Agrochemicals from Natural Products (Books in Soils, Plants, by C.R.A. Godfrey

By C.R.A. Godfrey

Bargains a radical evaluate of the $64000 agricultural functions of either ordinary items and artificial compounds derived from average items, featuring particular info at the isolation, structural experiences, organic job and toxicology of those compounds. The increasing zone of insecticidal usual items is highlighted.

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Against milkweed bugs, encecalin caused 50% mortality applied topically at 10 and 11 pg to second and third instar nymphs, respectively. Compound 93 was about half as active; 91 showed no effect at 100 pg. Again, no unexpected developmental effects were observedon survivors. INSECTICIDES 41 In two articles [184,1891, the authors conclude with thoughts on the suitability of these chromenes as models for future work. IX. MAMMEINS The extensive work done on extracts of seeds of the evergreen tree Murnrneu arnericuna, long known to be insecticidal, was recently reviewed by Crombie [190].

5%' all larvae eventually died and it was estimated that tomato leaves containing an amount of cocaine equivalent to that found in fresh coca leaves would result in 68438% inhibition of feeding of Manduca. Pesticidal activity is attributed to cocaine's ability to block the reuptake of the neurotransmitter octopamine 12451.

Changes in the position of the carbonyl group on the carbon chain did not affect toxicity [215]. 2Tridecanone in wild tomato plants was the major component imparting resistance to the tobacco hornworm and the Colorado potato beetle (@tinotam decemlineata) and less so to H. zea 12161. Parasitoids and predators of H. zeu were also adversely affected by the presence of 2tidecanone and 2-undecanone [216]. 17mg after 24 hr in a 400-cm3 jar [217]. Crude extracts from the South African plant Aloe pluridens (Liliacae) exhibited insecticidal activity against a variety of mosquito species and the southern armyworm (Spodoptera eridania) [2181.

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