Infestations of Diatraea saccharalis (F.) in corn caused significant yield losses chiefly associated with reduced primary ear weights due to tunnelling in lower internodes and ear feeding. Plant compensation, measured as increased secondary ear production, occurred in apparent response to artificial SCB infestations. Losses from lodging and stand reduction resulted only when infestations were initiated at the early-whorl stage of plant development. Percentage of loss per larva per plant was much higher (1.8–3.5-fold) from infestations begun at or before silking than from infestations begun at later growth stages. Ear quality was most severely affected by infestations initiated near the silking stage of development. Natural infestations beginning during or after kernel blister resulted in a significant decrease (ca. 40%) in secondary ear yields. Data on feeding site patterns relative to plant phenology indicated that the primary positions attacked changed from low portions of the stalk to ears as plant development progressed from whorl to silking. Also, natural infestations declined toward the late stages of kernel maturation.
Document Type: Research Article
Publication date: December 1, 1984
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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.