yellowtop
nounDefinition of yellowtop
1a
: any of several goldenrods
especially
: early goldenrod
—sometimes plural but singular in construction
b
: bitter clover
2
: any of several plant diseases characterized by yellowing of the upper foliage: such as
a
: a disease of alfalfa of undetermined cause characterized by a pronounced yellowing of the upper portions of affected plants
b
: a yellowing of alfalfa tops caused by the punctures of the potato leafhopper
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