Aphid Transmission of Maize Dwarf Mosaic Virus Strains

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Abstract
Rhopalosiphum maidis, R. padi and Myzus persicae acquired maize dwarf mosaic virus (MDMV)-A and MDMV-B after probes of less than 30, 10 and 30 s, respectively. R. maidis, R. padi and M. persicae retained MDMV-A at least 90, 120 and 240 min, respectively; and MDMV-B at least 30, 90 and 30 min, respectively. The rates of loss of ability of transmit MDMV-A and MDMV-B were the same for all aphid-virus combinations studied. The efficiency of MDMV-A transmission by aphids from corn to corn, corn to Johnsongrass and Johnsongrass to corn did not differ significantly, indicating that both plants were equally effective as virus sources. Strain MDMV-A was retained longer (at least 90, 120 and 240 min by R. maidis, R. padi and M. persicae, respectively) than was MDMV-B (at least 30, 90 and 30 min by R. maidis, R. padi and M. persicae, respectively), after a 10-min acquisition access on diseased corn leaves. Strain MDMV-B was not transmitted to Johnsongrass by the aphids tested.

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