alfalfa webworm

noun

Definition of alfalfa webworm 

: the small greenish or blackish larva of a pyralid moth (Loxostege commixtalis) that feeds on and webs together the leaves of various succulent plants and is especially destructive on sugar beet and alfalfa

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First Known Use of alfalfa webworm

1905, in the meaning defined above

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The first known use of alfalfa webworm was in 1905

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