Use pesticides to control rice pests
Promotion of biological control, biological pesticides 1. Methods for the prevention and control of pesticides in rice fields and pests 1. Coordination of rice and horses during the transplanting period of seedlings. The rice locusts occur in the paddy field and are brought into the field by transplanting, which often causes damage to the rice plants in the tillering stage. In the past, the cost of controlling horses in Daejeon was relatively high, and the killing of natural enemies was serious, which did not meet the principle of coordinated prevention and control. If the carbofuran is applied before the seedling is transplanted before the transplanting in Putian, the characteristics of long-term inhalation and long-lasting effect can be used to keep the seedlings from being harmed by the thrips within one month after transplanting. This method of application has little effect on rice field spiders and stag beetles. If the seedling stage is not treated with carbofuran, after transplanting field by Thrips, available Bisultap, Kuaishaling, EC Ma Ju and other pesticides to control them better results than dimethoate or other organic pesticides, and because of The influence of natural enemies is small.
2. The types of drugs used in the prevention and treatment of pests in the medium term. In the prevention and control of medium-term pests in mid-season, the pesticides that control the effects of rice leaf roller, rice stem borer, and stem borer are more than 90%: 100 grams of Bt emulsifiable concentrate, 30 grams of insecticide, or insecticide. 50 grams of triazophos 75 grams, with Bt emulsifiable concentrate added insecticidal effect. After the middle season of rice, the leaves are blocked, and the spray application method can greatly reduce the killing of the middle and lower natural enemies, which is beneficial to the survival and reproduction of natural enemies.
3. The types of drugs used for coordinated pest control in the later period. With 25% of chlorpyrifos WP, spray 30--30 grams per acre of water to 75 kilograms, the control effect of rice planthopper can reach more than 90%. The drug has a strong knockdown effect, and the efficacy lasts for about one month. It does not affect the efficacy due to the low temperature at the end of autumn. It has little killing power to natural enemies such as spiders and is better than other organophosphorus pesticides. In summary, the measures for coordinated control of mid-season rice pests are: carbofuran treatment of soil before sowing in the field, or use of insecticidal double, chlorpyrifos, chrysanthemum emulsifiable concentrate, etc. in the field seedling stage; tillering stage Bt emulsifiable concentrate combined with insecticidal mono- or triazophos was used to control rice leaf roller, rice stem borer, stem borer, rice borer, etc.; during the heading stage, the planthopper was used to control rice planthopper.
II. Occurrence of Insect Pests and Natural Enemies In the case of single-season mid-season rice grown in the middle and lower reaches of the Yangtze River, the main components of pests in recent years are: early stage, from May to June, sowing to the seedling stage Mainly; in the medium term, from July to August, from tillering to booting stage, the rice leaf roller and the rice stem borer are mainly composed of certain rice stem borer and rice borer, causing leaf damage, dry heart and dead sheath; In the later period, between September and October, the heading and filling stage was dominated by rice brown planthopper, whitebacked planthopper and rice leafhopper, which affected the fullness of the grain or caused the plant to fall over.
The natural enemy system in the rice field is a huge group. They can be divided into two main categories: one is the predatory natural enemies, and the number of spiders accounts for 70%-80%. They have a good control effect on the planthoppers and spider mites in the middle and late mid-season rice. In the case of 1:5, the hazard can be completely controlled. The other type is a parasitic natural enemy, mainly a species of the genus Hymenoptera, in which the role of the egg parasitoid is dominant. For example, Trichogramma has a good control effect on the eggs of Cnaphalocrocis medinalis. Generally, the parasitic rate of the first and second generations is 10%-20%, and the parasitism rate of the third and fourth generations is 40%-50%. 80%; the parasitic rate of larval parasitic wasps (such as the larvae of the larvae of the larvae, the larvae of the mites) can reach about 20%. The parasitic rate of the late rice planthopper, nematode and nematode sometimes reaches 40%-50%. The parasitic rate of the parasitic flies in the flood season is also relatively high. It is estimated that under normal circumstances, the comprehensive control effect of pest eggs, larvae and pupa can reach 50%-80%?%8 control effect, generally the parasitic rate of the first and second generation is 10%-20%, parasitic of the third and fourth generations The rate is 40%-50%, and in some years it can reach 80%; the parasitic rate of larval parasitic wasps (such as the larvae of the larvae, the mites) can reach about 20%. The parasitic rate of the late rice planthopper, nematode and nematode sometimes reaches 40%-50%. The parasitic rate of the parasitic flies in the flood season is also relatively high. It is estimated that under normal circumstances, the comprehensive control effect of pest eggs, larvae and pupa can reach 50%-80%.
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