Diapause and overwintering capabilities of the larva of Homoeosoma electellum (Lepidoptera: Pyralidae).
Rojas R.R. | Riemann J.G. | Leopold R.A.
Before cold acclimation, diapausing mature larvae of Homoeosoma electelum (Hulst) have glycogen levels two times greater than nondiapausing mature larvae, trehalose levels are 30 times greater, and larvae have a lower supercooling point by approximately 8 degrees C. Significant increases in trehalose occured in diapausing larvae kept at 5 degrees C for 7 and 18 d and at 0 degree C after 10 d. In most cases, there was a sufficient concomitant reduction in glycogen to account for the trehalose increases. Nondiapausing larvae in the temperature treatment groups of 10, 5, and 0 degree C showed significantly greater trehalose levels over initial values; yet these levels are almost two times lower than initial levels in diapausing larvae and three times lower than the greatest levels achieved in this study by diapausing larvae cold-acclimated to 0 degree C. No specific relationship was found between temperature acclimation and supercooling capacity in diapausing or nondiapausing larvae. Nondiapausing larvae died after being held at - 10 degree C for 1 d, whereas 44% of the diapausing larvae survived to pupation after 3 d of exposure.
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