Prevention and treatment of peanut larvae in peanut field before 3rd instar

User 320721001 Posts: In recent days, the local (Subei) peanut broke out on the bollworm, and the larvae were about 3 years old. The use of 3.2% avermectin (3.2%) per acre, 100% 1% methionine salt, etc. After 4 pm, the control effect is not very satisfactory, and the mortality rate is about 60%. Is there any good way to cure pests?

Cotton bollworm is one of the main pests on cotton. It has a complex diet and a wide range of hazards. Besides harming cotton, it can also harm crops such as peanuts, corn and soybeans.

In the cotton region of the Yangtze River Basin, cotton bollworms occur 4-5 generations a year, and they live in the soil with diapause pupae. The first generation of insects mainly occurs in wheat fields. The second generation of larvae mainly harm the top of the cotton. The third and fourth generation larvae mainly damage the buds, flowers, and bells of cotton, resulting in a large number of buds, flowers, and bells falling off. This has a great impact on cotton yield. . The fourth and fifth generation larvae, in addition to harming cotton, sometimes become the main pests on crops such as corn, peanuts, beans, vegetables, and fruit trees.

In recent years, large-scale application of transgenic insect-resistant cotton varieties, cotton bollworm damage occurred in cotton, but the occurrence of other host crop fields have been increasing year by year. The bollworm is harmed in the peanut field, and the larvae damage the leaves and buds of the peanuts, especially eating buds, affect fertilization and fruit needles into the soil, resulting in a significant reduction in production. After hatching, the larvae feed on the eggshells and then transfer them to the top to feed on the young leaves. The young larvae can spine and bind the unopened young leaves to feed on the leaves, leaving only the leaves of the leaves to become transparent, 3 After age, the damage to the leaves is even more severe, with losses of 15% to 20% and losses of more than 50%. The larvae have the habit of transforming plants, and the transfer time is mostly at night and in the early morning. In the evening, the pesticides are easily exposed to the insects and the control effect is good.

To prevent and treat peanut bollworm in the peanut field, it should be administered when there are 100 eggs in the hundred holes or when the rate of infected insects reaches 5-10%. Since the larvae enter the gluttony stage after 3rd instar, the food intake is large and the leaves can be completely consumed. Therefore, the best time for prevention and treatment is before the 3rd instar. The medicines currently registered for the control of Helicoverpa armigera are fenvalerate, cyfluthrin, beta-cypermethrin, fenpropathrin, bifenthrin, deltamethrin, and other chrysanthemums, profenofos, phoxim, and chlorpyrifos. , trichlorfon, triazophos, acetophos, omethoate and other organic phosphorus, methomyl and other carbamates, and abamectin, emamectin benzoate, fluoride bell Urea, cotton bollworm nuclear polyhedrosis virus, Bacillus thuringiensis, lufenuron, indoxacarb and so on. Due to the long-term use of organic phosphorus and chrysanthemum pesticides to control bollworm, the resistance of bollworm to these two types of drugs has increased and the control effect has declined. In areas with poor control of organic phosphorus and chrysanthemum pesticides, other drugs should be used instead. The avermectin, emamectin benzoate, indoxacarb and other drugs are effective for controlling the bollworm, and have a wide application in production. In addition, chlorantraniliprole, flubendiamide and other drugs have high activity, have strong internal conductivity, and have good control effect on cotton bollworm.

The use of avermectin and emamectin benzoate in the prevention and control of cotton bollworms generally uses 1.5-2 g and 0.4-0.8 g of pure mu, respectively. The above-mentioned fields will use 3.2% avermectin 50ml (equivalent to 1.6g per acre) or 100mg of emamectin benzoate per acre after 4pm (equivalent to 1g/mu of pure drug). ), normal application should be able to achieve good control effect. After the two drugs are applied, the death rate of pests is slower, and it is generally better to check their control effect 4-7 days after application.

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