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Diapause and cold tolerance of larvae of Ephestia elutella.

Bell, C. H.;

Postharvest Biology and Technology Year: 1991 Vol: 1 Issue: 1 Pages: 81-93 Ref: 22 ref.

1991

บทคัดย่อ

Diapause and cold tolerance of larvae of Ephestia elutella.

Larvae of the pyralid Ephestia elutella, a pest of stored products, were exposed to low temperatures from +5 deg C to -10 deg C after different periods of acclimation. Diapausing larvae of E. elutella were highly tolerant of low temperature exposure, requiring 4 weeks at -10 deg C or 12 weeks at -5 deg C for control. Non-diapausing larvae were much less tolerant but able to survive several weeks at 0 deg C and up to 2 weeks at -5 deg C. Accelerating the rate of temperature fall during acclimation increased the effectiveness of low temperatures in achieving kill. A 12-week exposure to a temperature cycling between 0 and -5 deg C caused little mortality. The survivors of low-temperature exposure emerged faster and with increased synchrony compared with those in control batches. To achieve control in practice, temperatures need to be reduced to well below -5 deg C for several weeks and to avoid insect acclimation, the fall needs to be rapid.