Toxicological evaluation and biological potency of petroleum ether extract of two plants and their isolates towards the two spotted spider mite Tetranychus urticae Koch
2003 - Volume: 43 Issue: 1-2 pages: 67-73
Keywordstoxicological biological activity botanical extracts two-spotted spider mite Tetranychus urticae
Six compounds isolated from unsaponified fraction of crude petroleum ether extracts of Curcuma longa L. rhizomes and Nicandra physalodes L. herb were tested for their acaricidal activity against Tetranychus urticae Koch females. The biological potency of the crude petroleum ether extract of both plants as well as the isolated compounds were assayed against the adult females. Petroleum ether extract of C. longa and the different compounds isolated from the unsaponifiable fractions were more toxic to the adult females than N. physalodes extract or its isolates. At LC50 level, Cu I isolated from C. longa ranked the first among the different compounds isolated, whereas the triterpenoids isolated from N. physalodes were the least effective. Newly emerged adult mite females offered discs treated with median concentration (0.153%) of crude petroleum ether extract of C. longa or its isolates and the median concentration (0.5%) for N. physalodes crude extract and their isolates induced serious effect on the biotic potential of female adults. A high significant reductions in egg production and percentage mortality together with a significant increase in percent sterility were recorded. However, no significant effect was recorded on egg hatchability. In studying the bioresidual effect of the crude extract of both plants under semi-field conditions, both extracts proved to have a lasting effect of 7 days against the adult females.
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