Abstract
ABSTRACT The swallow-wort biological control agent, Hypena opulenta, undergoes facultative diapause mediated by photoperiod. However, some individuals enter diapause even at long daylengths, resulting in univoltine populations in the field and reducing the efficiency of rearing programmes. Through laboratory experiments, we identified a strong positive correlation between pupal weight and early diapause. Additionally, we compared two metrics of reproductive preparedness (female egg-load and male lipid stores) between first (diapausing) and second (continuously developing) summer generations. Females had higher egg-loads in the second generation than the first. Generational polyphenisms, combined with early diapause, may exacerbate slow population growth by Hypena opulenta.
Published Version
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