The effect of direct release (inside bags) of faba bean seeds or wheat grains with the release of Anisopteromalus calandrae was studied on insects populations, percentage damage seeds and percentage weight loss of stored seeds or grains due to infestation with Callosobruchus maculates (F.), Callosobruchus chinensis (L.) on faba bean seeds, Rhyzopertha dominica (F.) and Sitophilus oryzae (L.) on wheat grains at Ismalia and Sharkia governorates locations. Results showed release of A. calandrae reduced the monthly rate of increase of tested beetles on faba bean at rates between 35.20 and 42.14%. These rates resulted in populations reduction at the end of 6 month storage period at rates between 31.24 and 36.71%. In case of wheat grains the monthly rate of increase was reduced at rates between 29.05 and 46.80%. These rates resulted in populations reduction at the end of storage period at rates between 31.51 and 47.98%. The relative faba bean damage after the storage period was reduced in the range of 32.71 to 40.99% as a result of the parasitoid release. In case of wheat grains the obtained reduction in grain weight ranged between 72.67 and 81.66.
This work aims at evaluation the efficiency of the acetone and petroleum ether extracts of Cubeb fruits Piper cubeba (L.) and Thyme flowering buds Thymus vulgaris (L.) against the adults of Sitophilus oryzae (L.), Rhizopertha dominica (F.) and Tribolium castaneum (Herbst). Also, persistence of the two plant extracts compared to malathion and pirimiphos-methyl (actellic) using the most sensitive insect species (S. oryzae), was investigated .Results showed that , the efficiency of the two plant extracts was concentration and exposure period -dependent. At the highest tested concentrations (2&1%w/w), the acetone extract of P. cubeba and petroleum ether extract of T. vulgaris were highly effective against S. oryzae and R.dominica adults, while, T. castaneum adults were the least sensitive . On the other hand, the petroleum ether extract of P.cubeba and the acetone extract of T.vulgaris indicated lower effectiveness against the three tested insects even after two weeks from treatment. The results also showed that, malathion and pirimihos methyl indicated clearly longer residual toxicity than the two plant extracts.
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