Aerial Application of Bacillus Thuringiensis

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"Mixtures of commercial formulations of Bacillus thuringiensis Berliner + a low dosage of fenitrothion and an operational dosage of fenitrothion were applied to white spruce and balsam fir against the spruce budworm (Choristoneura fumiferana Clem.). The effects of the treatments were assessed 8, 17 and 30 days after treatment. Dipel + the low dosage fenitrothion was effective in reducing the budworm population on balsam fir only; Thuricide + the low dosage fenitrothion and the operational dosage of fenitrothion gave good foliage protection to balsam fir. None of the treatments resulted in a population reduction or foliage protection to white spruce. The egg mass survey at the end of the field season forecast a reducted budworm population on the Thuricide + low dosage fenitrothion plot only. The overall results indiqated that Thuricide + low dosage fenitrothion was effective in protecting the forest trees from excessive defoliation in the year of application and probably in the succeeding year as well"--Abstract.

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