According to the field survey, combined with the recent weather conditions and historical data, it is estimated that the overall incidence of diseases and insect pests in the middle and late stages of early rice in Nanning City is medium to light and moderate.
First, the trend of major diseases and insect pests
1. Rice planthopper. It is expected that the moderate local bias will occur in an area of 550,000 mu, which is common in the city; the peak period is from June to early July, of which the peak period is mid-June. By May 20, the number of insects under the lamp was small, and the highest number of insects in a single day was 129; in the early field survey, the density of insect populations in the fields was generally 90 to 180 heads/100 bushes, and the high was 600 to 2200 heads/100 bushes. The weather forecast is that there will be more rainy days in June, which is conducive to the continuous migration of insect sources from other places.
2. Rice longitudinal curl leaf borer. It is expected that moderate to mild occurrence will occur in an area of 220,000 mu, which is common in the city; the peak period of occurrence is mid-June. In the preliminary survey, the average leaf roll rate in the field was about 0.5%; the larvae were generally 8 to 10 heads/100 bushes, and the high was 60 to 100 heads/100 bushes; the average amount of eggs in the field was 3330 grains/mu, and the high was up to 10000 grains/mu. Meteorological forecasts have more rainy days in June, which is conducive to the continuous migration of insect sources from other places.
3. Rice blight. It is expected that the moderate local bias will occur in an area of 800,000 mu, and the disease epidemic will be in mid-to-late June. According to local surveys, the average plexus rate is 2%, and the high rate is 20% to 40%. In June, the weather was hot and rainy, and the disease was easy to spread.
4. Spike-necked plague. It is expected that the occurrence of panicle neck plague is moderate to mild, with an area of about 150,000 mu. The occurrence of leaf blast in the early stage was mild, mainly due to the severe occurrence of individual disease-susceptible varieties, and the diseased leaf rate was the highest 43.6%, with an average of 0% to 16.2%. It became endemic during the large-scale fetal rupture period of rice, mainly in historical occurrence areas and planting areas of susceptible varieties.
5. Rice borer. Light occurrence, occurring in an area of about 100,000 acres. There are mainly dihua borer, Taiwan rice borer, large borer, of which the dihua borer as a pest shows an upward trend, according to local surveys, the average insect injury plant is 1.1% to 1.5, the highest 3.5%.
6. Southern rice black-striped dwarf disease. Light occurrence, the occurrence area of about 10,000 acres. At present, no harmful conditions have been found in the field, and some plots are neglected to control, and it may occur in the later stage.
In addition, rice aspergillosis, rice bacterial stripe disease, and rice white leaf blight also occur to varying degrees in local rice areas, and all localities should pay attention to prevention and control.
II. Opinions on prevention and control
1. Strengthen field monitoring and early warning, accurately grasp the dynamics of disease and insect occurrence, timely release of disease and insect forecast information, formulate prevention and control strategies and prevention and control plans, and provide scientific decision-making basis for the government.
2. Focus on the prevention and control of major diseases and insects in the middle and late stages of rice, such as rice planthoppers and rice blight, and treat and provoke the treatment of rice longitudinal leaf borers to reduce the accumulation of pathogens, and at the same time, according to the occurrence and characteristics of diseases and insects in the region, clarify the main targets of attack in various places, and classify and guide the masses to carry out standard prevention and control and emergency prevention and control.
3. For key areas, actively promote unified prevention and control and mass prevention and mass governance during critical periods, improve the effectiveness of prevention and control, and achieve the goal of reducing and controlling harm.
4. It is recommended to use effective prevention and treatment agents with high efficiency and low toxicity. Rice planthopper can choose imidacloprid, pyrithopridone, thiamethoxine, acetylpyridine, thiazinone, etc., rice curl borer can choose chlorhera benzamide, thuringiensis, metamid avermectin benzoate, chlorpyridoxine benzoate, chlorpyrifos, etc., spray control at the peak of young (if) insects; striated blight can choose wellgangmycin, Bacillus subtilis, benzyl propycrazole, etc., spray control in the early stage of the epidemic of disease; rice blast can be sprayed with rhycomycin, tricyclazole, etc., and spray control from the fetal rupture stage to the panicle stage.
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Source: Text/Nanning Plant Protection Station Photo/Propaganda Department of Nanning Municipal Committee of the Communist Party of China, Office of Nanning Spiritual Civilization Construction Committee, Comprehensive Finishing
Editor: Nanning Agricultural Information Center
Legal counsel unit: Guangxi Fayan Law Firm
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