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DEVELOPMENT OF SAMPLING DESIGNS FOR EGG AND LARVAL POPULATIONS OF THE WHEAT MIDGE, SITODIPLOSIS MOSELLANA (GÉHIN) (DIPTERA: CECIDOMYIIDAE), IN WHEAT1

Published online by Cambridge University Press:  31 May 2012

M.K. Mukerji ,
O.O. Olfert  and
J.F. Doane
M.K. Mukerji
Affiliation:
Agriculture Canada Research Station, 107 Science Crescent, Saskatoon, Saskatchewan, Canada S7N OX2
O.O. Olfert
Affiliation:
Agriculture Canada Research Station, 107 Science Crescent, Saskatoon, Saskatchewan, Canada S7N OX2
J.F. Doane
Affiliation:
Agriculture Canada Research Station, 107 Science Crescent, Saskatoon, Saskatchewan, Canada S7N OX2
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Abstract

The spatial and statistical distribution of eggs and larvae of the wheat midge, Sitodiplosis mosellana (Géhin), in wheat in northeastern Saskatchewan were investigated. The highest number of each stage occurred in the top third of the head and the lowest in the bottom third. Because of this the entire wheat head is considered an adequate sample unit for density estimates of the two life stages. Sample sizes required to estimate egg and larval populations with given levels of precision were determined. A sequential sampling plan for larval populations was derived using Green’s and Iwao’s methods. Both methods gave similar results; however, the number of samples required to reach a decision was higher using Green’s method than using Iwao’s.

Résumé

On a étudié la répartition spatiale et statistique des oeufs et des larves de la cécidomyie du blé, Sitodiplosis mosellana (Géhin), dans les cultures de blé du nord-est de la Saskatchewan. Les plus fortes numérations pour chaque stade ont été obtenues dans le tiers supérieur de l’épi et les plus faibles dans le tiers inférieur. On peut conclure que l’épi entier constitue une unité d’échantillonnage convenable pour l’estimation des densités de peuplement des deux stades biologiques. On a déterminé la taille des échantillons requise pour estimer les populations d’oeufs et de larves à certains niveaux donnés de précision. Les auteurs ont dégagé un plan d’échantillonnage séquentiel de populations larvaires des méthodes de Green et d’Iwao. Les deux méthodes ont donné des résultats analogues, mais le nombre d’échantillons requis pour prendre une décision est plus élevé pour la méthode de Green que celle d’Iwao.

Type
Articles
Information
The Canadian Entomologist , Volume 120 , Issue 6 , June 1988 , pp. 497 - 505
Copyright
Copyright © Entomological Society of Canada 1988

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