Cas:71751-41-2 Avermectin powder
| product name |
Avermectin |
| cas number |
71751-41-2 |
| apperance |
white powder |
| Density |
1.2±0.1 g/cm3 |
| MF |
C95H142O28 |
| MW |
1732.13 |
Abamectin is a type of sixteen-membered macrolide compound with insecticidal, acaricidal and nematicidal activities first developed by Omura Tomo from Kitasato University in Japan and Merck in the United States. It is fermented by Streptomyces avermitilis from Streptomyces griseus. produce. Natural abamectin contains 8 components, there are mainly 4 kinds, namely A1a, A2a, B1a and B2a, the total content of which is ≥80%; the corresponding 4 smaller proportions of homologues are A1b, A2b, B1b and B2b , Its total content is less than or equal to 20%. Currently commercially available abamectin pesticides are based on abamectin as the main insecticidal ingredient (Avermectin B1a+B1b, where B1a is not less than 90%, and B1b is not more than 5%), and is calibrated by the content of B1a.
The appearance is pale yellow to white crystalline powder, tasteless. m.p.155~157ºC, vapor pressure 2×10^-7Pa, relative density 1.16(21ºC). The solubility at 21ºC is: toluene 350g/L, acetone 100g/L, isopropanol 70g/L, chloroform 25g/L, ethanol 20g/L, methanol 19.5g/L, cyclohexane 6g/L, kerosene 0.5g/ L. Water 10μg/L. The distribution coefficient is 9.9×10^3. It is stable under normal conditions and will not be hydrolyzed at pH 5-9.
Abamectin has stomach toxicity and touch killing effect on mites and insects, and cannot kill eggs. The mechanism of action is different from general insecticides in that it interferes with neurophysiological activities and stimulates the release of γ-aminobutyric acid, which has an inhibitory effect on the nerve conduction of arthropods. Adults, nymphs and insect larvae of mites will appear paralyzed after contact with abamectin, do not move, do not feed, and die after 2 to 4 days. Abamectin has a slower lethal effect because it does not cause rapid dehydration of insects. Although avermectin has direct contact and killing effects on predatory insects and parasitic natural enemies, it does little damage to beneficial insects because of the few residues on the plant surface. Abamectin is absorbed by the soil and will not move, and is decomposed by microorganisms, so it has no cumulative effect in the environment and can be used as a component of comprehensive prevention and control. It is easy to prepare, and the preparation can be used after being poured into water with a little stirring. It is also safer for crops and will not cause phytotoxicity when used according to the method introduced. Applicable crops Vegetables, citrus, cotton, etc.
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