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Potato Leafhopper Resistance in Glandular-Haired Alfalfa Species¹

Five glandular-haired alfalfa (Medicago) species were evaluated for resistance to the potato leafhopper (Empoasca fabae (Harris) in cages under greenhouse conditions. Preference was based on the percentage of time adults were observed on the plant rather than on the cage surface. Data showed that adults spent significantly less time on M. blancheana Boiss. and M. disciformis DC. than the adults did on the glabrous control (M. sativa L. ‘Vernal’). Adult mortality occurred at a higher rate on all five glandular-haired species than on the control. Highest rate of mortality (100%) occurred on M. noeana Boiss. within 3 days, compared with 53% mortality on the control after 9 days.

Total nymphal production, which reflects the over-all influence of the plant on the potato leafhopper, was significantly less on all five glandular-haired species than on the control. Glandular-haired species were nearly immune to the first instars, as all nymphs produced were found dead in the first stadium and trapped in glandular hair exudate.

Key Words: Insect resistance • Trichome • Empoasca fabae (Harris) • Alfalfa

² Assistant professor, Dep. of Entomology; research assistant, Dep. of Entomology; research associate, Dep. of Agronomy.

Received for publication October 5, 1978.

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