Rice diseases and insect pests: what are the diseases and insect pests in the later stage of rice? How to prevent and cure it?

What are the diseases and insect pests in the later stage of rice? How to prevent and cure it? Please introduce in detail the main diseases and insect pests in the later stage of rice: 1. Sheath blight: the recent increase in sheath blight has accelerated, with an average disease rate of 13.7% and a disease rate of 3.3%, which is significantly faster than that of the previous period, especially in Wuyunjing series varieties. sheath blight is generally serious, according to the current temperature and rice growth period, the disease rate and disease plant rate will continue to rise in the near future. 2. The fifth generation of gray planthopper: the population density of gray planthopper has been high this year. The average number of insects in 100 holes is 20.6, and the number of insects in the field is relatively high. In order to lower the cardinal number, reduce the damage degree of rice in the later stage, and reduce the number of insect sources next year, it is necessary to use drugs to control. 3. The fourth generation brown planthopper: the occurrence degree of the second and third generation brown planthopper is moderate in this city, but the threat of the fourth generation brown planthopper still exists. The number of 100 burrow worms in the designated fields of the plant protection station was 24.6 on September 10, and the survey of each town on September 9 showed that the average number of 100 burrows was 7.9, especially in some fields that were not treated according to the prescription, which had a serious impact on the growth of rice in the later stage. 4. The fourth-generation longitudinal leaf roller: at present, the number of eggs in the field of the fourth-generation longitudinal leaf borer is still high. 35 fields were investigated in each town, with an average of 170.4 eggs, 20.4eggs and 150eggs, especially some late-planted direct seeding rice. 5. The condition of rice seedlings is very beneficial to the occurrence of diseases and insect pests. The cultivated rice varieties are all large panicle and round rod varieties, with light green growth, large growth and high degree of canopy closure in the field, which are beneficial to the feeding and oviposition of rice planthopper, especially Wuyunjing varieties, the sheath blight rises rapidly in the later stage. Direct seeding rice and other late-breaking varieties, such as green leaves, long upper functional leaves, late growth period, are very beneficial to the occurrence of Chilo suppressalis. 6. Abnormal temperature is beneficial to the occurrence of diseases and insect pests. Since September, the temperature has been on the high side, and the average temperature in the first ten days of September is 26.0, which is obviously higher than that of normal years. According to the forecast of the meteorological department, the temperature is still high in the middle of September, which creates very favorable conditions for the mass reproduction of the fourth and fifth generations of brown planthopper and the fifth generation of gray planthopper. Rice diseases and insect pests can be controlled with reference to the following methods: 1, medication time: about 10: 00 in the morning, about 3: 00 in the afternoon. 2. The method of drug use: according to the cultivation forms, main varieties and growth process of various places, the classified guidance was carried out to ensure the control effect. The main results are as follows: (1) large area conventional rice. 20 grams of 25% pyrazidone suspension and 400 ml of 5% Jinggangmycin per mu are used to deal with rice planthopper and sheath blight; (2) direct seeding rice, conventional green rice fields and fields with late growth period, 20 grams of 25% pyramidol suspension per mu plus 40% diazine per mu. Phoxim 80 ml plus 5% Jinggangmycin 400 ml, mainly for rice planthopper, longitudinal leaf borer, sheath blight, and 20% Dingfeng Jinggang for some very late fields. Tricyclazole suspension 100g to control neck blast. The above formula is sprayed by small machine with 50ml / mu of water and 60kg / mu, or with "Gongnong 36" with 150kg of water. Especially on August 22-23 and the fields where aphidione was not used, the key points of this medication should be taken. Click to get more rice planting techniques click to get more food crop planting techniques