Efficacy of onion extract and two synthetic acaricides against Tetranychus urticae on soybean in Georgia

Abstract: The paper deals with control of spider mites in the soybean crop in east Georgia. The efficacy of an onion herbal extract and two acaricides, Vertimec and Masai, were studied in field trials. The results showed that the highest mortality (> 99%) ten days after the treatment was caused by Vertimec followed by Masai (98.8%) and the onion extract (75%). Lethal concentration LC50 for Vertimec, Masai and onion extract was estimated to be 0.0083%, 0.0018% and 0.3802%, respectively. Substitution of synthetic acaricides with herbal extracts can be recommended for sustainable agriculture.