An experiment was conducted at Malakandher Research Farm, NWFP Agriculture University Peshawar during the summer season of 1996. The experiment was laid out in split-plot arrangement in Randomized Complete Block (RCB) design in 3 x 3m2 sub-plot with four replications. The objective of this study was to evaluate the adverse losses often occurred by natural diseasers i.e. hails storms, wind storms & insect pest to sunflower, determined through the artificial induction of leaf incision at different growth stages for the plant height at maturity. No of leaves per plant, days to 50% flowering. Days to maturity, Disc diameter & number of grains per disc. On average of all treatments carried out, (l1), two holes per leaf at early four leaf stage (S1), resulted in significantly higher plant height and the No of grains per head significantly decreased to 1239 with (l1), two holes per leaf from that of (l2), control i.e. 1677 seeds per head.
Sharifullah Khan , Sherin Khan and Bakht Roidar Khan , 2000. Effect of extent of various leaf incisions treatments at different growth stages on the performance
of sunflower (Helianthus annuus). Pakistan Journal of Biological Sciences, 3: 2053-2054.