Rice brown rice borer is a single-feed pest, and its occurrence and growth in the field are closely related to the growth period of rice.
I. Grasping the time of damage Rice brown rice borer is a single-feeding pest, and the occurrence and growth of the field are closely related to the growth period of rice. According to observations, the evolution of the hazards can be roughly divided into four periods: From the time of tillering to the beginning of booting, the number of insects accumulates, the number is small, and the damage is slight; from booting to heading, the amount of insects rises, and when the amount of insects increases sharply, it becomes obvious. Hazard; from grouting to milk-cooking is the peak period of insects, the amount of insects reaches the peak, and often occurs due to lack of control to emerge wearing lodging; wax ripening to the harvest period of insect decline. Therefore, the control should be based on the growth period, based on the amount of insects to determine the time and frequency of rice brown planthopper control. That is, the control of the damage can be controlled by selecting the control at the full heading stage before the increase of the insect amount and the occurrence of the maximum insect amount.
Second, to master the prevention and control indicators Proper control of rice on the rice brown planthopper has a strong ability to withstand the occurrence of a small amount of the field, the growth and development of rice plants are not affected, generally do not need medication control. However, in the year of major outbreak, if the amount of rice is large in the middle period before rice growth, the number of pests in the field should be controlled as early as possible to reduce the occurrence base. In the medium and early stages of rice growth, prophylactic use is generally controlled at a rate of 500 animals per 100 feet, which means that there is an average of about 5 per plant; in the middle to late period, the control index is generally 1,000 per plant, that is, 10 per plant. Left and right; rice not far from the harvest period, stalk tissue aging, a strong ability to withstand damage, control indicators can be appropriately relaxed, drug control of rice planthoppers, generally required in the nymph during the peak incubation period, when the concentration of pesticides used, and Sensitive to pesticides. Short-lived pesticides such as dichlorvos and chlorpyrifos can also rapidly kill brown rice borers in large numbers, reducing the population to levels that are not sufficient to cause harm.
Third, the rational use of pesticides can consider the use of some effective counterparts of pesticides, at present, there have been some effective new drugs that come out of the brown planthopper. Such as Aktai (25% Thiamethoxam water dispersible granules), the general amount of 2 to 4 grams per acre, spray 50 to 60 kg of water. 20% Ether Chrysanthemum Emulsion, the dosage per acre is 45-55 ml, spray 50 kg water. Good wolfberry (25% thiophene. Different WP), good phlegm (25% thiophene. iso-emulsion), generally the amount of 70 ~ 100 grams of mu, spray 50 kg of water. The amount of 25% pymetrozine WP is 25-30 grams per mu, and 40-50 kg of water is sprayed with good effect.
If the amount of insects rises sharply, late stabilization of the brown planthoppers in the later stages of the season should pay particular attention to increasing the amount of water. Normally, use hand sprayers to spray water. The amount of water per mu must reach 50-60 kg; the amount of water per mu should be over 40 kg with a mist sprayer. This can spray the liquid to the base of the rice plant to improve the control effect. And to ensure that the field maintains a 3 to 5 cm water layer, brown planthoppers that are knocked down by high-concentration drugs will be drowned and can improve the control effect.
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