Diapause in twenty‐three populations of Plodia interpunctella (Hübner) (Lep., Pyralidae) from different parts of the world
CH Bell, CR Bowley, PM Cogan… - Ecological …, 1979 - Wiley Online Library
CH Bell, CR Bowley, PM Cogan, S Sharma
Ecological Entomology, 1979•Wiley Online Library1. The incidence of diapause in twenty‐three populations of Plodia interpunctella from fifteen
countries representing all continents of the world was examined. The origins of populations
varied from 52° N to 35° S and included two from equatorial regions. 2. Diapause occurred
in all population samples at 20° C in short photoperiods (LD 11: 13) and in continuous light,
although the proportion of larvae doing so was less than 25% in samples from the equatorial
belt. 3. The critical photoperiod was less than 13 h in five samples, all from the tropics, or …
countries representing all continents of the world was examined. The origins of populations
varied from 52° N to 35° S and included two from equatorial regions. 2. Diapause occurred
in all population samples at 20° C in short photoperiods (LD 11: 13) and in continuous light,
although the proportion of larvae doing so was less than 25% in samples from the equatorial
belt. 3. The critical photoperiod was less than 13 h in five samples, all from the tropics, or …
Abstract
1. The incidence of diapause in twenty‐three populations of Plodia interpunctella from fifteen countries representing all continents of the world was examined. The origins of populations varied from 52°N to 35°S and included two from equatorial regions.
2. Diapause occurred in all population samples at 20°C in short photoperiods (LD 11:13) and in continuous light, although the proportion of larvae doing so was less than 25% in samples from the equatorial belt.
3. The critical photoperiod was less than 13 h in five samples, all from the tropics, or southern hemisphere. The remaining samples, including three from the southern hemisphere, had critical photoperiods of 13 h or more.
4. Diapause was completely avoided by a 15 h photoperiod at 20°C in thirteen of the twenty‐three samples, including all but one of those from the southern hemisphere.
5. At 25°C larvae entered diapause in short photoperiods (LD 9:15) in about half of the samples tested in both hemispheres, but the proportion per sample was always less than a third.
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