Chemical name: methyl (e)-2 {α-[2- isopropoxy -6- (trifluoromethyl) pyrimidine -4- yloxy]-o-tolyl }-3- methoxyacrylate.
Main physical and chemical properties: pure product is a white solid with melting point of 107.2 ~ 108.6℃. The relative density is 1.276(20℃). The vapor pressure is 2.690-6Pa(20℃). Solubility (g/L, 20℃): water 3.440-6, dichloromethane 579, acetone 278, toluene 192, xylene 1 9, acetonitrile 287, ethyl acetate 232, methanol 27. 1 9. Stable to heat (200℃). Pyrimethamine is a low toxic product, but it is highly toxic to fish. Mitochondrial respiratory inhibitor. Block the electron transfer between cytochrome b and c 1 It is mainly used to control many kinds of mites on apple, citrus, pear and other fruit trees.
2. Spirodimethyl ester.
Chemical name: 3- (2,4,6-trimethyl) phenyl -2- oxo-1- oxo-spiro (4,4) -3-ene -4- yl-3,3-dimethylbutyrate.
Main physical and chemical properties: pure product is colorless powder with melting point of 98℃. The vapor pressure is 70-6Pa(20℃). The solubility in water is 0. 1.3 mg/ml. Partition coefficient (n-octanol/water): 4.55 (pH 2 ~ 7.5, 20℃). The soil degradation time is 5 days. There is no soil fluidity. Acute oral LD50 of rats > 2500mg/kg (female and male); Acute percutaneous LD50 of rats (female and male) is more than 2000 mg/kg; The median lethal concentration of acute inhalation in rats is > 4873 mg/m3. No irritation to rabbit skin (4h) and rabbit eyes (24h); The chronic toxicity of dogs (65438+February) has a NOAEL of 50 mg/L; The acute toxicity LD50 of birds is more than 2000 mg/kg, and the LC50 of earthworms is more than 1000 mg/kg (dry soil); The oral LD 50 of bees is more than 790 micrograms per bee, and the LD 50 of bees is more than 200 micrograms per bee. Non-toxic to ladybugs; It is slightly harmful to carnivorous mites. The mechanism of spirotetramat is to inhibit the fat synthesis in mites, destroy the energy metabolism of mites and interfere with the biosynthesis of their liposomes, especially in the larval stage. At the same time, it can also produce ovarian tube closure, reduce the reproductive ability of mites and whitefly adults and greatly reduce the amount of eggs laid.
3. hexythiazox (nisolang).
Chemical name: 5-(4- chlorophenyl) -3-(N- cyclohexylcarbamoyl) -4- methylthiazolane -2- one.
Main physical and chemical properties: pure product is colorless crystal. Slightly soluble in water, soluble in methanol and acetone and soluble in chloroform. Stable below 300℃. Hydrolyze in acid-base medium. The acute oral LD50 of rats and mice is more than 5000mg/kg. It is a non-systemic acaricide, which is effective for all mites. Quick-acting and long-lasting
4. propargite (propargite).
Chemical name: 2-(4- tert-butylphenoxy) cyclohexylpropyne -2- sulfite
Main physical and chemical properties: the original drug is a black viscous liquid with a relative density of1.085 ~1.115, a flash point of 28℃, a vapor pressure of 400Pa at 20℃ and a solubility of 0.5mg/L in water at 25℃. Flammable, soluble in organic solvents, not mixed with strong acids and alkalis. Under normal circumstances, it will not deteriorate for at least 2 years. Low toxicity. Rats were given LD502200mg/kg orally. The acute inhalation LC50 of rats is 2.5 mg/L, which has contact toxicity and gastric toxicity, and has no systemic and osmotic conduction. It is effective for adult mites and nymph mites, but its ovicidal effect is poor.
5. pyridaben (pyridaben).
Chemical name: 2- tert-butyl -5-(4- tert-butylbenzylthio) -4- chloro -2h- pyridazine -3- one.
Main physical and chemical properties: pure product is white crystal and tasteless. The melting point is11~112℃, and the vapor pressure is 253.30-6Pa at 20℃. The solubility at 25℃ is 1.20-6g/ 100mL in water, 39g/ 100mL in xylene, 19g/ 100mL in toluene and/kloc-0 in benzene. Acute oral LD506 1350mg/kg, acute percutaneous LD 50 > 2000 mg/kg, and acute inhalation of LC 500.62 mg/L have no irritation to rabbit skin, but slight irritation to rabbit eyes. Low toxicity to birds, high toxicity to fish, shrimp and bees. The half-life in soil is 12 ~ 19d, and the photolysis half-life in soil is 4 ~ 6d. The photolysis half-life in water is less than 30 minutes. It is a new type of quick-acting broad-spectrum acaricide with strong contact toxicity and no internal absorption, conduction and fumigation. It has a good effect on the growth stages of Tetranychus urticae (eggs, young mites, nymphs and adults); The control effect on rust mites is also good. Quick-acting, good duration, generally up to 1 ~ 2 months.