| Author(s) | Abdullah N. M. M.* and Joginder Singh** |
| Affiliation | * Department of Plant Protection, College of Agriculture, Sana’a University, (Maen Post Office), P.O. Box 13609, Sana’a, Yemen E-mail: abd-nasher@yahoo.co.in (Corresponding author) ** Department of Entomology, Punjab Agricultural University (PAU), Ludhiana, India |
| Title | Bio-residual Effect of Some Insecticides on Development of Whitefly, Bemisia tabaci (Gennadius) on Cotton |
| Source | Journal of King Saud University. Agricultural Sciences. Volume 18, No 2. (2006/1426) |
| Abstract | This study was conducted during 2002 cotton crop season at the Entomological Research Farm, Punjab Agricultural University, Ludhiana (Punjab, India). Quinalphos (250, 375 and 500 g), carbaryl (625, 938 and 1250 g), acephate (750, 1125 and 1500 g), endosulfan (438, 656 and 875 g) and fenvalerate (25, 38 and 50 g ai/ ha) were repeatedly sprayed for 5 times at 7-day interval on potted plants of American cotton (var. LH 1556). Five pairs’ whitefly adults were confined in micro leaf cages on treated plants after 3 days from the spray. Adults were removed along with leaf cage after 24 hours. The leaf portion under each leaf cage was marked and observed under stereomicroscope binocular using 25X for the number of eggs laid. Only 20 eggs were kept and the remaining was removed. The leaf cage was attached again to the leaves on the marked area, which was observed daily under stereomicroscope binocular (25X) for recording different biological parameters. The obtained results reveal that the incubation period ranged between 5.5 to 8.8 days with non-significant differences between different treatments. Similarly, none of the insecticidal treatment has shown adverse effect on egg survival. All insecticides except the tested doses of fenvalerate resulted in significant prolongation of nymphal duration and caused adverse effect on nymphal survival as will as growth index. None of the treatments showed any significant effect on pupal duration and survival. Total developmental period and total survival on treated plants with all doses of fenvalerate and low doses of acephate were completed as normal as untreated control, whereas other treatments resulted in prolongation of developmental period and significant reduction in total survival. Keywords: Bemisia tabaci, Insecticides, Development, Cotton. |
