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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