At present, most of the late rice in our city is in the mouth breaking period to the panicle extraction stage. Affected by the dry weather some time ago, rice borers and tarsal mites have occurred to varying degrees in some counties and districts, and they are currently in the right period for prevention and control. All localities must do a good job in the prevention and control of rice borers and tarsal mites to ensure the safety of late rice production.
Dynamics
Fourth-generation rice borer: the field is dominated by dihua borer and Taiwan rice borer, and the situation in the early stage: the rate of dry heart and insect injury plants in Binyang County is the highest 3.3%, with an average of 0.8%, which is heavier than that of the same period last year; the highest number of insect injury plants in Wuming District is 24%, with an average of 8%, which is slightly higher than the same period last year; the number of larvae in the field in Mashan County is 28.3 heads/mu, with an average of 5.3 heads/mu; the maximum amount of residual insects in Hengzhou City is 60 heads/mu, generally 4 heads/mu.
Rice tarsal mite: the insect body is small, hidden for the damage, no obvious symptoms in the early stage, the later severe period of the entire leaf sheath outer wall all turn black brown, the ear stem of the affected rice plant is curved, the shell of the shell is also brown, the ear is not grouted, there is more grain, the rice ear is not hooked. Since August, the high temperature and drought weather in our city has continued, and it is expected that the incidence of the insect will be heavier than in previous years, with an area of about 300,000 mu.
Preventive opinions
Rice borer: Spraying methoxyhydrazide, chlorhexabenzamide, chlorpyrifosum, chlorpyrifos, avermectin, thuringiensis, methammeric acid benzoate and other agents at the beginning of egg hatching or when the wilt rate reaches 3%. Biopesticides can be mixed with low-toxicity chemical pesticides, and agents with good egg killing effect can be mixed with agents with good larval killing effects.
Rice tarsal mite: optional insect mites, avermectin, azalemate, pyridoxine and other acaricides can be sprayed for control in the gestational spike and rumination stage. The amount of water used during application is 60 to 100 kg.
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Source: Text/Nanning Plant Protection Station, Photo/Nanning Agricultural Information Center, Office of Nanning Spiritual Civilization Construction Committee
Editor: Nanning Agricultural Information Center
Legal counsel unit: Guangxi Fayan Law Firm
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