Using coconut potassium soap 'Cocana' in woolly apple aphid control

摘要

Woolly apple aphid (lErisoma lanigerumj belongs to serious pest in IPM and organic apples. The pest is spreading in orchards where the abundance of natural enemies is decreased after applications of not selective insecticides (organophoshates, neonicotinoids). The aphid also appears in dense orchards with unbalanced pruning and fertilization. Although aphid itself is sensitive to the most of registered aphicides the waxy covering produced by the aphids often causes a failure of a common spray programme. As a very effective way how to overcome this barrier is the application of coconut soap (Cocana) close before insecticide treatment. In our trials the efficacy of applied Cocana (2%) in high volume spray followed by combination of orange oil (Prev B-2) with insecticide Mospilan 20 SP and Pirimior 50 WG on aphid colonies was 97.7 % and 98 %, respectively. The efficacy of Prev B-2 without insecticides was not satisfactory and other preparations must be tested for organic systems.