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Arya, S. R.
- Biology and Life History of Poplar Shoot Borer, Eucosma glaciata Meyrick (Lepidoptera: Eucosmidae) in Himachal Pradesh
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Indian Forester, Vol 121, No 1 (1995), Pagination: 39-43Abstract
The Poplar shoot Borer E. glaciata is one of the most destructive lepidopterous pest of P. ciliata in nurseries. The biology and habits of this insect have been discussed with special reference to its life history and nature of damage. Adult of E. glaciata has a longevity of 5.60 ± 0.516 days. The females lays an average of 75 to 100 eggs. The incubation period average 5.56 ± 0.527 days. The total life cycle in laboratory reared specimen varies from 35 to 40 days. The larvae damage the apical tIPS, resulting in die-back and forking.
- Seed Fertility in Relation to Tree Size of Abies pindrow and Picea smitriana
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Indian Forester, Vol 120, No 8 (1994), Pagination: 677-681Abstract
The effect of size of tree on the fertility of Silver fir and Spruce seed was studied. Although the cone diameters in different diameter breast height class of Silver fir differed significantly at 5% level yet cone lengths did not differ. The seed weights in different diameter breast height classes also differed significantly. However, cone diameters and cone lengths of Spruce did not differ significantly but the seed weights differed significantly. Germination percentages and germination values of seeds from different diameter breast height class trees of Silver fir differed significantly and the same values were, however, non-significant in case of Spruce.- Time of Transplanting Silver Fir Seedlings
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Indian Forester, Vol 117, No 1 (1991), Pagination: 13-17Abstract
To findoutmost suitable time of transplanting sliver fir seedlings, a study was undertaken. The results indicate that fir seedlings transplanted during August give higher survival and growth of seedlings. Transplanting of silver fir seedlings therefore, should not be delayed beyond August.- Conifers Research Centre's Contribution to Western Himalayan Forestry Research
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Indian Forester, Vol 117, No 11 (1991), Pagination: 999-1008Abstract
This paper lists the forestry, environment and ecological studies carried out at Conifers Research Centre and those which need attention now.- Optimum Sowing Time of Spruce (Picea smithiana Wall Ex. Boiss) in Western Himalayas
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Indian Forester, Vol 116, No 4 (1990), Pagination: 329-330Abstract
No abstract- Effect of Gamma Rays on the Growth of Poplar
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Indian Forester, Vol 116, No 7 (1990), Pagination: 572-576Abstract
The study was conducted to observe the effect of gamma rays on P.ciliata and P. deltoides growth. The preliminary observations have indicated induction of variability in height and collar diameter and possibilities of selecting mutants resistant to rust and leaf spot diseases of poplars.- Spade Planting-an Economical and Faster Planting Technique of Silver Fir and Spruce in Western Himalayas
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Indian Forester, Vol 116, No 8 (1990), Pagination: 618-621Abstract
In North-Western Himalayas spruce and silver fir are normally planted in pits of 30 cm3 size. This method of planting is both expensive and time consuming. Spade planting of spruce and silver fir was tried, which was assessed six times faster and also five times cheaper than pit planting. It also gave better survival than pit planting, therefore, spade planting of spruce and silver fir is recommended.- A Note on Optimum Time of Insertion of Populus ciliata Cuttings in the Nursery
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Indian Forester, Vol 116, No 10 (1990), Pagination: 839-840Abstract
No abstract- Litter Fall and Natural Regeneration of Spruce and Silver Fir
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Indian Forester, Vol 113, No 9 (1987), Pagination: 616-621Abstract
The litler fall in the mixed forest of si1ver fir and spruce waS studied for a period of three years. The maximum annual litter fall varied from 5260.6 to 5173.0 kg/ha/yr in different experimental plots. The litter accummulation has adverse effect on natural regeneration of silver fir and spruce.- Clonal Reproduction of Populus ciliata - Use of most Suitable Parts
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