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SAMPLING PLANT BUGS, LYGUS SPP. (HETEROPTERA: MIRIDAE), IN CANOLA TO MAKE CONTROL DECISIONS1

Published online by Cambridge University Press:  31 May 2012

I.L. Wise  and
R.J. Lamb
I.L. Wise
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
R.J. Lamb
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
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Abstract

Plant bugs in the genus Lygus are pests of canola (Brassica napus L. and Brassica rapa L.) in western Canada and may require insecticidal control. Sweep-net sampling of field plots and commercial fields in southern Manitoba between 1988 and 1995 was used to develop sequential sampling plans for plant bugs in canola to facilitate control. The variance–mean relationships for plant bug catches were defined by Taylor’s power law, and the parameters of the relationships were the same for field plots and commercial fields. Sampling units of 10, 20, 50, and 100 sweeps per sample had variance–mean relationships with the same slope but different intercepts and required different minimal sample sizes. Samples taken at two crop stages had similar variance–mean relationships, but at a later crop stage the intercept of the relationship differed and the parameters were estimated with less precision. Samples taken in two ways along the edges of commercial fields and at various distances into the fields all gave similar estimates of plant bug density, justifying the use of edge sampling. Experienced samplers caught more plant bugs than inexperienced ones, although the difference was primarily due to the number of nymphs rather than adults that were collected, and this difference was less pronounced in the edge samples. Sweep-net sampling collected less than 10% of the plant bugs present in the sampling area. Sequential decision plans are presented for four sampling units and three crop stages. Sampling commercial canola with a sweep net to make decisions on the need to control plant bugs can be completed in as little as 28–35 min. The sampling is most efficiently conducted with a sampling unit of 10 or 20 sweeps taken along the edge of a field. In an independent test of the sampling method, plant bug densities were classified correctly in relation to the need for control in 20 fields using the minimum sample size.

Résumé

Dans l’ouest canadien, les punaises des plantes du genre Lygus sont des insectes ravageurs du colza (Brassica napus L. et Brassica rapa L.) qui requièrent parfois la mise sur pied de programmes de lutte au moyen d’insecticides. L’échantillonnage au filet fauchoir dans des carrés échantillons et dans des champs commerciaux du sud du Manitoba entre 1988 et 1995 a servi à établir des plans d’échantillonnages en série des punaises dans le colza pour en faciliter la lutte. Les relations variance-moyenne des captures de punaises ont été définies selon la loi de puissance de Taylor et les paramètres de la relation se sont avérés semblables dans les carrés échantillons et les champs commerciaux. Les unités d’échantillonnage de 10, 20, 50 et 100 coups de filet par échantillon avaient des relations variance-moyenne de même pente mais d’ordonnées à l’origine différentes et la taille minimum de l’échantillon devait varier d’une unité à l’autre. Les échantillons recueillis à deux stades de développement de la plante avaient des relations variance-moyenne semblables, mais, à un stade ultérieur de développement, l’ordonnée à l’origine de la relation n’était plus la même et les paramètres ont été estimés avec moins de précision. Les échantillons recueillis de deux façons le long des bordures de champs commerciaux et à diverses distances dans les champs ont tous donné des estimations semblables de la densité des punaises, ce qui justifie l’échantillonnage en bordure. Les échantillonneurs expérimentés ont récolté plus de punaises que les échantillonneurs inexpérimentés, mais les différences se manifestaient surtout par le nombre de larves recueillies plutôt que par le nombre d’adultes, et la différence était moins marquée dans les échantillons recueillis en bordure. L’échantillonnage au filet fauchoir a recueilli moins de 10% des punaises présentes dans la zone d’échantillonnage. Les plans ébauchés à la suite des échantillonnages sont présentés pour quatre des unités d’échantillonnage à trois stades de développement de la plante. L’échantillonnage au filet fauchoir des cultures commerciales de colza pour prendre des décisions quant à la pertinence d’une lutte organisée contre les punaises peut prendre aussi peu que 28–35 minutes. L’échantillonnage le plus efficace consiste en une unité d’échantillonnage de 10 ou 20 coups de filet en bordure du champ. Au cours d’un test indépendant de l’efficacité de la méthode, les densités de punaises ont été déterminées correctement en relation avec la nécessité d’une lutte dans 20 champs, en utilisant des échantillons de taille minimale.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 130 , Issue 6 , December 1998 , pp. 837 - 851
Copyright
Copyright © Entomological Society of Canada 1998

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