THE CHANGES IN THE POPULATION FLUCTUATIONS OF THE WHITEFLY, BEMISIA TABACI (GENNADIUS), HOMOPTERA: ALEYRODIDAE IN COTTON FIELDS.

Romeilah,, M. A.; Aly, M. M.M.

doi:10.21608/jppp.2000.258805

THE CHANGES IN THE POPULATION FLUCTUATIONS OF THE WHITEFLY, BEMISIA TABACI (GENNADIUS), HOMOPTERA: ALEYRODIDAE IN COTTON FIELDS.

Document Type : Original Article

Authors

Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt.

10.21608/jppp.2000.258805

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.