MANAGEMENT OF THE ELM BARK BEETLE, SCOLYTUS KASHMIRENSIS SCHEDL INFESTING ELM TREES (ULMUS SPP.) IN KASHMIR

Abdul A Buhroo

Abstract


Experiments were conducted to determine the influence of cultural and chemical control measures of elm bark beetle, Scolytus kashmirensis Schedl on elm trees (Ulmus spp.) in Kashmir. Seasonal pruning reduced infestation of the pest significantly; spring and autumn pruning reduced it by 1.17% and 65.77% respectively. However, sanitation reduced the infestation rate only by 15.91% and 27.61% in two treated elm plots. The efficacy of the screened chemicals at different concentrations against the pest varied significantly among each other. 1.0% concentrates of all the screened chemicals were effective with Dichlorvos ranking first in efficacy against the pest. Dichlorvos was efficient followed by a mixture of Monocrotophos and Carbendazim. However, Imidacloprid was least effective followed by Endosulfan. Technically 0.05% concentrate of these chemicals was ineffective whereas 0.1% solution controlled the pest population considerably. The results showed that 1.0% solution of Dichlorvos (causing a mortality of 92.70%) or a mixture of Monocrotophos and Carbendazim (mortality 86.33%) could be used to control the infestation rate of S. kashmirensis effectively.


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