Effect of certain insecticides on phytophagous, predacious mites and yield of three cotton cultivars | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 6, Issue 2, December 1998, Pages 1-12 PDF (739.58 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.1998.461511 | ||
| Authors | ||
| A. EL-Saedy1; S. Abdel Rahman2; M. Shawir* 3; M. Abo- EL-Saad3 | ||
| 1Plant Protection Research Institute, A.R.C., Giza. | ||
| 2Center Laboratory of Pesticides, Sabahia. | ||
| 3Pesticide Chemistry Department, Fac. Agric., El Shatby, Alex. Univ. | ||
| Abstract | ||
| The effect of certain insecticide treatments either alone or in sequence on the spider mite Tetranychus spp and its associated predatory mites were studied Three cotton cultivars, Mc Nair 220 (Upland), Alexandria 4 (free gossypol barbadense) aid Giza 70 (glanded barbadense) and their yield were also evaluated. Results showed that Mc Nair 220 was the mos susceptible variety to the spider mite Tetranychus spp. compared with Alex 4 and Giza 70, Tetranychus spp. has two peaks of infestation on cotton, the lowest one appeared on the seeding stage and the highest one on the vegetative and flowering stages. Profenophos gave the highest percent reduction of Tetranychus spp infestation, while Methomyl showed the lowest reduction Sequential insecticide treatments showed moderate reduction throughout fifteen days of infestation. Moreover, there was no significant difference between the treatments on the cotton yield. However a significant difference was observed between Mc Nair 220 and Giza 70 or Alex in their yields. | ||
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