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Bionomics, host range analysis of damage aspects on the black pine bast scale Matsucoccus thunbergianae Homoptera Coccoidea, in the coastal area of southwest Korea


Bionomics, host range analysis of damage aspects on the black pine bast scale Matsucoccus thunbergianae Homoptera Coccoidea, in the coastal area of southwest Korea



Korean Journal of Applied Entomology 31(4): 386-395



The black pine bast scale, Matsucoccus thunbergianae, causes severe damage to the black pines of southern coastal areas. It has one generation a year, coming out of the pine bark to mate and lays eggs from early March to early May. Especially, its peak time is from late March to mid-April. The host plants were found to be 7 species, Pinus thunbergii, P. strobus, P. taeda, P. banksiana, P. massoniana, P. taiwannesis, and P. densiflora. The percentage of damage black pine by the age were 0.8% for 1-year old ones, 3.7% for 4-6 years, 5.2% for 7-9 years, 9.3% for 10-12 years, 8.1% for 13-15 years, 7.8% for 16-18 years, 6.7% for 19-21 years, 3.3% for 22-24 years, 1.9% for 25-27 years, and 1.1% for 28 years. The highest rate of damage happened to 7-20 years old trees, whereas the highest rate of damage upon branches happened to 6-7 years old ones. Finally, as far as the trunk is concerned, the damages proceeded from the middle parts of the trunk, whose branches were alive up to the top. The rates of damage spread in pure forest/mixed forest area were turned out to be 81.3/52.5% in Koheung, 80.3/58.1% in Haenam, and 76.3/48.5% in Muan. That is, the damage rate was higher in the pure forest areas than the mixed forest ones. The higher the density of trees beyond 20 trees per 100m-2, the higher the damage rate was.

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