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ECONOMIC THRESHOLDS AND ECONOMIC INJURY LEVELS OF CEREAL APHIDS ON BARLEY IN SOUTHWESTERN QUEBEC

Published online by Cambridge University Press:  31 May 2012

S. A. Ba-Angood  and
R. K. Stewart
S. A. Ba-Angood
Affiliation:
Department of Entomology, Macdonald Campus of McGill University, Ste. Anne de Bellevue, Quebec H9X 1C0
R. K. Stewart
Affiliation:
Department of Entomology, Macdonald Campus of McGill University, Ste. Anne de Bellevue, Quebec H9X 1C0
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Abstract

Artificial infestations of cereal aphids in caged plants were made at different growth stages of barley in the field in 1978 and 1979. Forty, 80, 160, and 200 aphids/tiller reduced grain yield significantly (P < 0.01) when introduced into caged plants at flowering and milky stages for 2 weeks. Only the 150 and 200 aphids/tiller-treatments gave significant reductions in yield when introduction was at the mealy ripe stage. Twenty aphids/tiller gave a significant reduction in yield only when they were introduced at the beginning of ear emergence and flowering, but not at the milky ripe stage. Significant reduction in percentage protein was obtained only when 160 and 200 aphids/tiller were introduced at flowering and milky ripe stages. The economic injury and threshold levels were calculated as 10–18 and 8–16 aphids/tiller, respectively, depending on rate of increase of aphids, costs of chemical control, and the value of the crop in 1978 and 1979.

Résumé

Des infestations artificielles de pucerons des céréales sur des plants d’orge en cage ont été faites à différents stades de croissance en 1978 et 1979. Lorsque 40, 80, 160 et 200 pucerons par talle ont été introduits pour deux semaines sur des plants en cage à la floraison et au stade laiteux, le rendement en grain a été réduit significativement (P < 0.01). Seuls les niveaux d’infestation de 160 et 200 pucerons par talle ont occasionné des réductions significatives de rendement quand cette infestation a été faite au stade farineaux. Vingt pucerons par talle ont causé une diminution significative du rendement seulement lorsqu’ introduit au début de la montaison et de la floraison mais pas au stade laiteux tardif. Des réductions significatives du pourcentage de protéine sont été obtenues seulement lorsque 160 et 200 pucerons par talle ont été introduits à la floraison et au stade laiteux tardif. Le niveau de dommage économique et le seuil économique sont respectivement de 10–18 et 8–16 pucerons par talle, selon le taux de multiplication des pucerons, les coûts de contrôle chimique et la valeur de la récolte en 1978 et 1979.

Type
Articles
Information
The Canadian Entomologist , Volume 112 , Issue 8 , 01 August 1980 , pp. 759 - 764
Copyright
Copyright © Entomological Society of Canada 1980

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