Hi, This disscussion list was make last week. It want to be windthrow forum. If you know other people working in this problems, please send them the address to subscribe. Ionel Popa Dr.eng. Ionel Popa Research Station for Norway Spruce Silviculture Calea Bucovinei 73 bis Campulung Moldovenesc RO5950 ROMANIA www.icassv.ro