Choi, K.S., Lee, S.G., & Shin, S.C. 1997 [Selection of a low toxic insecticide for aerial control of the black pine bast scale, Matsucoccus thunbergianae.]. Journal of Forest Science (Seoul) 56: 82-86.
Notes: Stem injection of a systemic insecticide such as Phosphamidon 50% Lq and thinning are commonly applied to control the black pine (Pinus thunbergii) bast scale, Matsucoccus thunbergianae in the Korea Republic. However, both these methods have high labour costs, so aerial spraying with a low toxicity insecticide was tested as an alternative. Buprofezin 40% SC was selected as a low toxicity pesticide, and was applied as 100 litres/ha in 50-80x dilution. Both dilutions, used at different locations, gave about 80% mortality of the intermediate nymph stage under all conditions. The effective application period for this aerial control method was in early March.