Abstract
Preliminary tests for pesticidal activities of some cyclic phosphorus esters derived from o-hydroxybenzyl alcohol or its analogues were undertaken. 2-Ethoxy-4H-l,3,2-benzodioxa-phosphoran-2-one has strong insecticidal activity. Some other esters have weak or no insecti-cidal 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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