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RELATIONSHIP BETWEEN INFESTATION LEVELS AND YIELD LOSS CAUSED BY WHEAT MIDGE, SITODIPLOSIS MOSELLANA (GÉHIN) (DIPTERA: CECIDOMYIIDAE), IN SPRING WHEAT IN SASKATCHEWAN1

Published online by Cambridge University Press:  31 May 2012

O.O. Olfert ,
M.K. Mukerji  and
J.F. Doane
O.O. Olfert
Affiliation:
Agriculture Canada Research Station, 107 Science Crescent, Saskatoon, Saskatchewan, CanadaS7N 0X2
M.K. Mukerji
Affiliation:
Agriculture Canada Research Station, 107 Science Crescent, Saskatoon, Saskatchewan, CanadaS7N 0X2
J.F. Doane
Affiliation:
Agriculture Canada Research Station, 107 Science Crescent, Saskatoon, Saskatchewan, CanadaS7N 0X2
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Abstract

Losses in yield of spring wheat due to infestations of Sitodiplosis mosellana (Géhin) were determined for 700 000 ha of arable land in northeast Saskatchewan, Canada in 1983. The proportion of kernels infested (y) was a power function of the number of wheat-midge larvae (x) (y = 35.3x0.725). One, 2, 3, and 4 larvae per kernel resulted in a level of infestation of 38, 58, 78, and 96%, respectively. There was no significant difference between infestation levels from fields sampled at the heading stage of crop growth and the estimates of infestation levels for these fields at harvest time. Yield of grain (y) was negatively exponential to an increase in level of infestation (x) (ln y = 5.7−0.017x). Infestations of 30, 60, and 90% reduced yields of spring wheat by 40, 65, and 79%, respectively. The average decrease in crop yield in the study area was about 30%, which resulted in estimated losses in total gross revenue of about $30 million.

Résumé

Les pertes de rendement dans le blé de printemps dues aux infestations de Sitodiplosis mosellana (Géhin) ont été établies pour 700 000 ha de terre arable dans le nord-est de la Saskatchewan au Canada en 1983. La proportion de grains infestés (y) s'est avérée une fonction exponentielle du nombre de larves de la cécidomyie du blé (x) (y = 35,3x0.725). La présence de 1, 2, 3 et 4 larves par grain correspondait à 38, 58, 78 et 96% d'infestation, respectivement. On n'a pas observé de différence significative entre les niveaux d'infestation de champs échantillonnés au stade épiaison du blé, et leurs niveaux d'infestation à la récolte. Le rendement en grain (y) était négativement lié de façon exponentielle au niveau d'infestation (x) (ln y = 5,7−0,017x). Des infestations de 30, 60 et 90% ont réduit le rendement du blé de printemps de 40, 65 et 79%, respectivement. La baisse moyenne de rendement dans la région étudiée était d'environ 30%, causant des pertes de revenus bruts estimées à $30 millions.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 5 , May 1985 , pp. 593 - 598
Copyright
Copyright © Entomological Society of Canada 1985

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