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COOLING EGGS OF EUTRAPELA CLEMATARIA (LEPIDOPTERA: GEOMETRIDAE) TO −10°C FORESTALLS DECLINE IN PARASITE PRODUCTION WITH OOENCYRTUS ENNOMOPHAGUS (HYMENOPTERA: ENCYRTIDAE)

Published online by Cambridge University Press:  31 May 2012

A. T. Drooz  and
M. L. Weems
A. T. Drooz
Affiliation:
USDA Forest Service, Southestern Forest Experiment Staton, Forestry Sciences Laboratory, Research Triangle Park, North Carolina 27709
M. L. Weems
Affiliation:
USDA Forest Service, Southestern Forest Experiment Staton, Forestry Sciences Laboratory, Research Triangle Park, North Carolina 27709
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Extract

Drooz and Solomon (1980) demonstrated that the thelyotokous egg parasite, Ooencyrtus ennomophagus Yoshimoto, could be reared on host eggs stored at −10°C for long periods but they did not investigate the relationship between the age of a multivoltine host's eggs prior to storage and production of parasites. For eggs not stored, Kaya and Anderson (1976) stated, “Only eggs collected before embryonation occurred produced O. ennomophagus.” Bustillo and Drooz (1977) showed a decline in production of the egg parasite Telenomus alsophilae Viereck as age of eggs of the multivoltine geometrid Oxydia trychiata (Guenée) increased. Fedde et al. (1979) also expressed the importance of using fresh host eggs to maintain high rates of parasitism by T. alsophilae on the multivoltine geometrid Eutrapela clemataria (J. E. Smith). We report here that cold treatment of the eggs of E. clemataria alters them, making them more suitable for mass rearing of O. ennomophagus after embryonation has begun.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 12 , December 1982 , pp. 1195 - 1196
Copyright
Copyright © Entomological Society of Canada 1982

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References

Bustillo, A. E. and Drooz, A. T.. 1977. Cooperative establishment of a Virginia (USA) strain of Telenomus alsophilae on Oxydiatrychiata in Columbia. J. econ. Ent. 70: 767–770.Google Scholar
Drooz, A. T. and Solomon, J. D.. 1980. Rearing the egg parasite Ooencyrtus ennomophagus (Hymenoptera: Encyrtidae) on eggs of Clostera inclusa (Lepidoptera:Notodontidae) kept below freezing. Can. Ent. 112: 739–740.CrossRefGoogle Scholar
Fedde, G. F., Fedde, V. H., and Drooz, A. T.. 1979. Biological control prospects of an egg parasite, Telenomus alsophilae Viereck. pp. 123–127 in Current Topics in Forest Entomology. Selected papers from the XV Int'l Cong. of Ent. U.S. Dep. Agric., For. Serv. Gen. Tech. Rep. WO-8. 174 pp.Google Scholar
Kaya, H. K. and Anderson, J. F.. 1976. Alternate hosts of the elm spanworm egg parasitoid, Ooencyrtus ennomophagus. Ann. ent. Soc. Am. 69: 35–37.Google Scholar