Applications each year over a S-year period of four bi-weekly sprays, containing insecticides fungicides, to apple nursery trees increased tree vigor and tree grade considerably. Sulfur was the most effective fungicide, while demeton-DDT or lindane-DDT provided excellent control. The effects of adequate insect and disease control appeared to be cumulative over the 3- year period. Considerable differences were evident in trees of different apple varieties in response to adequate insect and disease control as indicated in tree growth. Less vigorous apple varieties showed a greater benefit from spraying than the more vigorous varieties, but significant gains from spraying were obtained with all varieties.
Document Type: Research Article
Publication date: October 1, 1960
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.