Control of rice diseases and insect pests: how to control rice planthopper?

How to control rice planthopper? What harm does rice planthopper do to rice? Please introduce the harm of rice planthopper to rice: Rice planthopper is a frequent pest that seriously harms rice. At the initial stage of damage, there are many irregular brown spots on the stem, and when the damage is serious, the whole plant wilts and gradually expands into pieces; rice is damaged at booting stage and can not heading. After heading, it affects the plumpness of rice, reduces the weight of 1000 grains, and has a high rate of shrunken grain. The occurrence period of rice planthopper: generally, rice planthopper can occur from early rice seedling field to early October. There were two nymph peaks in early rice, the first from late May to early June, the second from late June to early July, the first nymph peak from mid-late June to early July, the second from mid-late July to early August, the first nymph peak in late rice from mid-late August to late September, and the second from mid-late September to early October. Generally, after transplanting double late rice, it is from late July to early August, and the number of rice planthopper is abnormal, which needs to be controlled in a large area. The white-backed planthopper accounted for more than 70% of the total in the peak period of the main damage generation, and white-backed planthopper was dominant in the early stage of late rice, and then the proportion of brown planthopper increased, up to 70% of the total planthopper. The reasons for the disease of rice planthopper are as follows: 1. Climatic factors-the average temperature in mid-late August is lower than 2-3 ℃, and the temperature in mid-late September is higher than that in previous years, while rice is in the peak tillering stage to booting stage, rich food conditions and hot and humid climate are very beneficial to the occurrence and damage of rice planthopper. 2. the factors of daily control-farmers can inhibit the growth of rice planthopper to a certain extent while controlling other pests such as Chilo suppressalis; on the other hand, because farmers are relatively independent and dispersed, the differences in the types and times of drug use also affect rice planthopper. Rice planthopper control methods: 1. Rice variety control methods-selecting hybrid rice combinations such as Weiyou 191, Ⅱ you 6078 and Guofeng 1 can get twice the result with half the effort in controlling the damage of rice planthopper. 2. Fertilizer application method-pay attention to the rational application of nitrogen, phosphorus and potassium, re-apply base fertilizer, apply fertilizer early, control the overgrowth of seedlings, improve the insect resistance of rice, and create a rice field environment that is not conducive to the occurrence of rice planthopper. 3. The method of eliminating the overwintering insect source-the insect eggs overwintered in the stems of Gramineae weeds beside the fields, ditches and ponds, and combined with fertilizer in winter to eradicate the weeds beside the fields and ponds to eliminate the overwintering insect sources. 4. Use the method of natural enemies-to reduce the use of pesticides in the early stage of rice field, and try not to use chemical pesticides that are lethal to natural enemies. 5. Pesticide prevention and control method-sufficient amount of water should be applied to ensure that the lower part of the rice plant is drenched with the liquid, and the shallow water layer in the field is about 6 cm, so as to improve the control effect. Low-toxic and low-residue pesticides such as Prochloraz or Zhuang'ai are generally used. Click to get more rice planting techniques click to get more food crop planting techniques