By C.R.A. Godfrey
Bargains an intensive evaluate of the real agricultural purposes of either typical items and artificial compounds derived from usual items, providing particular details at the isolation, structural experiences, organic job and toxicology of those compounds. The increasing sector of insecticidal typical items is highlighted.
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Extra resources for Agrochemicals from Natural Products (Books in Soils, Plants, and the Environment)
1 ppm [203, 2041. Assimisin proved effective as an antifeedant against the striped cucumber beetle (Aculymma vittatum) on melon leaves at 5000 ppm . Recognizing the complexity of the structure of asimisin and the improbability of an economical synthesis, the use of an extract of the bark of Annonaceous trees as an insecticide has been suggested . In one test, such a concentrated extract richin asimisin but containing at least five other acetogenins was sprayed on rowsof bush beans with a natural infestation of bean leaf beetles (Cerotoma trifurcatu).
INSECTICIDES 43 there was no visible damage and growth was superior to the untreated row 12031. , annonin I, annonin W , asimisin, and several other acetogenins were isolated 12051. From this study, annonin I proved tobe identical to squamocin, which had been reported earlier from A. squamosa 12061. In a feeding test against the fruit fly (Drosophila melanogaster), annonin I showedgood ovicidal and larvacidal activity at a rate of 125 pg/2g of diet . Annonin I also gave complete control of mustard beetle (Phaedon cochleariae) larvae on cabbage plants, cabbage moth (Plutellu mculipennis) larvae on cabbage, and aphids ( M y u s persicae) on beans at 40 ppm .
An LDN of19 and 28 ppb, respectively . An improved synthesis of a-T based on a nickel-catalyzed reaction of 2,5dibromomothiophene with 2-bromothienylmagnesium bromide madeaT available forfieldscalework [173, 1741. Dependingon the formulation, trials in eastern Canada at both boreal and deciduous forest sites resulted in reliable control of Aedes spp. larvae at an application rate of 50 or 100 g of a-T per hectare . Good results were also achieved in Tanzania against the malaria mosquito Anopheles gumbiue [1711.
Agrochemicals from Natural Products (Books in Soils, Plants, and the Environment) by C.R.A. Godfrey