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EFFECT OF BODY WEIGHT ON LETHAL EFFECTIVENESS OF A JUVENILE HORMONE ANALOGUE APPLIED TO MALE AND FEMALE WESTERN SPRUCE BUDWORM (CHORISTONEURA OCCIDENTALS) (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

Jacqueline L. Robertson
Jacqueline L. Robertson
Affiliation:
Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Berkeley, California 94701
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Abstract

Experiments were performed to determine the role of body weight in the response of last instar western spruce budworm, Choristoneura occidentalis Freeman, to a topically applied juvenile hormone analogue (JHA), Ro 13-5223 (Ethyl [2-(p-phenoxyphenoxy)ethyl] carbamate). The response of males in weight classes from 50 to 130 mg was not proportional to their body weight; susceptibility increased drastically in heavier larvae. The susceptibility of females increased in proportion to their body weight. The results of these experiments suggest that future investigations of JHA effectiveness in last instar Lepidoptera should consider both weight and sex as possible relevant variables. Age of the last instar may not, in itself, be an adequate measure by which to quantify JHA effects.

Résumé

Des expériences ont été effectuées afin de déterminer l'effet du poids corporel sur la réponse du dernier stade chez la tordeuse occidentale de l'épinette, Choristoneura occidentalis Freeman, à une application locale de l'analogue de l'hormone juvénile (JHA) Ro 13-5223 (Éthyle [2-(p-phénoxyphénoxy)éthyle] carbamate). La réponse des mâles des classes d'âge allant de 50 à 130 mg s'est avérée non proportionnelle à leur poids, la susceptibilité ayant augmenté de beaucoup chez les larves les plus grosses. Les résultats de ces expériences indiquent que les études sur l'efficacité des JHA chez les Lépidoptères au dernier stade devraient dorénavant considérer à la fois le poids et le sexe en tant que variables potentiellement pertinentes. L'âge durant le dernier stade n'est peut-être pas en soi une variable adéquate lorsqu'il s'agit de quantifier l'effet des JHA.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 11 , November 1982 , pp. 1063 - 1068
Copyright
Copyright © Entomological Society of Canada 1982

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References

Domencich, T. A. and McFadden, D.. 1975. Urban Travel Demand. American Elsevier, N.Y.215 pp.Google Scholar
Lyon, R. L., Richmond, C. E., Robertson, J. L., and Lucas, B. A.. 1972. Rearing diapause and diapausefree western spruce budworm (Choristoneura occidentalis) (Lepidoptera: Tortricidae) on an artificial diet. Can. Ent. 104: 417–426.CrossRefGoogle Scholar
Mullins, W. and Pieters, E. P.. 1982. Weight versus toxicity; a need for revision of the standard method of testing for resistance of the tobacco budworm to insecticides. J. econ. Ent. 75: 40–42.CrossRefGoogle Scholar
Robertson, J. L. 1979. Rearing the western spruce budworm. Canada-United States Spruce Budworms Program, Forest Serv., U.S. Dep. Agric., Washington, D.C.18 pp.Google Scholar
Robertson, J. L. and Kimball, R. A.. 1979. Effects of insect growth regulators on the western spruce budworm (Choristoneura occidentalis) (Lepidoptera: Tortricidae): I. Lethal effects of last instar treatments. Can. Ent. 111: 1361–1368.CrossRefGoogle Scholar
Robertson, J. L., Russell, R. M., and Savin, N. E.. 1981 a. POLO2: A computer program for multiple probit or logit analysis. Bull. ent. Soc. Am. 27: 210–211.Google Scholar
Robertson, J. L., Savin, N. E., and Russell, R. M.. 1981 b. Weight as a variable in the response of western spruce budworm to insecticides. J. econ. Ent. 74: 643–650.CrossRefGoogle Scholar
Russell, R. M., Savin, N. E., and Robertson, J. L.. 1981. POLO2: A user's guide to multiple probit or logit analysis. Gen. Tech. Rep. PSW-55. 37 pp., illus. Pacific Southwest and Range Exp. Stn., Forest Serv., U.S. Dep. Agric., Berkeley, Calif.Google Scholar
Savin, N. E., Robertson, J. L., and Russell, R. M.. 1982. Effect of body weight on lethal dose estimates for the western spruce budworm. J. econ. Ent. 75: 538–541.CrossRefGoogle Scholar
Siddall, J. B. 1976. Insect growth regulators and insect control: a critical appraisal. Environ. Health Perspect. 14: 119–126.CrossRefGoogle ScholarPubMed
Slama, K., Romanuk, M., and Sorm, F.. 1974. Insect Hormones and Bioanalogues. Springer-Verlag, New York. 477 pp.CrossRefGoogle Scholar
Staal, G. B. 1975. Insect growth regulators with juvenile hormone activity. A. Rev. Ent. 20: 417–460.CrossRefGoogle ScholarPubMed