Munir Al-Nabhan(1)*, Firas Asaad(1), Ahmed Fahd Al-Rai(1), and Ziad Al-Issa(2)
(1) General Commission for Scientific Agricultural Research, Hama Center, Hama.
(2) General Commission for Scientific Agricultural Research, Directorate of Cotton Researches, Aleppo, Syria.
(*Corresponding author: Munir Al-Nabhan,E-mail: mo.alnabhan@gmail.com(
Abstract
The whitefly Bemisia tabaci (Homoptera; Aleyrodidae) is an important pest on cotton in the world, and many technical reports have referred to the importance of agricultural methods for degreasing their damage. This research aimed to study the impact of the environmental and agricultural factors on B. tabaci on Syrian cotton varieties. This work was carried out in a cotton field at the hama research center in 2018 season. The treatments were applied in experimental plots 4×4m in three replications. Results of yellow traps and field observations showed that B. tabaci began to appear in early July at the flowering date, and increased gradually until the end of the season. The highest density of B. tabaci nymphs was on the lower leaves, then the middle and then the upper leaves with significantly differences in all tests. The infection rates on cotton varieties; Aleppo 124, Aleppo118, Niab, Raqqa5, Aleppo 90 and Aleppo 33/1 were decreased respectively, with significantly differences. Tests the impact of irrigation and plant density were carried out on two varieties Aleppo124 and Aleppo 33/1 .The influence of irrigation rate at 100% and 80% of field capacity caused 6.9 and 2.6 nymphs /leaves respectively with significantly differences, while there was no effect to the plant density on the whitefly density.
Keywords; cotton, Bemisia tabaci, varieties, irrigation, plant density, infection rates.
Full paper in Arabic: pdf