Insecticidal effect of plant extracts from tropical and subtropical species. Traditional methods are good as long as they are effective
1990
Stein, U. (Federal Biological Research Centre for Agriculture and Forestry, Darmstadt (Germany, F.R.). Inst. for Biological Pest Control) | Klingauf, F.
Nowadays botanicals are being frequently recommended for plant protection particularly in subsistence crops in Third-World countries. However, the effect of these preparations is often not fully known. A selection of plant extracts prepared from 13 different plant species of the tropics and subtropics were tested upon their insecticidal properties towards Myzus persicae (Hom., Aphididae) and Plutella xylostella (Lep., Plutellidae). Besides the value of those recommendations it was the purpose to exhibit exemplary the possible research and developmental requirements. Whereas all of the extracts prepared with ethanol had an efficacy between 60 and 100 per cent towards M. persicae, only two of them were effective towards P. xylostella: pyrethrum flowers (Chrysanthemum cinerariaefolium and related species) and an extract prepared from avocado leaves (Persea americana) with 100 per cent and 74.8(plus-minus 13.7) per cent, respectively. Cold water extracts from the same plant species turned out to be ineffective with the exception of pyrethrum flowers when prepared with a 0.5 per cent soft soap solution
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