PHYSIOLOGICAL STUDIES ON HIBERNATION IN THE POTATO BEETLE, LEPTINOTARSA DECEMLINEATA SAY

Voltinism and the Induction of Aestival Diapause in the Colorado Potato Beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)

“…However, reports of aestival diapause are generally lacking or anecdotal for populations from North America (e.g., Fink 1925, Gibson et al 1925. The single experimental consideration of aestival diapause in North American field populations implicates the host plant as a major inducing factor (Hare 1983).…”

A comparison of internal and external lipids of nondiapausing and diapause initiation phase adult Colorado potato beetles, Leptinotarsa decemlineata

“…Lipid titer increases slowly until day 7 after which approximately 80% of the lipids needed for overwintering are stockpiled. Fink (1925) demonstrated a similar rapid increase in lipids prior to the beetles entering diapause, though his undefined time interval makes it difficult to make an accurate comparison. It is interesting that the period of peak lipid accumulation (days 7 to 15) in CPB coincides with the period of decreasing metabolic rates (days 7 to 15) as measured by respiration (Yocum et al, 2009a).…”

“…Diapause is a period of restricted water uptake for most insects, and the metabolic water generated from lipids may aid in survival (Wharton, 1985;Danks, 2000). In the CPB at the time of adult emergence from the soil, the lipids are approximately 8% of the dry weight of the adult beetle (Fink, 1925) and, following a period of active feeding, the lipid fraction increases to about 29% by the time the beetle enters the soil to diapause. The early non-English literature on lipids in diapausing CPB was summarized by Petrova (1976).…”

Some Aspects of the Role of Water in Insect Hibernation

“…Several workers have found that commonly there is a loss of water associated with hibernation. Breitenbecker ( 1911Breitenbecker ( , 1918 and Fink ( 1925) have observed a marked decrease in the amount of total water in the Colorado potato beetle when that insect approached the period of hibernation. Bodine ( 1921Bodine ( , 1923 has demonstrated a similar change in water content of hibernating grasshoppers.…”