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Neem as Soil Drench Systemic
On Sat, 21 Jun 2003 13:42:35 -0500, "John T. Jarrett"
wrote: Does anyone use Neem Oil as a soil drench for systemic effect? http://www.trifolio-m.de/pflanzensch...mic_effect.pdf ABSTRACT The systemic effects of neem on the western ßower thrips, Frankliniella occidentalis (Pergande), were investigated in laboratory trials using green bean, Phaseolus vulgaris L., in arena and microcosm experiments. In arena experiments, systemic effects of neem against western ßower thrips larvae on primary bean leaves were observed withmaximum corrected mortality of 50.6%. In microcosm experiments using bean seedlings, higher efÞcacy in the control of western ßower thrips were observed withsoil applications of neem on a substrate mixture (i.e., Fruhstorfer Erde, Type P, and sand) in a 1:1 ratio (93% corrected mortality) compared withapplication on the commercial substrate only (76% corrected mortality). However, longer persistence of neem was observed with soil application on the commercial substrate, which showed effects against thrips for up to 6 d after application. In addition to systemic effects observed on all foliage-feeding stages of western ßower thrips, mortality on contact and repellent effects were observed on soil-inhabiting stages after soil applications of neem. Finally, bean seedlings grown from seeds pregerminated for 3 d in neem emulsion were also toxic to western ßower thrips. "As crude a weapon as a cave man's club the chemical barrage has been hurled at the fabric of life." Rachel Carson tomj |
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