Eggs (18-24 hours old) of the tobacco budworm. Heliothis virescens (F.), and the bollworm, H. zea (Boddie), were exposed to ultraviolet irradiation of a short (2537 A) or a long (3600 A) wavelength to determine the effect of these rays on egg hatch, subsequent development, and adult longevity. A gradual increase in time of exposure to the short-wave rays caused a gradual decrease in the percentage egg hatch, and no hatch occurred after an exposure of 20 minutes. However, the hatch was not greatly affected until exposures were longer than 1 minute. Eggs exposed to the long-wave rays had a comparable percentage hatch in all treatments. The treatments had no influence on time for larval and pupal development or on the longevity of adults emerging from embryos that survived the treatment.
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Guerra et al. (1968) studied this question.
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