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Development of the Beet Armyworm and Its Parasite Chelonus texanus in Relation to Temperature

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Abstract:

Individual beet armyworms, Spodoptera exigua (Hubner), were reared on lima bean-agar medium in temperature cabinets. Regression equations are: for the number of days for the egg stage, ŷ = -0.3472 + 0.0083 X; from the first-instar larva to the prepupal stage, ŷ = -0.0921 + 0.00203 X; to the pupal stage,) ŷ = -0.1032 + 0.00214 X; and to the adult stage, ŷ = -0.0716 + 0.00147 X, where ŷ is the reciprocal of days and X is the temperature (°F). The rate of development was the same at constant as at fluctuating temperatures. Comparisons indicated a rate of development similar to published life-history records of beet armyworms in Florida asparagus ferneries during 1932-33. Chelonus texanus Cresson developed at a similar Tate to that of S. exigua. The regression equation for the number of days to the death cell from the hatching of the S. exiglla egg is ŷ= -0.1385 + 0.00283 X, and to the adult stage is ŷ = -0.0841 + 0.00164 X.

Document Type: Research Article

Publication date: December 1, 1966

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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.
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