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Swati Pande , R. S. Bhandari

Abstract

Chir pine cones collected from different localities of Uttaranchal and Himachal Pradesh exhibit great variation in morphology (cone weight , length , width and number of scales). Light weight cones of lesser length , width and number of scales were less preferred by beetles as compared to heavy weight cones with bigger size and more number of scales.

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Swati Pande , R. S. Bhandari

Abstract

Chlorophorus strobilicola causes seed loss in Pinus roxburghii. Seed loss is directly related to seed efficiency (S.E). There is negative correlation between seed efficiency and degree of infestation. As the attack of C. strobilicola increases from light to severe the seed efficiency decreases.

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R. S. Bhandari , Babita Dobhal , Swati Pande

Abstract

Cone and seed worm, Dioryctria abietella damages cones of Himalayan conifers. Infested cones were categorized on the basis of emergence holes into light, moderate, heavy, very heavy and severe intensities. Seed efficiency (S.E.) was found negatively correlated with the degree of attack as the degree of attack increased from light category to severe. The attack of D. abietella also hampered the development of cone, caused direct damage to seed and reduced the germeability of seed. Germination percentage decreased with increased degree of attack. Present studies help in estimating the production of seeds in the SPAs, seed orchards and seed stands of Blue pine.

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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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