Betula platyphylla : 1 the Preferred Oviposition Host of Lymantria dispar japonica 2 in Hokkaido, Japans

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Abstract
Japanese gypsy moth, Lymantria dispar japonica Motschulsky, in low population densities in northern Japan's mixed species forests, oviposited almost exclusively on the white bark of Betula platyphylla Sukatschev: in plots totaling 3.3 ha, 88 of 90 egg masses were on white birches, which comprised < 30% of the stand composition. Likewise, high densities of the moth in a planting of Larix leptolepis (Sieb. and Zucc.) Gord. preferred to oviposit on B. platyphylla: 3 white birches among 154 trees (0.09 ha) held 84% of the egg masses, and one birch that had a DBH of 17 cm held 482 masses. These findings have practical application for field workers who wish to collect gypsy moth eggs in northern Japan where white birch is found.

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