Suppression of Heliothis spp. with Cottons Containing Combinations of Resistant Characters123

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Abstract
The use of nectariless, glabrous, and high-gossypol cottons and cottons with combinations of the 3 characters were evaluated against Heliothis species in replicated large field cages and in field plots. In cage tests, insect populations increased only 1.1 times (a maintenance population) between the 1st and 2nd generations on a cotton combining all 3 characters. Populations on glabrous plus high-gossypol cottons or on glabrous plus nectariless cottons increased 2-fold between the 1st and generations. Normal commercial types of cotton with none of the 3 characters had a 10–12-fold increase between generations. In the 1974 field tests, the glabrous plus high gossypol line yielded 700 lb/acre more seed cotton than the commercial check; and a high gossypol cotton (not glabrous) yielded 950 lb/acre more seed cotton. In field tests, glabrous plus high-gossypol cottons reduced populations of the bollworm, Heliothis zea (Boddie), and tobacco budworm, H. virescens (F.). A glabrous line suppressed larval populations by 68%, and 4 lines with a combination of both characters suppressed populations 60–88%. The nectariless character did not reduce insect populations because of the small size of the plots.

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