Developmental times of Heliothis virescens1 and H. subflexa1 in Relation to Constant Temperature2,3

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Abstract
The development of the different stages of 2 field strains and a laboratory strain of the tobacco budworm, Heliothis virescens (F.), was determined at different temperatures. Results were compared with those from previous studies of a laboratory strain. The rate of development of the larval and pupal stages of males and females was similar for the 2 field strains and 2 laboratory strains. All 4 strains had similar larval and pupal developmental rates. Adult longevity of the 2 laboratory strains was similar. The duration of the developmental stages of H. subflexa (Guenée) was also determined at different constant temperatures. The egg stage ranged in length from 10.6 to 3.1 days at 16.7° and 30.3°C, respectively. Larval development ranged from 58.61 to 12.82 days at 15°—3O.3°C. Pupal development ranged from 24.16 to 9.36 days at 20.6°-32.2°C. Adults lived 42.33 days at 16.7°, and 6.72 days at 35°C. Development of the combined egg and larval stage of H. subflexa was ca. 4.4 days longer than that for H. virescens at 20° and 2.3 days longer at 30°C, or 14 and 6% longer, respectively. Pupal development and adult longevity were similar. H. virescens mated more often than H. subflexa at the slower temperatures.

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