Relation of Insects to the Initiation and Development of Boll Rot of Cotton1

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Abstract
Of the insects causing direct injury to the cotton boll, boll weevils. Anthonotmus grandis Boheman; bollworms. Heliothis zea (Boddie); and tarnished plant bugs. Lygus lineolaris (Palisot de Beauvois), initiated boll rot infection. Initiation of boll infection by boll weevils ranged from 95 to 100%, by bollworms 55 to 80%, and by tarnished plant bugs 40 to 70%. Cotton bolls subjected to vinegar flies, Drosophila melanogaster Meigen, and cabbage looper moths, Trichoplusia ni (Hübner), developed nectary infections which in turn resulted in boll infection. Initiation of boll infection by vinegar flies ranged from 50 to 60%, and by cabbage looper moths 45 to 70%. Field-collected insects produced nearly as much infection as those held on the cultnres of Alternaria tenuis Auct, and Fusarium moniliforme Sheldon. No infection or rotting of the bolls was caused by either organism from contact inoculation.

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