G. C. Sharma , J. R. Thakur

Abstract

The alates of giant willow aphid Tuberolachnus salignus (Gmelin), a serious pest of willow (Salix spp) in the dry temperate zone of Himachal Pradesh first appeared on S. viminolis at Tabo (Lahaul and Spiti) in the first week of July. The progeny multiplied parthenogenetically throughout the period of infestation (July-December) by completing overlapping generations. The nymphal period and adult longevity varied from 12.4 to 27.4 and 20.6 to 42.4 days while fecundity was in the range of 15-50 nymphs per female depending on temperature which fluctuated between − 15 to 38 ° C. Alates appeared in the colonies from October to December but no sexuals were observed on Salix/I>.

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J. K. Dubey , Amith Nath , J. R. Thakur

Abstract

Pomegranate fruit borer(s) Virachola isocrates (Fabr.) and Deudorix epijarbas (Moore) are serious pests of wild pomegranate Punica granatum in Himachal Pradesh. In two years study, the conventiooal insecticide endosulfan 0.14% was found most effective when compared with quinalphas (0.10%), methyl parathion (0.05%) and a pyrethroid, cypermenthrin (0.01%). In the second year the two isomers of endosulfap, alpha and beta-endosulfan were isolated and tested separately. The efficacy of alpha isomer (0.07, 0.14%) was better than beta-endosulfan (0.07, 014%). Two sprays of endosulfan (0.14%) at one month interval are recommended for saving the fruits from borer attack.

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T. D. Verma , J. R. Thakur , G. S. Dogra

Abstract

Observations on the occurrence of Lymantria obfuscata Wlk, on oak in Haripurdhar Forest, Rajgarh Forest Division, Himachal Pradesh are reported. Some observation. On the bionomics of this species are also given. A tachinid parasite was found associated With this pest.

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