Acephate, also known as high-killing phosphorus, was discovered by Dr. JM Grayson in the United States in 1972. It is an insecticide that is a highly effective, low-toxic, and broad-spectrum organophosphorus insecticide. , Contact, fumigation and egg killing. The gastrotoxic effect on lepidopteran pests is greater than the contact toxicity, and the contact speed on aphids and mites is slow, and the contact toxicity is generally exerted 2-3 days after application. The residual period is moderate, and the half-life in soil is three days. Its mechanism of action is to inhibit cholinesterase in insects. Acephate can be maintained on the leaves for 10 to 15 days, and it is good for the main pests of rice, wheat, cotton, corn, vegetables, beans, fruit trees, sugar cane, tobacco, pasture, tea and other crops. Prevention effect. Mainly control rice planthopper, leafhopper, thrips, leaf roller borer, borer, cotton weevil, cotton bollworm, fruit tree borer, cabbage worm, diamondback moth, silverworm and various aphids, armyworm, etc. . If it is mixed with pesticides such as carbaryl and dimethoate, it has synergistic effect and can increase the duration of maintenance.
1. Rice pests:
(1) Control rice stem borer, apply pesticides at the peak of egg hatching, use 40% Acephate emulsifiable concentrate 2.5～3L/hm2, add water to spray; the effective period is about 5 days.
(2) Prevention and control of white ears caused by rice borer, from rice breakage to full ear stage, using 40% emulsifiable concentrate 2.5～3L/hm2, spraying with water, the control effect can reach about 95%. In cases, the borer damage rate can be controlled below 0.3%. However, when the borer has a long occurrence period and the rice heading is not regular, the second application should be carried out 5 days after the first application. Because methamidophos has no contact toxicity to the borer, and the effect period is short, it has a poor control effect against borer caused by borer and is generally not suitable for use.
(3) Prevention and control of rice leaf roller borer, rice tillering stage, the amount of 2 to 3 instar larvae worms is 45 to 50, and the leaf damage rate is 7% to 9%; booting stage, 2 to 3 instar larvae worms 25 to 35 heads, with a leaf damage rate of 3% to 5%, use 40% Acephate emulsifiable concentrate 2 to 3 L/hm2 and spray 900 to 1000 kg of water.
(4) Prevention and control of rice planthoppers, heading stage of rice booting, peak period of 2-3 years old nymphs, 1300 head of nymphs; milk maturity period, peak period of 2-3 hours old nymphs, when the amount of worms is 2100, use 30 % EC 1.5-2L/hm2, spraying 900-1000kg of water; also has good curative effect on rice leafhoppers, rice thrips, etc.
2. Cotton pests:
(1) Controlling cotton aphids and spider mites, using 40% emulsifiable concentrate 1.5L/hm2, spraying 800-1000kg of water, the control effect rises slowly within 2 to 3 days after application, and the control effect can reach 90% within 5 days after application the above. The effective control period is 7 to 10 days.
(2) To prevent and control cotton weevil and cotton stink bug, use 40% Acephate emulsifiable concentrate 0.75～1.5L/hm2 and spray 800～1000kg of water at the initial stage of damage to the two insects.
(3) To prevent and control cotton bollworm, use 40% Acephate emulsifiable concentrate 3~4L/hm2 during the egg hatching period of 2~3 generations, spray it with 1000~1500kg of water, the effective control period is about 7 days. However, the control effect on cotton bollworm is poor, so it is not suitable for use.
Post time: Jun-29-2020