THE CHANGES IN THE POPULATION FLUCTUATIONS OF THE WHITEFLY, BEMISIA TABACI (GENNADIUS), HOMOPTERA: ALEYRODIDAE IN COTTON FIELDS. | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 1, Volume 25, Issue 3, March 2000, Page 1815-1824 PDF (903.64 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2000.258805 | ||||
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| Authors | ||||
| M. A. Romeilah,; M. M.M. Aly | ||||
| Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt. | ||||
| Abstract | ||||
| Seasonal population activity of the whitefly, Bemisia tabaci (Genn.) in cotton Giza 86 was studied during 1999 cotton season. The experiment was carried out at Sakha district, Kafr El-Sheikh Governorate, from January to early of November. The occurrence of B.tabaci lasted about 15-17 weeks from the beginnning of Sowing. This pest had different numbers of population peaks, showing 5 peaks during the season of activity. Immature stages of B.tabaci occurred in high numbers on cotton leaves during the growing period and 3-4 peaks of population were noticed. An assessment of occurrence and abundance of annual broods was approximated. Concerning mid to late season; the population of whitefly adults showed a fluctuation of four peaks on July, August, September and October representing by 320, 850, 760 and 1850 individuals /100 leaves, respectively. For nymphs, four peaks were also observed on July, September and October representing by 300, 56, 42 and 16 individuals /100 leaves, respectively. | ||||
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