Screening of Okra Cultivars for Resistance against Helicoverpa armigera
Screening of Okra Cultivars for Resistance against Helicoverpa armigera
Ajmal Khan Kassi1,*, Humayun Javed1 and Tariq Mukhtar2
ABSTRACT
Fruit borer, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae), is one of the most economically important and widespread pests of okra and causes worldwide yield losses. The pest is mainly controlled by chemicals which cause deleterious effects to human, livestock and environment. To dispense with the detrimental consequences of chemicals, use of resistant cultivars can prove one of the effective and reliable alternative approaches for the management of this pest. As the information regarding resistant cultivars is lacking, therefore, the objective of the present study was to identify resistant sources from among the available commercial okra cultivars. Okra cultivars showed significant variations from comparative susceptibility to comparative resistance. On the basis of fruit and shoot infestation caused by H. armigera,Manchali, RK-516, OH-152 and Tarnab Nargis were found comparatively susceptible, Rama Krishna, NS-810, Baharti Kaspori, Lady Finger-1 and Lady Finger-2 showed intermediate resistant reaction while KT-458, Bhindi Punjab Selection, Arka Anamika and Bhindi Sabazpari proved to be comparatively resistant. Maximum fruit and shoot infestations were recorded on comparatively susceptible cultivars while the infestations were the minimum on comparatively resistant cultivars. As comparatively resistant cultivars viz. KT-458, Bhindi Punjab Selection, Arka Anamika and Bhindi Sabazpari suffered less damage and therefore, are recommended for cultivation to avoid damage by Helicoverpa armigera.
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February 2018
Vol. 50, Iss. 1, Pages 1-400
