The Differences of Infection by Japanese Pine Bast Scale between Thin- and Thick-Bark Masson Pine

This paper reports the marked differences of infection by Japanese pine bast scale on Masson Pines of thin and thick bark types in Fuyang County, Zhejiang Province. The results showed that the number of both egg sac and nymph were significantly more on thin-bark trees than on thick-bark trees for different provenances of Masson Pine, thus indicating that Masson Pine of thick bark type is, to certain extent, resistant to Japanese pine bast scale.