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Pakistan Journal of Biological Sciences
Year: 2000  |  Volume: 3  |  Issue: 3  |  Page No.: 459 - 462

Simulation of Leaf Damage by Artificial Defoliation and its Effect On Sunflower (Helianthus annuus L.) Performance

Shafiullah, M.A. Khan, M.A. Poswal, M.A. Rana and Baitullah    

Abstract: The removal of upper 2/3 and ½ leaves caused a yield reduction of 29 and 55.8 percent in 1992 and 37 and 44.8 percent in 1993, respectively. During 1992, about 1 percent yield decline was observed when the lower 1/3 leaves were removed and 6 percent yield declined with the removal of the lower ½ leaves, while in 1993, the yield reduction was 26.7 and 39.2 percent due to removal of lower 1/3 and ½ leaves, respectively. This indicated that upper leaves (source) contribute more towards sink (seed yield) as compared to the lower ones. Correspondingly, the results indicated that insects and pests feeding on the upper portion of the sunflower plant can cause more reduction in seed yield than the lower leaves.

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