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LIFE HISTORY OF PLUTELLA PORRECTELLA, A RELATIVE OF THE DIAMONDBACK MOTH, PLUTELLA XYLOSTELLA (LEPIDOPTERA: PLUTELLIDAE)

  • D. B. Smith (a1) and M. K. Sears (a1)

Abstract

Although Plutella porrectella (L.) is similar in appearance to the diamondback moth, P. xylostella (L.), several aspects of its biology are quite different from its more common relative. P. porrectella completed two generations per year and overwintered as an early-instar larva within apical buds of dame's rocket, Hesperis matronalis (L.). Four instars were observed in larvae reared in the laboratory. An average of 30 days was required for completion of one generation at 25 °C. This species does not seem to be an alternative host for parasites of the diamondback moth as only a single parasitic wasp, Itoplectis conquisitor (Say), was reared from 228 larvae collected in the field.

Quoique Plutella porrectella (L.) est similaire en apparence à la fausse-teigne des crucifères, P. xylostella (L.), plusieurs aspects de sa biologie sont très différents de ceux de la fausse-teigne plus commune. P. porrectella a complété 2 générations par an et hiverné à l'état de premier stade larvaire à l'intérieur des bourgeons apicaux de la Julienne des Dames, Hesperis matronalis (L.). Quatre stades ont pu être observés chez des larves élevées au laboratoire. Une moyenne de 30 jours ont été nécessaires pour compléter une génération à 25 °C. Cette espèce ne semble pas être un hôte alternatif pour les parasites de la fausse-teigne, car une seule espèce, Itoplectis conquisitor (Say), a été obtenue à partir de 228 larves prélevées sur le terrain.

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References

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Butts, R. A. and McEwen, F. L.. 1981. Seasonal populations of the diamondback moth Plutella xylostella (Lepidoptera: Plutellidae) in relation to day-degree accumulation. Can. Ent. 113: 127131.
Harcourt, D. G. 1954. The biology and ecology of the diamondback moth Plutella maculipennis Curtis, in eastern Ontario. Ph.D. Thesis, Cornell Univ., Ithaca, N.Y.107 pp.
Peng, W. K. 1975. Literature review of diamondback moth control in the U.S. M.Sc. (Review paper) Wash. State Univ., Pullman, Wash.36 pp.
Real, P. 1966. Sous-famille des Plutellinae in Balachowsky, A.S. (Ed.). 1966. Entomologie appliquée à l'agriculture. pp. 218229. Masson, Paris.
Smith, D. B. and Sears, M. K.. 1982. Evidence for dispersal of diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae) into southern Ontario. Proc. ent. Soc. Ont. 113: 2127.

LIFE HISTORY OF PLUTELLA PORRECTELLA, A RELATIVE OF THE DIAMONDBACK MOTH, PLUTELLA XYLOSTELLA (LEPIDOPTERA: PLUTELLIDAE)

  • D. B. Smith (a1) and M. K. Sears (a1)

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