A PRELIMINARY STUDY OF BALLIA OBSCUROSIGNATA LIU——AN IMPORTANT NATURAL ENEMY OF THE JAPANESE PINE BAST SCALE

Hu HE-LIN CHANG SHI-MIN YOUNG JING-KTIAN(Chekiang Institute of Forestry) (Liaoning Institute of Forestry and Pedology)CHENG YU-PO SHAO GUI-YING WANG FENG-YAO (Hangchow Botanical Garden)  

The lady bird beetle Ballia obscurosignata Liu is an important natural enemy of the Japanese pine bast scale Matsucoccus matsumurae Kuw., and its capacity in suppressing the scale was recently demonstrated in Hangchow district of Chekiang Province. In Hangchow it has four generations each year and the time of its occurrence is well synchronized with that of the scale. It can build up stable populations in pine forests. The voracities of the adults and larvae were tested with the scales in different stages. They can multiply normally and have three generations in Liaoning Province where the winter may be safely passed over above 0癈 and with syrup as food. Therefore this insect can be used for controlling the pine scales in Chekiang and Liaoning Provinces.

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【DOI】： CNKI:SUN:KCXB.0.1978-03-004

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