Rates of growth and increase ofMyzus persicae on virus-infected potatoes according to type of virus-vector relationship |
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| Authors: | S J Castle and P H Berger |
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| Institution: | (1) Parma Research & Extension Center, University of Idaho, 29603 U of I Ln, 83660 Parma, ID, USA;(2) Department PSES, Division of Plant Pathology, University of Idaho, 83843 Moscow, ID, USA;(3) Present address: Irrigated Desert Research Station, USDA/ARS, 4151 Highway 86, 92227 Brawley, CA, USA |
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| Abstract: | Growth, reproduction and survival (=performance) of the aphidMyzus persicae Sulzer was measured on virus-free and virus-infected potato plants The principle objective was to evaluate if various viral
infections affected aphid performance differently, and if so, whether any order in the performance response of the aphid was
discernible according to the type of virus-vector relationship. Three viruses varying in their dependency onM. persicae as a vector were used. Plants infected with potato leafroll virus (PLRV), a circulative virus highly dependent uponM. persicae for dispersal and transmission, were superior hosts as determined by the significantly greater mean relative growth rate
(MRGR) and intrinsic rate of increase (rm) ofM. persicae compared with those of aphids reared on other plants. Plants infected with potato virus Y, a noncirculative virus less dependent
uponM. persicae for dispersal than PLRV, were intermediate in their quality based upon intermediate MRGR and rm values. Plants infected with potato virus X, a nonvectored virus independent ofM. persicae, were least suitable hosts along with the group of virus-free plants according to the lower MRGR and rm values. |
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| Keywords: | vector fecundity survivorship circulative and noncirculative viruses host plant quality |
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