A rapid method is described for spraying eggs of pink boll worm (PBW), Pectinophora gossypiella (Saunders),on plants of cotton, Gassypium hirsutum L., to evaluate the plants for resistance to the insect. Pink boll worm eggs were collected from the USDARS rearing facility at Phoenix, Ariz., and suspended in a 0.05% solution of gum xanthan in distilled water. After preliminary experimentation, we used a ratio of 1 egg to 1,250 parts solution (14.4 eggs per ml of solution). The solution was poured into a polypropylene bottle and sprayed on cotton plants in the field with the use of a spray wand (an estimated 630 eggs in 44 ml solution per meter of row). A constant air pressure was maintained with the use of an oxygen tank fitted with a compressed air regulator and a line pressure gauge. This method required 2.5 s per boll per person compared with 21.3 s per boll per person for boll infestation by the use of an automatic repeating pipette. Using the new method, we evaluated 99 cotton germ plasm lines and found 19 that sustained significantly less seed damage caused by PBW than the resistant control line, AET-5.
Document Type: Research Article
Publication date: June 1, 1988
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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.