Population fluctuation of Tetranychus urticae koch and its predacious thrips, Scolothrips longicornis priesner on cucumber and bean varieties, under green-house conditions
2009
Abou El-Saad, A.K. | Embarak, M.Z.
The population fluctuation of the two spotted-spider mite, Tetranychus urticae Koch and the predaceous thrips, Scolothrips longicornis Priesner on cucumber and bean varieties were studied under green-house conditions, at the Experimental Research Center of El-Mina University, Shosha region, for the two consecutive seasons 2007 and 2008. The obtained data showed that both of T. urticae and S. longicornis exhibited one peak on cucumber and bean plants. Peaks of T. urticae and S. longicornis occurred on the 2. d and 3. d weeks of April for bean and cucumber in both seasons. The cucumber varieties differed in their infestation by .T umcrre. Nile and Katia varieties harbored greater numbers of eggs and moving stages of T. urticae followed by Passandra and Asna varieties. Bean showed significant differences among Novax, Kentucky wonder and A Slin wonder varieties in their mite infestation. Generally, cucumber varieties mounted lower numbers of T. urticae than bean varieties. On the other hand, correlation between numbers of S. longicornis and the population density of eggs and moving stages of T. urticae on all cucumber and bean varieties in the two growing seasons was positively. Only cucumber varieties affected fertility of T. urticae.
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