Abstract
Microscopic features of small cotton floral buds abscised due to Lygus lineolaris (Palisot de Beauvois) feeding and non-insect factors were identified and contrasted with healthy buds. Feeding damage appeared to be most common on staminal columns, developing anthers, and corollas. These tissues exhibited gross enlargement and varying degrees of cellular degradation. Fragmented cell walls were thinner and stained lighter than those that were intact. Desiccation of buds abscised due to Lygus feeding was irregular. Tissues of buds abscised due to non-insect factors stained uniformly and all cells were intact. Uniform basipetal desiccation throughout the bud occurred in non-insect damaged buds, especially in anthers, staminal columns, and carpels. Tissues and cells of healthy buds stained uniformly and consistently and were without structural abnormalities. The biochemical composition of male reproductive tissue of cotton floral buds appears to play an important role in the nutritional physiology of L. lineolaris.
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