Abstract
SUMMARYFewer of the eriophyid mite Abacarus hystrix, vector of ryegrass mosaic virus (RMV), were found on RMV‐infected field plants of Italian ryegrass (Lolium multiflorum cv. S. 22) than on healthy plants. In glasshouse experiments, mites multiplied similarly on healthy and infected plants until disease symptoms developed; afterwards, they did not multiply as rapidly on infected plants and appeared to disperse from them more than from healthy ones, thus encouraging disease spread.
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