At present, the southern and Jiangnan mid-season rice and the southwestern and northeastern single-cropping rice are in the stage of filling to harvest, the double-cropping late rice in South China and Jiangnan are in the tillering to booting stage, and the single-cropping late rice in the middle and lower reaches of the Yangtze River is in the booting to breaking heading stage. On September 7, the Pest and Disease Monitoring Office of the National Agricultural Technology Center predicted that due to the large number of insect sources in the early stage and frequent typhoon activities in the recent period, the population of rice planthoppers under the lights and in the fields in most southern rice areas is relatively high. The central part, the middle and lower reaches of the Yangtze River, and the Jianghuai rice area have obvious trends. The rice area in eastern South China is heavy to large At present, the area of ​​mid-late rice planthopper occurrences nationwide is 105 million mu, an increase of 17% and 10% over the same period of last year and the average of the same period in the past five years; the overall occurrence is moderate (level 3), in eastern South China, central Jiangnan and the middle and lower reaches of the Yangtze River The rice area tends to be heavy to large occurrences (grades 4 to 5). Since mid-August, the number of insects under lamps in most rice areas in southern China has been higher than normal. According to the monitoring of 217 stations in the national rice disease and insect monitoring regional stations, from August 11 to September 2, a total of 430,000 rice planthoppers were trapped under the lamp in the southern rice area, of which brown planthoppers accounted for 61%. During this period, the average number of rice planthoppers per lamp per day in eastern South China, the middle and lower reaches of the Yangtze River, and the Jianghuai rice area was more than 5 times that of the same period last year, and was 1.2 to 4 times the average for the past five years. In the southeastern coastal rice area, a peak of lamp traps dominated by brown planthoppers appeared. Affected by the typhoon "Mesaq", from late August to early September, there were peaks of attracting insects of more than 10,000 in the southeast coastal rice areas of Fujian, Guangdong, and Zhejiang, and the proportion of brown planthoppers was high. For example, from August 27 to September 2 at 19 monitoring points in Fujian, the average single-lamp single-day trapping amount reached 1497, and the proportion of brown planthoppers was 60%. From August 28 to 29 in Dapu, Guangdong, the total number of single lamp traps was 14,688, and the proportion of brown planthoppers was 40.7%. According to the prediction of the National Climate Center, the temperature in the southern rice area is close to normal to the same period of the year to high. Among them, the temperature in northeastern Guangdong and other places is 1-2 ℃ higher. Suitable temperature and regional rainfall will promote the occurrence of rice planthoppers and the damage period. extend. In the next 10 days, there will be frequent typhoons in the South China Sea or the Northwest Pacific. It is expected that in the next stage, rice planthoppers will have a high risk of occurrence in areas with a large insect source base, a high proportion of brown planthoppers, and suitable host growth periods, such as the southern China, Jiangnan double-season late rice area, the middle and lower Yangtze River and the Jianghuai single-season late rice area. Brown planthopper is the worst damage to late rice Rice planthoppers damage rice and other crops by sucking plant sap. Common planthoppers include white backed planthoppers, brown planthoppers and Laodelphax striatellus. Adults have phototaxis and green tendency. White-backed planthopper is a dominant population of planthoppers in early rice fields and early evening fields in southern double-cropping rice fields. It is sensitive to nicotinic insecticides and is a migratory pest that can also transmit black-streaked dwarf disease. Laodelphax striatellus is a transmission vector of black-streaked dwarf disease and striped leaf blight virus disease in one night and two night fields. The adult and nymph suck the juice of hosts such as rice and cause yellow leaves or leaves to die. When the damage is light, the rice yield will be reduced by 20% to 30%, and when the damage is severe, it can reach more than 50%, or even no grains will be harvested. In addition, Laodelphax striatellus can also transmit rice brown streak dwarf disease and stripe leaf blight, as well as vector insects that spread wheat bush dwarf disease and corn rough dwarf disease. The brown planthopper is one of the most serious pests of one-season rice and late rice. It is a migratory pest, and typhoons are the main transmission vectors. Adults and nymphs of the brown planthopper cluster in the lower part of the rice clump to suck the juice; when the female lays eggs, the ovipositor punctures the leaf sheath and leaves, which easily causes the rice plant to lose water or become infected with sclerotinia disease. The excrement is often proliferated by mold-causing fungi, affecting the photosynthesis and respiration of rice. In severe cases, the rice plants will wither. It is commonly known as "cracking through", "overhead" or "collapsed ring", and in severe cases, there is no harvest of particles. Combination of persistent and quick-acting agents According to the habit of rice planthopper clusters sucking juice at the base of rice clumps, the prevention and control strategy of "prevention and control, prevention first, comprehensive prevention and control" is adopted. Farmland spiders and A. lucorum are natural enemies of planthoppers. A. lucorum sucks planthopper eggs, and spiders prey on active planthoppers. Low-toxic and high-efficiency pesticides can be used in production to reduce damage to natural enemies. Plant soybeans to provide habitat for natural enemies. The insect eggs overwinter in the stalks of gramineous weeds beside the fields, ditch and ponds. In winter, combined with the accumulation of manure, weeds beside the fields and ponds are eliminated to eliminate the source of overwintering insects. In the tillering stage, jointing booting stage, and filling stage, field investigation and monitoring of planthoppers should be done effectively, and timely warning should be given. Rice planthoppers are piercing and sucking mouthparts pests, which are harmful by sucking juice at the base of the mouth needle. Therefore, when choosing a drug, you should choose a drug with strong systemic absorption to facilitate the absorption and conduction of the drug in the rice plant; at the same time, the rice planthopper Adults and nymphs inhabit the relatively sheltered space at the base of the rice plant, and the air circulation is slightly poor, which is conducive to fumigation and insecticide. Therefore, the fumigation agent has a better effect; of course, the contact effect is also important, and it can be effective by directly contacting the insect body. ; Comprehensive considerations, in the selection of rice planthopper medicaments, one with strong systemic, contact killing and fumigation effects should be selected, and quick-acting and long-acting medicaments should be combined. After the occurrence of prevention and control, two combinations should be made, namely, the combination of sustained effect and quick-acting agents, and the combination of coarse water spray and dichlorvos. Long-acting agents can be buprofezin, nitridine·pymetrozine, dinotefuran, dinotefuran·pymetrozine, etc., and quick-acting agents can be chlorpyrifos, dichlorvos, nitenpyram, etc. . Disclaimer: Some articles on this website are transferred from the Internet. 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