Author： DROOZa ARNOLD T.
Publisher： Entomological Society of America
ISSN： 1938-2901
Source： Annals of the Entomological Society of America, Vol.63, Iss.2, 1970-03, pp. : 391-397
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Abstract
Laboratory studies revealed that Ennomos subsignarius (Hübner), reared on juvenile foliage from red oak or pignut hickory, had significantly greater fecundity and larval weight than did spanworms reared on normally developing foliage from these hosts. There appears to be no biological importance to difference in development time or larval head width between spanworms reared on juvenile foliage and those reared on normal foliage. Spanworms reared on hickory took less time to develop from new larvae to adults, had much wider larval head capsules, and had significantly greater fecundity than did those reared on red oak. These differences indicate that the presence of hickory in the southern Appalachian forests is very important to the population dynamics of spanworms and that it undoubtedly gives momentum to outbreaks. Diets of foliage from mockernut hickories and red oaks which had previously been manually defoliated caused little difference to the insect's biology. Observation of these trees indicates that the chief hindrance to the course of an outbreak would result from scant, late, or erratic foliation.
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