No harmful effects on aquatic insects were detected in two New Brunswick streams after forest spraying with phosphamidon [Formula: see text] in 1962 and 1963. Comparison of one pre-spray and two post-spray series of bottom samples showed no reduction in number of orders (and families in the case of Diptera) and no abnormal decline in the number of individuals. In numbers and variety of insects emerging daily into stream cages and of insects drifting onto vertical screens in the streams, no changes were attributable to phosphamidon.
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C. D. Grant (1967) studied this question.
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