Abstract:
Bioassays were conducted to investigate the toxicity and residual activity of botanic and synthetic pesticides against adult female citrus psyllids, Diaphorina citri Kuwayama and second instar larvae of Chrysoperla carnea (Stephens). A dose of 1% neem seed oil inflicted 80% mortality on D. citri and 100% to C. carnea within 48 hours. Neem seed extract at a high dose of 3% resulted in 68.0 and 80% mortality to D. citri and C. carnea, respectively. Addition of 5% sugar to neem oil or neem water extract as feeding stimulant improved toxicity of the product to about 30 and 50%, respectively. Bioassays with synthetic pesticide such as methomyl and imadicloprid inflicted 97-100% mortality to D. citri on day 4, 70% and 34% on day 9 post application. Decline in mortality was gradual in case of methomyl but very quick in imidacloprid and lambda cyhalothrin from 100% on day 1 to 60% and 35% on day 9, respectively. Neem oil and its extract also degraded very quickly and showed decline in mortality from 80 to 20% within 5 days post application period.
Page(s):
197-201
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Zoology, Volume: 44, Issue: 1, Year: 2012