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Pratap Singh , K. C. Joshi , D. Gurung

Abstract

In this paper larvae of Khasi pine shoot borer Dioryctria castanea Bradley (Lepidoptera: Pyralidae) has been described. The freshly hatched larva is cylindrical, ljght yellow in colour which changes to light brown and finally to dark brown in the fifth instar. The full grown larva is 17.42 × 2.0 mm. Head is brown, hypognathus with six pair of ocolli. Of the anterior setae A₁, A₂ and A₃, A₁ lies closer to the base of the antenna of the side whereas A₂ is posterior to it. Cervical shield and anal plate are brown. Arrangement of crochets of the legs is uniserial and biordinal. Chaetotaxy of the larva is described in detail.

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K. C. Joshi , D. Gurung , P. C. Sarma

Abstract

The poplars are defoliated by two species of poplar defoliators viz. Clostera fulgurita and C. restitura in N.E. region of India In the present article, the morphological characters and the chaetotaxy of their larvae have been described and compared. A key to identify both the species is also given.

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Pratap Singh , K. C. Joshi , D. Gurung

Abstract

There was an epidemic of Khasi pine shoot borer,Dioryctria castanea in 1982 in Yachuli Khasi pine plantations in Arunachal Pradesh. All age groups were attacked. Two field trials were conducted at Yachuli to find out the efficacy of phosphamidon, dimethoate,monocrotophos, methyl-demeton, formothion and thiometon against the shoot borer. Spraying of 0.03% phosphamidon/0.03% dimethoate/0.04% monocrotophos/0.03% formothion/O.03% thiometon in the last week of February was highly effective in reducing the incidence of the shoot borer.

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