| Authors(s) | Helsen, H.H.M., Blommers, L.H.M., Trapman, M.C., Polesny, F., Muller, W. and R.W. Olszak |
| Year | 1996 |
| Title | Timing observation and control of mussel scale Lepidosaphes ulmi. Bulletin OILB SROP 19: 145-149. |
| Authors(s) | Helsen, H.H.M., Blommers, L.H.M., Trapman, M.C., Polesny, F., Muller, W. and R.W. Olszak |
| Year | 1996 |
| Title | Timing observation and control of mussel scale Lepidosaphes ulmi. Bulletin OILB SROP 19: 145-149. |