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Krishnaswami, S.
- Growth Increment and Genetic Variability in Relation to Age in Saplings of Eucalyptus tereticornis Sm.
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Indian Forester, Vol 108, No 3 (1982), Pagination: 175-178Abstract
Studies were carried out at the Forestry Research Station. Mettupalayam to assess the variation in growth components at 6 and 12 months after planting and growth increment in progenies of eight plus trees of E. tereticornis of Arakku Valley, Andhra Pradesh. Saplings of hulked seed served as control. The genetic parameters of growth components in relation to age were also determinted. Though no progeny proved superior to the bulk population in respect of any of the growth attribute investigated, in terms of diameter increment, Those of T4 T6 and T7 scored over others. Heritability of plant height and base diameter did not vary with age. Base diameter was characterised by high heritabllity and low GA suggesting the high heritability to be due to non-additive genes.- Studies on the Effect of Caspsule Weight on Seedling Vigour in Eucalyptus tereticornis
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Indian Forester, Vol 108, No 10 (1982), Pagination: 673-675Abstract
The association, if any, of capsule weight on seedling vigour was studied in EucalyptuIs ereticornis. Capsules were graded on the basis of their 100 capsule fresh weight into five ategories viz. 10, 15, 20, 25 and 30 g and their seeds sown in a replicated randomised trial. Neither germination percentage nor seedling attributes like shoot length, ischolar_main length or eedling dry weight varied due to capsule weight.- Coptosoma ostensum Dist. - a Pentatomid Pest of Palas (Butea monosperma) with Notes on its Coccinellid Predator Synia melanaria Var. Rougeti Muls. And Egg Parasite Telenomus species
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Indian Forester, Vol 88, No 3 (1962), Pagination: 231-237Abstract
No abstract- Lac Cultivation Trials on Moghania macrophylla (willd.) O. Ktze (Syn. Flemingia congesta Roxb. Var. Semialata Bak.)
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Indian Forester, Vol 88, No 4 (1962), Pagination: 305-313Abstract
No abstract- Effect of Artificial Partial Defoliation of Palas (Butea monosperma) on Brood Lac Preservation in the Baisakhi Crop
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Indian Forester, Vol 88, No 11 (1962), Pagination: 866-872Abstract
No abstract- Lac Cultivation in Assam with Notes on the Use of Arhar (Cajanus cajan) and Other Species as Lac Hosts
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Indian Forester, Vol 85, No 5 (1959), Pagination: 294-300Abstract
Assam which has been known as a centre of lac production since very early days, differs from the rest of the country in many respects in regard to lac cultivation. High precipitation received in the region, distributed over 8 to 9 months in the year has made it possible to exploit crop and shrub type host plants such as arhar (Cajanus cajan) and Leea species for successful lac cultivation. Published information on the state of lac cultivation in Assam, the use of arhar, Grewia, Leea and other uncommon species of plants as lac hosts, and the various cultivation practices in vogue in the state is very meagre and in this article a detailed account on the above aspects has been given based on a recent study and enquiry made in the state.- Studies on the Determination of Optimum Amount of Broodlac Requirement for Crop Inoculations
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Indian Forester, Vol 89, No 8 (1963), Pagination: 540-554Abstract
Crop yields depend on the timely use of proper quantity of broodlac, and its proper distribution on the branches of the trees. Investigations were undertaken to determine the optimum requirement of broodlac for inoculations of kusum for both the Jethwi and Aghani crops and the present paper r~ports the results of investigations carried out for four years. Four brood rates, so as to give lat'val settlement on twigs over about 6-7, 12-13, 25 and SO times the length of brood sticks used for inoculation, were compared. The following observations could be made : (1) density of larval settlement increased with the brood rate used but not in direct proportion, (ii) the percentage of larval mortality was inversely proportional to the density of settlement indicating that certain minimum density is essential, (iii) there was a tendency towards higher percentage of males as the brood rates were increased, (iv) the yield per tree in both Jethwi and Aghani seasons increased with the increase in the quantity of brood used but not in same proportion as the brood rate. Yet it is more profitable to use more brood per tree on fewer trees than to use less brood per tree on a larger number of trees, because the slightly increased total yield obtained in the latter case will not adequately compensate for the much increased costs of operation with a larger number of trees. Further heavier brood rates within reasonable limits ensure better success of lac crops particularly in adverse seasons, (v) brood rate for crop inoculations should be such that it gives larval settlement on shoots nearly 10 times the length of broodlac sticks used for the Jethwi and 8 times the length of brood sticks used in the case of the Aghani crop.- Systematic Trials of Lac Cultivation on Chont (Zizyphus xylopyra Willd.) in Madhya Pradesh-pruning
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Indian Forester, Vol 91, No 6 (1965), Pagination: 406-417Abstract
Pruning aims at producing maximum number of suitable shoots and is one of the chief factors responsible for the survival of the lac insects and the ultimate crop yield. Systematic trials on lac cultivation on ghont in Madhya Pradesh were carried out for the first time. Results indicate that pruning for Baisakhi crop (October/November to June/July) should be carried out in April of the same year to allow six months' time and for Katki crop (June/July to October/November) in May of the previous year to allow thirteen months' time for the development of maximum number of suitable shoots after pruning.- Pruning and Lac Cultivation Studies on Ghont (Zizyphus xylopyra Willd.) (Rhamnaceae) at Namkum
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