Abstract:
A study was conducted in the lab of Department of Agricultural Entomology, University of Agriculture, Faisalabad, Pakistan during the year 2012-2013. To observe toxicity of insecticides against cotton jassid and its predator Chrysoperla carnea (Steph.) an experiment was laid out in CRD under laboratory conditions at 25±1°C temperature and 69±5% relative humidity. There were eight insecticide treatments viz., Talstar10EC (Bifenthrin), Endosulfan35EC (Thiodan), Trebon30EC (Etofenprox), Confidor200SL (Imidachloprid), Polo 500SC (Diafenthiuron), Monocrotophos 40 WSC (Monocrotophos) and two control treatments. Each pesticides was applied @ 1.4 ml with two concentrations (C1=0.025% and C2= 0.05% on third instar larvae of the predator and known number of jassids with Pottar Spray Tower in three different modes (A1- insecticides applied to the substratum, A2insecticides applied to the substratum+prey and A3- insecticides applied to the substratum+prey+predator). Observations were recorded after 24 hours of each application. It was found that Monocrotophos was most toxic giving (95.56%) mortality of C. carnea, after that Talstar (79.44%), Confidor (38.33%), Endosulfan (33.33%), Polo (30.00%) and Trebon caused (27.22%) mortality of predatory larvae. Monocrotophos and Talstar proved toxic while rest of insecticides were moderately toxic and selective in their use against the predator. All the test insecticides effectively controlled the cotton jassid. Talstar was highly toxic resulting 86.81 percent mortality followed by Monocrotophos (84.24%) , Confidor (82.67%), Trebon (79.83%), Endosulfan (78.51%) and Polo (77.18%). Results of the feeding response of third instear larvae of Chrysoperla carnea on cotton jassid revealed that minimum consumption (2.89 pests/ larva) was on Talstar treated jassids and maximum on Polo treated A. devastans (6.71 pests/ larva). Larval feeding on the treated cotton jassids was Talstar 2.89, Monocrotophos 3.96, Confidor 6.33, Trebon 4.55, Endosulfan 5.84 and Polo 6.71 jassids/larva.
Page(s):
311-321
DOI:
DOI not available
Published:
Journal: Journal of Agricultural Research, Volume: 55, Issue: 2, Year: 2017
Keywords:
Pakistan
,
Insecticides
,
Chrysoperla carnea
,
toxicity
,
predation
,
cotton jassid
,
Amrasca devastans