Höhn, H., Höpli, H.U., & Graf, B. 2003 Branch sampling investigations 2002/2003: a year with records.. Obst- und Weinbau 139(5): 6-10.

Notes: The results are presented of 341 samples of apple branches taken in 110 orchards in German-speaking Switzerland in 2002-2003. The occurrence of winter eggs of the red spider mite [Tetranychus urticae] was at its lowest since these samples were first taken, while infestation by scale insects (including the San José scale [Quadraspidiotus perniciosus]) was at its highest level. There was little change in the abundance of other pests from the previous year.