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Fall plant infestation counts have been made during five years in fields and plats of known dates of sowing. Actual safe sowing dates as they occurred for the same points in northern counties, varied widely during this time. This was apparently due to the difference in intensity of the brood and to meteorological influences. Permanent safe seeding dates are now established, but the entomologists, through surveys, locate the counties where the most intense fall emergence will occur. They, through the county extension service, devote their efforts toward guiding these counties past such an emergency. Parasitism has been high in all flaxseeds passing the summer months above ground. Submerged flaxseeds gave rise to the most of the fall emergence during these years. Parasitism of submerged flaxseeds is limited largely to Platygaster hiemalis Forbes, which deposits its eggs in the fall in the eggs of the host. This parasite has been efficient in killing a high percent of the host larvae developing from eggs deposited during the first wave of emergence of adults, but does not control the host. It is absent in the fields during the visitation of the stragglers of the brood which, in Ohio, is the portion that perpetuates the insect in fields sown near the proper seeding dates.
Document Type: Research Article
Publication date: June 1, 1923
More about this publication?
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.