Abstract
Abstract Efficacy of insecticides against spring generation crawlers of a pine needle scale was evaluated on heavily infested 2-m Scots pine growing in a Christmans tree plantation. Foliar sprays were applied with a KWH backpack mistblower operating at high rpm and delivering 900 ml of finished spray per minute. Each treatment was applied to four, single-tree replicates that received 900 ml each on 14 May under sunny skies at 26°C with a breeze of 6 to 10 kph. One week posttreatment, five infested needle fascicles were removed from each tree, and percent mortality was assessed with the aid of a binocular dissecting scope. Viability of the first 100 settled nymphs observed on at least three fascicles was recorded.
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