PJB-2003-115
EFFECT OF SALICYLIC ACID, KH2PO4 and K2HPO4 ON THE EGG HATCHABILITY, ADULT EMERGENCE AND POPULATION OF BEMISIA TABACI AND COTTON LEAF CURL VIRUS SEVERITY
M. ASLAM KHAN, Q. NADEEM, S. M. KHAN AND M. A. NASIR
Abstract
Salicylic acid, potassium dihydrogen phosphate (KH2PO4) and dipotassium hydrogen phosphate (K2HPO4) at 2 and 3 % concentrations were drenched in pots in wooden cages covered with muslin cloth and as foliar sprays under field conditions on cotton cvs. S-14 and NIAB-Krishma. Bemisia tabaci collected from virus infected plants were released on these plants placed in wooden cages. Data recorded one day before spray and then 24, 48 and 72 hrs after spray on egg hatchability, adult emergence, adult whitefly population and CLCuV severity were recorded at the end of the experiment and statistically analysed. Seven samples from each of the treated and control plants of S-14 and NIAB-Krishma were collected and their protein contents were estimated by Kjeldahl method. Salicylic acid at 3 % concentration proved to be the best in reducing egg hatchability, adult emergence, adult whitefly population and severity of CLCuV and increasing different levels of proteins viz. thaumatin, ß 1, 4-gluconasis and chitinasis in S-14 and NIAB-Krishma. KH2PO4 and K2HPO4 applied at 3 % concentration also significantly reduced egg hatchability, adult emergence and whitefly population and CLCuV severity compared to control.
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