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PHENOLOGY OF HOPLOCAMPA MONTANICOLA ROHWER (TENTHREDINIDAE) AND ANTHONOMUS QUADRIGIBBUS SAY (CURCULIONIDAE) ON THEIR HOST PLANT AMELANCHIER ALNIFOLIA NUTT. (ROSACEAE) IN SASKATCHEWAN

Published online by Cambridge University Press:  31 May 2012

R.G. St. Pierre  and
D.M. Lehmkuhl
R.G. St. Pierre
Affiliation:
Department of Biology, University of Saskatchewan, Saskatoon, Canada S7N 0W0
D.M. Lehmkuhl
Affiliation:
Department of Biology, University of Saskatchewan, Saskatoon, Canada S7N 0W0
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Abstract

Adult Hoplocampa montanicola Rohwer emerged in mid-May, 6.2 ± 3.2 days (mean ± SE) prior to the period of peak anthesis in Amelanchier alnifolia Nuttall. Oviposition, one egg per flower, occurred during the period of petal drop in late-May; a mean ± SE of 2.2 ± 0.2 eggs were deposited in each inflorescence. Eggs hatched 7.7 ± 3 days (mean ± SE) after the period of primary petal drop and larvae fed on a mean ± SE of 1.8 ± 0.14 fruit per infructescence. Larvae completed development by the end of June, just as the first fruit of A. alnifolia were beginning to ripen. Larvae overwintered in the leaf litter.

Adult Anthonomus quadrigibbus Say (previously assigned to the genus Tachypterellus) were first collected in mid- to late-May during the periods of anthesis and fruit drop in A. alnifolia. Immature fruit fed upon were often extensively damaged. Oviposition occurred toward the end of fruit drop in A. alnifolia, 30.6 ± 2.5 days (mean ± SE) after the period of peak anthesis. Only one egg was laid in a puncture at the base of a fruit. Larval feeding was restricted to ovules and occurred in fruit retained on the plant. Pupation and adult emergence occurred in mid-July as fruit were ripening. The new generation of adults then entered the leaf litter to overwinter.

Résumé

Les adultes d’Hoplocampa montanicola Rowher se sont écloses à la mi-mai, 6,2 ± 3,2 jours (moyenne ± erreur-type) avant la période d’anthèse d’apogée d’Amelanchier alnifolia Nuttall. La ponte, un oeuf par fleur, a eu lieu pendant la période de perte de pétales vers la fin mai; en moyenne (± erreur-type), 2,2 ± 0,2 oeufs ont été laissés dans chaque inflorescence. Les oeufs se sont éclos 7,7 ± 3 jours (moyenne ± erreur-type) suivant la période de perte de pétales primaires et les larves se sont nourries en moyenne ± erreur-type 1,8 ± 0,14 fruits par infructescence. Les larves ont terminé leur développement par la fin juin, au moment quand les fruits premiers d’A. alnifolia ont commencé à mûrir. Les larves ont hivernées dans la litière de feuilles.

Les adultes d’Anthonomus quadrigibbus Say (attribué auparavant au genre Tachypterellus) ont été prise premièrement pendant la mi- à la fin mai, pendant les périodes d’anthèse et perte de fruits d’A. alnifolia. Les fruits non mûris qui ont été mangés, ont fréquemment été considérablement endommagés. La ponte a eu lieu vers la fin de la perte de fruits d’A. alnifolia, 30,6 ± 2,5 jours (moyenne ± erreur-type) après la période d’anthèse d’apogée. Un oeuf seul a été déposé dans une piqûre à la base d’un fruit. L’alimentation larvaire a été restreinte aux ovules et a eu lieu à la mi-juillet au moment quand mûrissaient les fruits. La génération nouvelle d’adultes s’est alors entrée dans la litière de feuilles pour hiverner.

Type
Articles
Information
The Canadian Entomologist , Volume 122 , Issue 5 , October 1990 , pp. 901 - 906
Copyright
Copyright © Entomological Society of Canada 1990

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