Relationship between blue-stain of Pinus luchuensis and bark beetles living in the pine forest of the Amami Islands, Kagoshima pref., Japan
2008
Sumiyoshi, H.(Kagoshima-ken. Forestry Technology Center, Kamo (Japan)) | Usui, Y. | Sato, Y.
To identify bark beetles that transmit blue stain fungi to P. luchuensis and decide control timing of them in the Amami Islands, faunae of bark beetles in the forest of P. luchuensis and their seasonal variation were investigated. Further, attack pattern, rate of the beetles possessing blue stain fungi, and thermal character of blue stain fungi were investigated. Bark beetles bored the cut logs of P. luchuensis acted throughout the year. The major bark beetles were Cryphalus fulvus and Tomicus piniperda. Both of them carried blue stain fungi at high rate. Effects of incubation temperatures on mycelial growth of blue stain fungi showed that blue-stain can be growth all the year round in Amami Islands. The bark beetle bored logs of P. luchuensis within 7 days after cut down. Thus, to control blue stain, adequate insecticides must be applied on the logs of P. luchuensis immediately after cut down in spite of the season.
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