Population Dynamic of the Two-Spotted Spider Mite, Tetranychus urti-cae Koch and its Associated Insect Predators on some Okra Varieties | ||||
| Assiut Journal of Agricultural Sciences | ||||
| Article 5, Volume 45, Issue 1, March 2014, Page 83-99 PDF (355.58 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ajas.2014.595 | ||||
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| Abstract | ||||
| The current study focused on the two-spotted spider mite, T. urticae and its associated insect predators on some okra varieties, cultivated in the farm of the Faculty of Agriculture, Assiut University. In this study, the mite and three insect predators were surveyed on eight okra varieties. The simultaneous impact of certain environmental variable factors and other factors on the census of the mite pest and its predators revealed that, temperature, relative humidity and plant age were the most vital factors influenced the population densities of these species. On the other side, the sensitivity of okra varieties to the pest injury and the success of predation depend mainly on the intensity of the capillaries on the plant leaves. In the present study, it become clear that, the okra varieties with heavy capillaries leaves (such as: Lee and Askandrany) hinder predation of mite predators and at the same time is considered a refuge and protection of the mite pest. The census of the two-spotted spider mite eggs and motile stages on okra varieties revealed that, all the pest stages increased to enumerate through the summer season and the least number was recorded during winter one, while the rest two seasons were inbetween. | ||||
| Keywords | ||||
| The two-spotted spider mite; okra varieties; Population dynamics; Insect predators | ||||
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