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Abstract

EFFECT OF NEEM DERIVATIVES ON ADULT EMERGENCE OF DYSDERCUS CINGULATUS (HETEROPTERA: PYRRHOCORIDAE)

S. Umamaheswari* and A. Rajarajeswari**

ABSTRACT

Neem oil and neem cake extract were evaluated for their adult emergence effect on the nymphs and adults of Dysdercus cingulatus. The data indicated that total inhibition by neem oil varied from 46.66%, 60.00% and 66.66% and in Neem cake extract from 20.00%, 33.33% and 40.00% at a concentration range of 2.0%, 3.5% and 5.0%. At a similar concentration range, the nymphal mortality by neem oil and neem cake extract ranged from 13.33% to 53.33% and 6.66% to 13.33% in the fifth instars. Azadirachta indica A.Juss was used for controlling the insects which gave a significant mortality and suppressed the adult emergency effect of Dysdercus cingulatus. An increase in the concentration of test solutions resulted in an increase in the inhibition rate.

Keywords: Dysdercus cingulatus, Azadirachta indica, adult emergence, mortality and inhibition.


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