purple-top

purple-top

[′pər·pəl‚täp]
(plant pathology)
A virus disease of potato plants characterized by purplish or chlorotic discoloration of the top shoots, swelling of axillary branches, and severe wilting.
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References in periodicals archive ?
purple-top or Tokyo turnips (see page 86), peeled and trimmed 6 green onions, divided 1 tsp.
The tubes included a red-top tube with no anticoagulant, a purple-top tube with 150 g/L EDTA, a green-top tube with 72 USP units of heparin, and a blue-top tube with 32 g/L sodium citrate.
Whether you use peppery purple-top turnips or the sweeter Tokyo variety, this salad is excellent with a bowl of rice, braised short ribs (page 84), or even a burger.