stored grain pests such as corn elephant, saw grain thief, long horn flat grain thief, wheat moth and so on. Insecticidal is a high-purity malathion used for mixing grain. Pay attention to mixing evenly, and it is best to mix medicine on the sun field before grain enters the warehouse. The insecticidal phosphorus solution of 20ppm can be sprayed evenly on the grain by spraying method. The moisture content of grain should be within the safe moisture standard, that is, the water content should be less than 13%. The mixed use of insecticide and dichlorvos is prohibited, otherwise it will have an increasing toxic effect.

There should be a safe interval of four months after application before it can be processed and eaten.

4. Gaochongjing (grain protective agent)

Gaochongjing is a compound botanical insecticide which is mainly made of 4 kinds of Chinese herbal medicine and mixed with a small amount of chemicals. It has a strong repellent, repellent and contact effect on insect pests. It has the fragrant smell of Chinese herbal medicine. The insecticidal effect is remarkable. The ratio of net drug consumption of grain worm to raw grain is 2500, that is, each bag of 200 grams of bagged powder can be mixed with 400-500 kilograms of raw grain.

5. Aluminum phosphide (fumigant)

Aluminum phosphide tablets are commonly used by farmers to store grain, about 3 grams each. The dosage is generally calculated as 1-2 tablets (3-6 grams) per cubic meter. Generally, 5 tablets are used per ton (1000 kg) of grain. When applying the medicine, put the tablets into a small cloth bag (one piece for each bag). The cloth bag is tied up with a rope and evenly buried in the grain pile to allow the phosphine to be released slowly. Immediately after application, the grain is sealed (pay special attention to the sealing around the bottom) to ensure the effect. After 6 days of fumigation, ventilated and ventilated for 5 days, take out the cloth bag, choose the place away from the water source, dig the pit and bury it in the soil.

The above chemicals are only used as raw grain and seed storage, and do not use finished flour and rice.