Division of Entomology, Indian Agricultural Research Institute, New Delhi-110 012, India.
1Present address: Rice Research Station, Kaul (Kaithal Dist.) Haryana.
Online published on 31 October, 2011.
In laboratory, nimbecidine (neem oil 90.5%, azadirachtin 300 ppm) with five concentrations (0.25, 0.5, 1.0, 2.0 and 3.0%) was tried against first and second instar(s) of red cotton bug, Dysdercus koenigii Fab. by two different methods viz., spray (under Potter's tower) and seed treatment (dip). Higher doses of nimbecidine adversely affected the nymphal survival, female fecundity and adult emergence. However, egg hatchability remained unaffected. Dip method was found more effective against first instar, while spray method was effective against second instar, due to the hardening of exoskeleton.
Azadirachtin, neem oil, red cotton bug, spray, seed treatment
