Effect of Rearing Temperature on Mortality, Second-generation Emergence, and Size of Adult in Megachile rotundata (Hymenoptera: Megachilidae)

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Immature alfalfa leaf cutting bees, Megachile rotundata (F.), were reared from the egg or early larval stage to the adult stage at one of four temperature regimes (16, 24, 29, 29/16°C [12 h:12 h]) to assess influence of temperature on 1) pre- and post overwintering mortality 2) incidence of diapause, and 3) size of adult. Preoverwintering mortality was significantly greater at 16°C than at all other treatments, and more males than females died under lower rearing temperatures. Rearing temperature had no effect on incidence of diapausing bees for the first 2 weeks of the study. During week 3, the 29°C treatment significantly decreased the number of diapausing bees compared with other treatments. Rearing temperatures affected size of emergent adults: adults of both sexes were significantly smaller when reared at 16°C than at other temperatures; females were also smaller when reared at 24 than at 29°C or 29/16°C. Rearing M. rotundata immatures at temperatures of ≤24°C is ineffective in increasing the number of diapausing bees and has the additional detrimental effects of increasing preoverwintering mortality (particularly of females) and of reducing size of adults.

Document Type: Research Article

Publication date: August 1, 1986

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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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