The fauna of lepidopterous insect pests of the deciduous oaks, Quercus (Lepidobalanus) spp. (Fagaceae), which are food plants of the larva of the Japanese wild silk moth, Antheraea yamamai yamamai (GufiRiN-MENEViLLE), were investigated in Shiga Prefecture. The lepidopterous pests assosiated with the deciduous species of Quercus consisted of 164 species, representing 24 families. Associates of Q. acutissima were 104 species, those of Q. variabilis 132 species, and those of Q. serrata 49 species; of those species 38 on acutissima, 124 on variabilis and 23 on serrata are recorded as feeders of them for the first time. Eight species were recognized as the serious pests, 8 species being recognized as the second serious pests.
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