%A Claudia Daniel %A Eric Wyss %T Efficacy of Surround? WP against the European pear psyllid (Cacosylla pyri) in large-scale field trials %X Are pre-flowering applications of Surround? WP sufficient to keep the European pear psyllid (Cacopsylla pyri) below the economic threshold for the whole season? %D 2003 %K Entomologie Obstbau, Birenblattsauger %I Research Institute of Organic Agriculture (FIBL), CH-Frick %L orgprints4866