vermectin 123

vermectin is a kind of 16-membered ring macrolide compound which was first developed by the Kitasato University in Japan and Merck Company (United States). It has insecticidal, acaricidal, and nematicidal activity. It is produced by the fermentation of Streptomyces avermitilis. Natural avermectin containing eight component with four major components namely A1a, A2a, B1a and B2a with the total content being ≥80%; another four components corresponding to smaller proportion are A1b, A2b, B1b, and B2b with the total content of ≤20%. Currently commercialized avermectin pesticide has abamectin as the main insecticidal ingredient (Avermectin B1a + B1b with B1a being not less than 90% and B1b being less than 5%). It is calibrate by the content of B1a.