Avermectin B1(abamectin) is an very effective acaricide/insecticide. Avermectin B1 is a mixture of avermectins containing avermectin B1a and avermectin B1b. These two components, B1a and B1b have very similar biological and toxicological properties. The avermectins are insecticidal and antihelmintic compounds derived from various laboratory broths fermented by the soil bacterium Streptomyces avermitilis. Avermectin B1 is a natural fermentation product of this bacterium.

[1] De Chaneet GC, Casey R, Dixon FF, Besier RB, Mitchell RK. Effect of avermectin B1 and benzimidazole anthelmintics on worm egg output of treated cattle. Aust Vet J. 1988 Mar;65(3):85-6.

[2] Murty US, Jyothi KN, Jamil K. Effect of avermectin B1 (L-676) a metabolite from Streptomyces avermilitis on immatures of Culex quinquefasciatus. Indian J Med Res. 1987 May;85:539-41.

[3] Parrish MD, Roberts RB. Toxicity of avermectin B1 to larval yellowjackets, Vespula maculifrons (Hymenoptera: Vespidae). J Econ Entomol. 1984 Jun;77(3):769-72.