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Relationship between carrot weevil (Coleoptera: Curculionidae) infestation, damage, and planting dates of parsley (Apiaceae)

Published online by Cambridge University Press:  31 May 2012

Angel N. Torres  and
Casey W. Hoy
Angel N. Torres
Affiliation:
Institute Nacional de Investigaciones Agrícolas, Centro de Investigaciones Agropecuarias Táhira, Carretera Rubio-Delicias, Bramón, Táhira, Venezuela
Casey W. Hoy*
Affiliation:
Department of Entomology, The Ohio State University, Ohio Agricultural Research and Development Center, 1680 Madison Avenue, Wooster, Ohio, United States 44691
*
1Corresponding author (e-mail: hoy.1@osu.edu).
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Abstract

Seasonal activity of carrot weevil, Listronotus oregonensis (LeConte), adults, eggs, larvae, and root feeding was studied in plots of parsley, Petroselinum crispum (Mill.) Nyman ex A.W. Hill, by sampling weekly from mid-May to the first week of September in 1998 and 1999. The initial population of overwintering adults, one complete generation, and at least a partial second generation were observed. The majority of eggs were deposited in June and most of the larvae were counted in July; the greatest damage was noticed from July onward. In both 1998 and 1999, the overall seasonal means of adults, eggs, larvae, and root feeding were significantly different among plots that were planted on different dates. Root feeding and all carrot weevil life stages sampled steadily decreased from the earliest to the latest planting. Most of the damage occurred in parsley plantings sown from late February until the third week of April. The number of eggs removed from parsley plants during the first cutting was significantly different among planting dates, but the impact of this removal may not be significant in infestation reduction. Results of this study will help parsley growers to target when control measures for carrot weevil will be most effective and which plantings are most likely to be damaged.

Résumé

L'activité saisonnière des adultes, des oeufs et des larves du Charançon de la carotte, Listronotus oregonensis (LeConte), ainsi que les dégâts causés aux racines, ont été examinés dans des parcelles de persil, Petroselinum crispum (Mill.) Nyman ex A.W. Hill. Un suivi hebdomadaire a été effectué entre le mois de mai et la première semaine de septembre, au cours des années 1998 et 1999. La population initiale des adultes en hibernation, une génération complète et au moins une partie d'une seconde génération ont été étudiées. Les oeufs ont été pondus en juin, la plupart des larves ont été dénombrées en juillet et les dégâts les plus importants ont été observés à partir de juillet. Les moyennes saisonnières générales des adultes, des oeufs, des larves et des dégâts causés aux racines se sont avérés significativement différentes dans des parcelles semées à des dates différentes, tant en 1998 qu'en 1999. Les dégâts aux racines et le nombre de charançons parvenus aux divers stades du développement ont diminué graduellement entre les semis les plus hâtifs et les plus tardifs. La plupart des dégâts ont été observés dans les parcelles de persil semées entre la fin de février et la troisième semaine d'avril. Le nombre d'oeufs recueillis sur les plants de persil au cours de la première coupe différait significativement selon la date du semis, mais cette récolte n'a pas nécessairement eu un impact significatif sur la réduction des infestations. Les résultats de cette étude pourront aider les producteurs de persil à utiliser les mesures de contrôle au moment où elles seront le plus efficaces et à les appliquer aux plants qui sont le plus susceptibles d'être attaqués par les charançons.

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 1 , February 2002 , pp. 125 - 135
Copyright
Copyright © Entomological Society of Canada 2002

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