Field application of some plant extracts for controlling the pinks stem borer Sesamia cretica led.
2011
El-Hefny, A.s.
Plant extracts - derived from the leaves of two plants sweat marjoran and rosemary also two biopesticides; (dipel 2X) and (biofly) and their mixtures and diazinox - were applied in the maize field during the early summer plantation April 2010, for controlling the pink stem borer Sesamia cretica led. Data demonstrated that water, acetone extracts of sweat marjoran and water extract of rosemary achieved the highest reductions (95.2 - 98.8%) in egg-masses and (89.5 - 98 %) in number of larvae. For the two symptoms of infestation; the perforated leaves and the dead hearts; mixture of rosemarry with biofly caused the highest reduction for S. cretica infestation symptoms (96.3 - 94.7%, respectively). Data obtained from the laboratory tests were harmony with those obtained from field application which the LT50 values at 0.05% confidence limits were determined. From these data the importance of using plant extracts could be illustrated which definitely are promising agents which could be a good alternative tool for chemical pesticide trying to reduce its harmful effects not just on human but also on the environment as all.
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