Vol. 11, Special Issue 8 (2022)

Author(s):
Krishna Gupta, Gajendra Chandrakar Ashithosh Mohanan, Rajkumari and Gulab Singh Rajput

Abstract:
The acute toxicity of spinetoram against the 3^rd instar larvae of diamondback moth (DBM) Plutella xylostella on cauliflower were initiated in the laboratory, Department of Entomology, College of Agriculture, IGKV, Raipur in 2020-21. Using six different doses of spinetoram: 0.2, 0.4, 0.6, 0.8, 1.0 and 1.2 ml/L, experiment were conducted against DBM 3^rd instar larvae. Each treatment was replicated three times; probit analysis was used to determine LC₅₀ values for the treatments against 3^rd instar larvae. When the treatments were assessed at 24, 48 and 72 hours, LC₅₀ values against larvae were 0.788%, .0478% and 0.331%. The slopes of the probit lines for larvae assessed at 24, 48 and 72 hours after application of spinetoram were 2.09, 2.32 and 2.95.This indicates that there was a more rapid changes in larval mortality with increase in pesticide dosage. The study shows that spinetoram can achieve effective control of DBM 3^rd instar larvae under laboratory conditions.