Plant bugs, Lyaus lineolarius (Palisot de Beauvois) and Neurocolpus nubilius (Say), can delay early fruiting of cotton (Gossypium hirsutum L.) and thus increase risks associated with other cotton insect posts. As has been found for fleahoppers, Psoudstomoscelis seriatus (Reuter), injury from plant bugs might be lessened in mixed plantings of cotton genotypes compared to uniform plantings. Our objectives were to evaluate plant bug injury in uniform and mixed plantings of rive cotton genotypes and to determine if mixed plantings provided any advantage over the uniform plantings. Five cotton genotypes, which have distinguishing morphological traits, and 10 mixes (all possible two-part combinations of the five genotypes) were evaluated in tests at Marianna, AR, in 1991 and at Clarkedale, AR, in 1991 and 1992. During late flowering, squares were randomly collected from each plot and evaluated for plant bug injury using the anther damage technique. Combining ability for plant bug injury was evaluated using diallel analysis with the uniform planting considered as parents and the mixes considered as F₁ combinations. Plant bug injury to the genotypes was similar to previous reports of relative sensitivity of the related morphological traits. The diallel analysis indicated significant general combining ability and non-significant specific combining ability for plant bug injury in each test. Therefore, plant bug injury to mixed plantings was intermediate to injury to their respective component lines. Mixed plantings had no advantage over uniform plantings of the genotypes with respect to plant bug injury.