Twospotted Spider Mite Resistance in Nicotiana Species12

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Abstract
Fifty-two species of Nicotiana and 17 tobacco cultivars were evaluated for resistance to Tetranychus urticae Koch. The plants were greenhouse grown, mass-infested with mites, and rated for injury. The Nicotiana spp. were tested further to characterize the nature of resistance by utilizing the technique that employs leaf disks with tanglefoot around the edge. Notably susceptible were N. glauca Graham, N. suaveolens Lehmann, N. debneyi Domin, and N. eastii Kostoff and the cultivar TI 1298. Resistance generally resulted from antibiosis and nonpreference. N. gossei Domin, N. noctiflora Hooker, N. Velutina Wheeler, and N. benthamiana Domin produced mite mortalities that ranged from 30–90% in 24 h. Nonpreference was manifested in many species, notably N. nesophila Johnst., N. stocktonii Brandeg., N. glutinosa L., and N. trigonophylla Dun. Resistance associated with a viscid secretion from trichomes took 2 forms: actual toxicity, and entrapment resulting in mite death by dehydration. Available evidence points to alkaloids as the chemicals responsible for antibiosis.

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