Definition of walnut moth
: any of several moths whose larvae eat the foliage of the walnut: such as a : regal moth b : imperial moth c : luna moth d : any of several red underwings of the genus Catocala e : a dagger moth (Acronicta americana) found also on the maple f : any of three arctiid moths of the genus Halisidota (H. caryae, H. tesselaris, H. maculata) g : a moth (Datana integerrima) whose larva feeds on and often defoliates walnut, hickory, birch, oak, chestnut, linden, and apple
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