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The biology of the two-spotted spider mite Tetranychus urticae as affected by resistant solanaceous plants

1985; Elsevier BV; Volume: 13; Issue: 3-4 Linguagem: Inglês

10.1016/0167-8809(85)90020-9

1873-2305

Aly H. Rasmy,

Agricultural pest management studies

Two species of solanaceous plants, Lycopersicon hirsutum f. Glabratum Humb & Bonpl. and Solanum sarachoides Sendter, were found to be resistant to the two-spotted spider mite Tetranychus urticae Koch. Leaves of both species have a dense covering of glandular hairs and mites were quickly entrapped in their exudate. Even when stripped of glandular hair exudate, the leaves of these plant species were still found to be unsuitable for mite development. On L. hirsutum leaves stripped of exudate, 40% of the T. urticae larvae developed to the deutonymphal stage, but none survived to the adult stage. On similar leaves of S. sarachoides, all mites died before reaching the deutonymphal stage. For comparative purposes, the experimental work also included leaves of L. esculentum, cultivar ‘Stakeless’, upon which 40% of the larvae reached the adult stage. An extract from the leaves of L. hirsutum f. glabratum proved to have an acaricidal effect when mite females were confined for 3 h on filter paper discs treated with the extract. The exudate from S. sarachoides leaves showed no acaricidal properties.