Submitted to: Journal of Economic Entomology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: February 21, 2006
Publication Date: June 20, 2006
Citation: Liu, Y., Mccreight, J.D. 2006. Responses of nasonovia ribisnigri (homoptera: aphididae) to susceptible and resistant lettuce. Journal of Economic Entomology. 99:972-978. Interpretive Summary: Lettuce aphid, Nasonovia ribisnigri, was tested on susceptible lettuce and resistant lettuce that contained resistance gene Nr in various bioassays. The objectives were to determine effective bioassay methods to screen for resistance to lettuce aphid in lettuce breeding and determine susceptibility of commercial lettuce cultivars to lettuce aphid infestation. Whole plant bioassays of 3 to 5 days were adequate to separate resistant and susceptible plants. Both nymphs and alates were suitable. Both choice and no-choice bioassays using alates can be used to separate resistant and susceptible lettuce plants because alates tended to leave resistant plants. Longer term bioassays reveal complete control of lettuce aphid on resistant plants. Leaf disc bioassays were not suitable. All commercial cultivars were susceptible to lettuce aphid infestation, indicating the importance of lettuce aphid to lettuce production and breeding for lettuce aphid resistance.