Feeding behavior of potato aphid affected by glandular trichomes of wild tomato
1988
Goffreda, Joseph C. | Mutschler, Martha A. | Tingey, Ward M.
Mortality of the potato aphid, Macrosiphum euphorbiae (Thomas), on Lycopersicon pennellii (Corr.) D'Arcy and its F₁ hybrid with Lycopersicon esculentum Mill. was significantly greater than that on L. esculentum. Physical entrapment was not the sole mechanism of resistance in L. pennellii since few late instar aphids were found trapped in the sticky glandular exudate of the type IV trichomes; entrapment could, however, affect survival of early instars. Aphid settling on L. pennellii was dramatically less than that on L. esculentum, suggesting that starvation may have contributed to high mortality. Compared to L. esculentum, aphid feeding behavior on L. pennellii and the F₁ was characterized by a delay in the time to first probe, a reduction in the number of probes, and a decrease in the total proportion of time spent feeding. Removal of the glandular exudate of the type IV trichomes from L. pennellii resulted in a decrease in preprobe time and an increase in both the number of probes and the percent of time spent probing. Transfer of glandular trichome exudate of L. pennellii to leaflets of L. esculentum resulted in an increase in resistance as measured by these three parameters.
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