Abstract
Within tolerable limits, the rate of embryonic development in insects is in direct proportion to incubation tem- perature, at given levels of relative humidity. There is a marked lack of quantitative data in the literature concerning the effects of suboptimal temperatures within these limits on the hatching of fertile eggs of the the southwestern corn borer, Zeadiatraea grandiosella (Dyar). Eggs of this species may be obtained from moths emerging from field-collected pupae or from those reared from immaculate or summer-form larvae. However, since moth emergence and subsequent egg production are spread over several days, it is difficult to obtain sufficient numbers of eggs or young larvae of the same age for use in studies requiring large-scale manual infestations during a short span of days.
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