Abstract
Mechanisms of resistance to the yellow sugarcane aphid, Stpha flava (Forbes), were studied in six Louisiana sugarcane cultivars. The cultivar CP 72-356 was one of the most preferred by yellow sugarcane aphid. This cultivar expressed low levels of antibiosis but may exhibit a degree of physiological tolerance to yellow sugarcane aphid feeding based on chlorophyll fluorescence. Yellow sugarcane aphid also showed a preference for CP 72-370, but this cultivar had high levels of antibiosis and a physiological tolerance to feeding. The least preferred cultivar was CP 70-321; however, it had poor antibiosis and may suffer inhibition of photosynthesis. CP 65-357 showed moderate levels of antixenosis, antibiosis, and tolerance to yellow sugarcane aphid feeding. CP 74-383 and CP 76-331 were considered the most susceptible because they expressed low levels of antixenosis, antibiosis, and tolerance to yellow sugarcane aphid feeding. Leaf discoloration ratings were negatively correlated with chlorophyll fluorescence (r = -0.27, df = 59, P = 0.04), suggesting that discoloration induced by aphids is not a good indicator of reduced photosynthesis.
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