By C.R.A. Godfrey
Bargains an intensive evaluate of the $64000 agricultural purposes of either common items and artificial compounds derived from usual items, offering designated details at the isolation, structural experiences, organic job and toxicology of those compounds. The increasing region of insecticidal usual items is highlighted.
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Pyrroles The compound dioxapyrrolomycin (36, Figure 9) was isolated and identified from fermentation broths of Streptomyces strains in quick succession by three different groups. In the case of Meiji Seika Kaisha  and SS Pharmaceutical scientists , the isolation was directed using antibiotic screens. Dioxapyrrolomycin representsone of a series ofantiCl Figure 9 Dioxapyrrolomycin (36): Pesticidalactivity:(Reprintedwith mission from Ref. 91. ) Species Southern armyworm (Spodopfera eridania) Tobacco budworm (Heliothis virescens) Two-spotted mite (Tefranychus urficae) Western potato leafhopper (Ernpoascu abrupfa) *Leaf-dip assay.
The ethyl esters were as effective as the methyl esters. The isomers of108, in which the methoxy group was moved to the ortho or meta positions, were much less active. Methyl esters of 2-( pmethoxyphenoxy)propionic acid and of pmethoxyphenoxyacetic acid were also weaker in activity 12201. ), which showed some topical activity to houseflies . 5% against Mexican bean beetle (Epilachna vurivestis) and mosquito (Aedes aegypti) larvae . Epoxides 113 and 214, isolated from aspecies of the genus Pimpinella, showed some activity by contactwith houseflies and mites INSECTICIDES 47 (Tetrunychus felurius) but were ineffective against several other insects 12231.
In another study, basedon the observation that the tanveed Hemizoniu fitchii A. Gray (Asteraceae) reduces mosquito populations, the volatile oil from this plant was fractionated to give, among other products, chromenes 90 and 91, previously known from this plant , and 6-vinyl-7-methoxy-2,2-dimethylchromene (93) [1891. 6 ppm for compounds 93, 90, and 91, respectively. There was no effect on development noted for survivors through subsequent larval, pupal, and adult stages. Against milkweed bugs, encecalin caused 50% mortality applied topically at 10 and 11 pg to second and third instar nymphs, respectively.