Insect pests of potato and their status in north-eastern India
1990
Lal, L. (Potato Research Station, Shillong (India))
In a survey, many insect pests causing severe damage to the potato crop and the tubers in north-eastern India were recorded for the first time. Insect pests were different in different stages of the region. However, cutworms [Agrotis ypsilon (Ratt)], white grubs (Lachnosterna coriacea Hope), leaf-eating caterpillars [Prodenia litura (Fab.), Heliothis armigera (Hubn.) and Plusia sp.] and aphids [Myzus persicae (Sulzer)] were some of the common pests observed throughout the region. Potato tuber moth [Phthorimaea opercullela (Zeller)] caused major damage only in Meghalaya, where it showed more than 50% plant infestations and 70% tuber damage under indigenous storage conditions, Epilachna beetle [Henosepilachna vigintioctopunctata (Fab)] caused major damage to potato foliage in Assam (10-55%) and in Arunachal Pradesh (30-70%). Red ants (Dorylus orientalis Westwood) was prevalent in Meghalaya and Arunachal Pradesh causing about 37% and 20% tuber infestation, respectively. Mole cricket (Gryllotalpa africana Palisot de Beauvois) was found damaging the young plants only in Tripura (10-30%).
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