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HOST DISCRIMINATION BY A CRUCIFER-FEEDING FLEA BEETLE, PHYLLOTRETA STRIOLATA (F.) (COLEOPTERA: CHRYSOMELIDAE)1

Published online by Cambridge University Press:  31 May 2012

R.J. Lamb  and
P. Palaniswamy
R.J. Lamb
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
P. Palaniswamy
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
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Abstract

The flea beetle, Phyllotreta striolata (F.), was attracted to the cruciferous plants Brassica oleracea L. and Raphanus sativus L., but not to B. campestris L. and B. napus L. which are important natural host plants, nor to Pisum sativum (L.), a legume. The presence or absence of attraction was demonstrated by exposing small groups of caged plants to natural populations and trapping beetles near the plants. In choice and no-choice laboratory feeding experiments, P. striolata fed on eight Cruciferae in the genera Brassica, Raphanus, and Sinapis but not on P. sativum. Phyllotreta striolata fed less on S. arvensis L. and S. alba L. than on plants in the other genera. Within Brassica, B. oleracea, B. napus, and B. campestris were preferred over B. juncea (L.) Czern and B. nigra (L.) Koch. Discrimination at the attraction phase of host selection did not account for discrimination shown in laboratory feeding experiments nor in the natural attack of flea beetles on cruciferous crops.

Résumé

L’altise des navets, Phyllotreta striolata (F.), était attirée par les plantes crucifères Brassica oleracea L. et Raphanus sativus L., mais pas par B. campestris L. et par B. napus L., qui sont des plantes-hôtes naturelles importantes, ni par Pisum sativum (L.), une légumineuse. La présence ou l’absence d’attraction a été démontrée en exposant des petits groupes de plantes encagées aux populations naturelles et en attrapant les altises proche aux plantes. Aux expériences d’alimentation au laboratoire présentant du choix ou non, P. striolata s’est nourri de huit crucifères du genre Brassica, Raphanus, et Sinapis, mais pas de P. sativum. Phyllotreta striolata s’est nourri moins aux plantes de S. arvensis L. et de S. alba L. qu’aux plantes des autres genres. Parmi les Brassica, les plantes de B. oleracea, B. napus et B. campestris étaient préférées à celles de B. juncea (L.) Czern et de B. nigra (L.) Koch. Le discernement à la période d’attraction pour la sélection d’hôtes n’a pas été justifié par le discernement démontré aux expériences d’alimentation au laboratoire ni à l’attaque de l’altise aux plantations crucifères.

Type
Articles
Information
The Canadian Entomologist , Volume 122 , Issue 5 , October 1990 , pp. 817 - 824
Copyright
Copyright © Entomological Society of Canada 1990

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