Abstract
Abstract Pinus sylvestris (2-2.5 m high) growing in a Christmas tree plantation were chosen for evaluating toxicity of candidate insecticides against crawlers. Infested trees were sprayed May 15, using a KWH mistblower operating at maximum rpm’s deliver ca 946 ml of finished spray to each of 4, single tree replicates per treatment. Ambient temperature was 15-16°C with overcast skies and moderate breeze (7-15 kph). Tagging and spraying trees required 5 man-hours. Treatment effectiveness was evaluated May 27-28 by collecting infested needle fascicles, placing them in coin envelopes, and transporting foliage in an airconditioned vehicle to the laboratory. A dissecting microscope was used to determine viability of the first 100 settled nymphs observed. Counts were always made from at least 3 fascicles.
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