Evaluation of plant products against red spider mite, Tetranychus urticae Koch infesting tuberose

Abstract

Under laboratory conditions, the acaricidal efficacy of aqueous extracts from 15 different plant parts were evaluated against two spotted spider mite, Tetranychus urticae Koch. Among the tested plants, the fruits of Solanum virginianum caused 88.89% adult mortality of T. urticae at 10 per cent concentration on 72 hours after treatment (HAT) with LC50 value 2.56% which was statistically superior to all other treatments. Next to S. virginianum, Polyalthia longifolia, Bougainvillea glabra, Datura stramonium, Tecoma stans, Lawsonia inermis leaves and Carica papaya seeds showed mite mortality of 68.89, 66.67, 64.44, 62.22, 61.11 and 60.00%, respectively which were statistically on par. Further, the aqueous extracts of Argemone mexicana, Lawsonia inermis seeds, Limonia acidissima and Piper betle caused mortality of 55.56, 42.22, 40.00, 40.00%, respectively. Whereas aqueous extracts of Aristolochia bracteata, Eichornea crassipes, Albizia amara and Ziziphus jujuba recorded 36.67, 35.56, 32.22 and 28.89% mortality, respectively. The repellent, oviposition deterrence and ovicidal properties were evaluated and S. virginianum was found to be superior among the screened products with 56.18% repellency, 55.69% oviposition deterrence and 48.89% ovicidal activity.