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Resistance to the carmine spider mite, Tetranychus cinnabarinus (Boisduval), and to the two-spotted spider mite. T. urlicae Koch, was observed in the greenhouse in accessions of Solanum penncllii Carrel, Lycopcrsicon hirsulum Humb & Bonpl. and L. hirsutum f. glabratum C. H. Mull. but not in L. peruvianum var. dentatumDun. or L. glandulosum C. H. Mull. The mites became entangled in the sticky exudates of the glandular hairs of these species. The density of the glandular hairs, though stable in S. pennellii, varied in L. hirsutum. Selection and selling of plants of L. hirsutum f. glabratum that had high pubescence and were thus resistant to mites indicated that these characters are inherited by the progeny.
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Gentile et al. (1969) studied this question.
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