Mamta Purohit , D. K. Pandey , Jamaluddin

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K. C. Joshi , N. Roychoudhury , S. Sambath , S. Humane , D. K. Pandey

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Effectiveness of three varietal toxins of Bacillus thuringiensis viz. var. dendrolimus endotoxin, var. thuringiensis and its exotoxin and var .kurslaki endotoxin. Were evaluated in the laboratory against the last instar larvae of Atteua fabriciella Swed. By spraying on larvae and food plant, Alianthus excelsa Roxb. Results revealed that the spraying of B.t. on host plant was more effective in killing larvae than on the target pest, irrespective of toxines. Among the tested toxins, var. dendrolimus endotoxin proved to be highly effective and appeared to be best, both for larval and leaf treatment @ 2.0 and 1.5% respectively.

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N. C. Pant , D. K. Pandey , S. D. Sonkar , S. K. Banerjee

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The influence of different pit sizes with or without fertilizer application on survival and growth of thirty months' old Cassia siamea in degraded soil was studied. The survival and plant height significantly increased as tlie size of pit increased with or without fertilizer. Urea over 25 g pit^-1 applied in smaller pits < 30 cm³ ) adversely affected the survival of plants, where as, response of phosphorus as a whole was observed to be positive. Among forty possible treatment combinations (5 pit sizes and. 8 fertilizer levels) the best treatment combination was 45x45x60 em pit size with 75 g urea and 75 g single superphosphate per pit for better survival and higher growth of plants.

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