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A SEQUENTIAL DECISION PLAN FOR MANAGEMENT OF THE ALFALFA BLOTCH LEAFMINER, AGROMYZA FRONTELLA (DIPTERA: AGROMYZIDAE)1

Published online by Cambridge University Press:  31 May 2012

D. G. Harcourt
D. G. Harcourt
Affiliation:
Ottawa Research Station, Agriculture Canada, Ottawa K1A 0C6
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Abstract

A sequential decision plan, based on the negative binomial distribution and providing for two infestation classes, has been derived for use in management of the alfalfa blotch leafminer, Agromyza frontella (Rond.), in southern Ontario. It utilizes counts of the eggs in leaflets of alfalfa, and in economic situations will provide growers with sufficient lead time to consider alternative action strategies. An appraisal of the plan by field scouts showed that it rated the infestation status of the leafminer correctly in 48 of 51 cases. Sampling time averaged 25 min per scout per field.

Résumé

Un modèle décisionnel, basé sur la distribution binomiale négative et prévoyant une intervention à deux niveaux de population, est proposé pour la lutte intégrée contre la mineuse virgule de la luzerne, Agromyza frontella (Rond.), dans les luzernières du sud de l'Ontario. Il utilise les décomptes d'oeufs dans les folioles de la luzerne et, dans les cas de ravages anticipés, il donne aux producteurs suffisamment de temps pour envisager d'autres types d'action. Des enquêteurs ont vérifié le modèle en champ et ont démontré qu'on pouvait déterminer avec précision le niveau d'infestation dans 48 cas sur 51. L'échantillonnage a duré en moyenne 25 minutes par enquêteur par champ.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 11 , November 1983 , pp. 1513 - 1518
Copyright
Copyright © Entomological Society of Canada 1983

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