R. S. Bhandari , M. E. Joshi , S. M. H. Zaidi , J. M. S. Rawat

Abstract

Chemical control of cone and seed insect of Himalayan Silver fir (Abies pindrow Royle) was conducted by using systemic insecticides. Two methods were followed for insecticide application: (i) Drip line application in soil, and (ii) tree injection. Performance ofmonocrotophos @ 100ml per 20 cm gbh of a tree was found best, protecting 82.44% cones of Silver fir used as tree injection followed by drip line application in soil by thimet @ 100 g per 20 cm gbh where 75.76% cones were protected from the attack of cone worm, Dioryctria abietella.

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R. S. Bhandari , J. M. S. Rawat , Vinod Kumar , S. M. H. Zaidi

Abstract

Chemical control experiments were conducted against the coneworm, Dioryctria abietella by following the soil application of thimet 109 and furadan 3g, and tree injections of phosphomidon 85 sl and monocrotophos 36 ec at different dosages of treatments including control in seed production area of Deodar in Kansar Range of Chakrata Forest Division, Uttaranchal. The post treatment observations revealed a significant decline in the incidence of infestation in the case of drip line application in soil of thimet 109 @ 100 grams per 20 cm girth and tree injection of monocrotophos 36 ec @ 100 ml per 20-cm girth.

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R. S. Bhandari , Swati Pande , M. C. Joshi , S. M. H. Zaidi , J. M. S. Rawat , Vinod Kumar

Abstract

Control of cone worm Dioryctria abietella Denis and Schiff. Infesting cone and seed of spruce (Picea smithiana) in seed production areas was attempted. The systemic insecticides viz thimet, carbofuran, dimethoate, monocrotophos were applied at the point of drip line application in soil and through tree injection at the base of the trees in Seed Production Area (SPA) at Deoban, Kanasar Range, Chakrata Forest Division (Uttaranchal). Tree injection with monocrotophos 36 EC 100 ml with 20 cm Girth of a tree at Breast Height was found superior than the application of granular pesticides in the soil at the drip line. Tree injection could protect 86.49 per cent, cones from the attack of cone worm.

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