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Diapause in twenty‐three populations of Plodia interpunctella (Hübner) (Lep., Pyralidae) from different parts of the world
Author(s) -
BELL C. H.,
BOWLEY C. R.,
COGAN P. M.,
SHARMA S.
Publication year - 1979
Publication title -
ecological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.865
H-Index - 81
eISSN - 1365-2311
pISSN - 0307-6946
DOI - 10.1111/j.1365-2311.1979.tb00575.x
Subject(s) - diapause , biology , photoperiodism , pyralidae , larva , population , zoology , plodia interpunctella , southern hemisphere , tropics , botany , ecology , demography , sociology
. 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.