Chinese common name: Difenphos. Other names: Kewen Powder.
Physical and chemical properties: Difenphos has the meaning of thiophenol, is difficult to dissolve in water, and is easily soluble in methanol, ether, imitation, acetone, xylene, benzene and other organic solvents. Solubility in water is 5 mg/L. It is relatively stable in neutral solution. It easily breaks down when exposed to alkali or strong acidic substances.
Toxicity: According to my country’s pesticide toxicity classification standards, difenphosate is a moderately toxic fungicide. Crude oil male rat acute oral Lll50 340 mg/kg.
Features:
Difenphos is an organophosphorus diacetyl fungicide. It has an inhibitory effect on chitin synthesis and lipid metabolism of Magnaporthe oryzae.
First, it affects the formation of cell walls.
The second is to destroy the structure of cells, the latter is primary, and the former is indirect.
Control objects: It has good preventive and therapeutic effects on rice blast, and it also has good preventive and therapeutic effects on rice sheath blight, flax leaf spot, sclerotinia, drab blight, millet blast and corn large and small diseases. It has good control effects on leaf spot and wheat scab. It has certain control effect on planthoppers, leafhoppers and lepidopteran pests.
Instructions for use
To prevent and control rice diseases and rice leaf blast, spray 111 ml of 30% dipyfenphos emulsifiable concentrate and 50 kg of water. Seriously diseased fields were sprayed for the second time after 7 days.
To prevent and control rice panicle blast, spray 30% dipynophos emulsifiable concentrate 133 ml of water and 50 kg of water per acre. Mildly diseased fields are generally controlled at the breaching stage of rice, while severely diseased fields should be sprayed once each at the breaching stage, peak heading stage and full heading stage.
To prevent and control rice sheath blight, spray 80 ml of 30% difenphos emulsifiable concentrate and 60 to 75 kg of water per acre.
To prevent rice bacterial blight and flax leaf spot, spray 100 ml of 30% difenfos emulsifiable concentrate and 50 kg of water per acre.
Notes
1. Difenphos cannot be mixed with lime sulfur mixture, Bordeaux liquid, sodium pentaphene, propanil, or benzopyrazole, nor can it be used before applying propanil Or use it within 10 days to avoid phytotoxicity.
2. The interval between the last pesticide application and crop harvest is 21 days. Difenphos should be used no more than 4 times per rice season.
Special reminder:
Difenphosate is a pesticide approved by the Ministry of Agriculture for the prevention and control of rice blast. It can quickly control the occurrence of rice blast. It is a moderately toxic fungicide that can be used under high temperatures and It is easier to cause poisoning when used in wet climate conditions, so be sure to follow the following precautions during use:
①Be sure to wear protective clothing, masks, and gloves before preparing medicine and spray. Avoid contact with the skin
②. Spray before 10 a.m. and after 4 p.m. Do not spray in hot weather
③. During the dispensing and spraying process During the treatment, only eating and smoking
④. Do not re-spray calcium hydrophosphate for too long. If it exceeds two hours, you must rest in a fresh air place for 15 to 20 minutes.
⑤. Do not mix difenphos with insecticide single, insecticide double, fenithide and other nereid poisons.
⑥ If the liquid splashes into your eyes, rinse immediately with plenty of water. After applying the drug, wash your hands, face and other body parts that come into contact with the drug with soap and plenty of water. Amine site!
⑦ If you feel uncomfortable during or after use, go to the hospital for treatment in time.
⑧, the special antidote is [atropine]
