Pesticidal Activities of Some Cyclic Phosphorus Esters

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Preliminary tests for pesticidal activities of some cyclic phosphorus esters derived from o-hydroxybenzyl alcohol or its analogues were undertaken. 2-Ethoxy-4H-1, 3, 2-benzodioxaphosphoran-2-one has strong insecticidal activity. Some other esters have weak or no insecticidal activity by themselves but strong synergistic action with malathion to houseflies and silkworms. Some cyclic esters show nematocidal activity and phytotoxicity.

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