Effects of Organometallic Compounds on Lepidoptera1,2

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Lethal effects of some organometallic compounds on larvae of the bollworm, Heliothis zea (Boddie); tobacco budworm, H. virescens (F.); and the cabbage looper, Trichoplusia ni (Hübner), were evaluated. Also, the effect of these compounds on larval weight and hatch of eggs from moths that developed from treated larvae was determined. Acetoxytrimethyltin, hydroxytrimethyltin, and acetoxytriethyllead, caused 92% or more kill of bollworm and tobacco budworm larvae when they were applied topically and 52% or more when they were applied as foliar sprays. Hydroxytrimethyltin, acetoxytriphenyllead, acetoxytrihexyltin, acetoxytributyllead, oxybis[tributyltin], and hydroxytriphenyltin caused the greatest reduction in larval weights of both Heliothis species when they fed on plants treated with the compounds. Less than 2% of the eggs laid by moths emerging from tobacco budworm larvae treated with acetoxytrimethyltin, hydroxytriphenyltin, and oxybis[triphenylgermane] hatched, and hatch was 0.3% or less from moths emerging from bollworm larvae that had been treated with hydroxytriphenyltin and chlorotrioctyltin. It appeared that tobacco budworm moths produced fewer eggs than bollworm moths emerging from reared larvae. Hydroxytriphenyltin reduced the percentage of fruiting forms damaged by Heliothis species by 60% in a field cage and 10% in a field trial. A dosage of 3.36 kg per hectare reduced the larval weight of cabbage looper larvae 75%.

Document Type: Research Article

Publication date: February 1, 1968

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