Evaluation of Chrysoperla Carnea for Population Management of Jassid Amrasca Devastans in B.t. Cotton Crop

Abstract

Evaluation of Chrysoperla carnea [Steph.], for the management of jassid in B.T. Cotton crop was carried out in Randomized Complete Block Design (RCBD) with 4 replications. There were four treatments: T1= Chrysoperla carnea (natural enemy), T2= Confidor (insecticide), T3= B.T. control and T4= NIAB-78(non Bt.) control plot. The treatments were applied at fortnightly intervals stating from 2^nd week of June. The jassid population was found infesting cotton crop. The data showed that the maximum population (2.38jassid/leaf) was recorded in T4, whereas minimum jassid population (1.76jassid/leaf) was recorded in T2. Over all maximum mean population of C. carnea (0.39/plant) was recorded in T1 and the minimum population was recorded (0.06/plant) in T2. The maximum seasonal mean of bolls (20.84bolls/plant) was recorded in T4 followed by T2 (20.13bolls/plant).

DOI: 10.7176/ALST/77-03

Publication date: January 31^st 2020