Abstract
Based on the frequency of honeydew droplet excretion, the feeding rate of green peach aphids,Myzus persicae (Sulz.), on the swollen leaf veins of beet curly top virus-infectedAmsinckia douglasiana DC. plants was found to be almost twice as high as on the veins of uninfectedAmsinckia plants. Radiochemical analysis of the honeydew indicated that the phloem sap in the swollen veins has a higher sucrose concentration than that in uninfected plants. Although disease-associated changes in the anatomy and in the level of gustatory nutrients in the phloem sap may contribute to the enhanced feeding rate, a higher turgor pressure of the phloem sap in the swollen veins may be responsible for the higher feeding rate as well as for the occasional exudation of sap from such veins.
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Magyarosy, A.C., Mittler, T.E. Aphid feeding rates on healthy and beet curly top virus-infected plants. Phytoparasitica 15, 335–338 (1987). https://doi.org/10.1007/BF02979549
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DOI: https://doi.org/10.1007/BF02979549