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RELATION BETWEEN POD DAMAGE CAUSED BY LARVAE OF BERTHA ARMYWORM, MAMESTRA CONFIGURATA WALKER (LEPIDOPTERA: NOCTUIDAE), AND YIELD LOSS, SHELLING, AND SEED QUALITY IN CANOLA

Published online by Cambridge University Press:  31 May 2012

G.K. Bracken
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9

Abstract

Canola plants in 0.84-m2 field plots were exposed to 120 bertha army worm larvae per square metre, beginning at mid 5th instar, for increasing durations. Yield loss increased with feeding duration throughout the feeding period whereas the proportion of pods damaged increased rapidly at first then leveled at 45%. Pod damage was negatively correlated with plot yield but the regression was not statistically significant. More seed shelled from plants with damaged pods than from plants with no pod damage under field conditions simulating drying in the swath. Seed from damaged pods had greater proportions of green and broken seeds causing lower seed grade and these defects were evident in seed from plots with 21% or more damaged pods. Although control measures for bertha armyworm should not be undertaken before pod damage is observed, a control decision should be made before 20% of the pods are damaged.

Résumé

Des plants de colza canola en parcelles de 0.84 m2 ont été exposés à 120 larves de légionnaire bertha par mètre carré à partir du milieu du 5e stade de développement pour des périodes de plus en plus longues. Les pertes de rendement augmentent avec le temps de nutrition pendant la période d’alimentation, alors que le pourcentage de gousses endommagées s’accroît rapidement au début pour ensuite plafonner à 45%. Les dégâts sont négativement corrélés au rendement des parcelles, mais la courbe de régression n’est pas statistiquement significative. L’égrenage des plants aux gousses endommagées est plus prononcé que celui des plants aux gousses intactes dans des conditions de plein champ simultant le séchage en andains. Les grains des gousses endommagées affichent de plus fortes proportions de grains verts et cassés déclassés et ces défauts affectent les grains de parcelles dont au moins 21% des gousses des plants sont endommagées. Bien qu’aucun moyen de lutte ne devrait être utilisé avant l’observation des dégâts, la décision de combattre le ravageur doit être prise avant que 20% des gousses ne soient endommagées.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1987

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References

Bracken, G.K., and Bucher, G.E.. 1977. An estimate of the relation between density of bertha armyworm and yield loss on rapeseed, based on artificial infestations. J. econ. Ent. 70: 701705.CrossRefGoogle Scholar
Bracken, G.K., and Bucher, G.E.. 1984. Measuring the cost-benefit of control measures for bertha armyworm (Lepidoptera: Noctuidae) infestations in rapeseed. Can. Ent. 116: 591595.CrossRefGoogle Scholar
Bucher, G.E., and Bracken, G.K.. 1976. The bertha armyworm, Mamestra configurata (Lepidoptera: Nocutidae). Artificial diet and rearing technique. Can. Ent. 108: 13271338.CrossRefGoogle Scholar
Harper, R.R., and Berkenkamp, B.. 1975. Revised growth-stage key for Brassica campestris and B. napus. Can. J. Pl. Sci. 55: 657658.CrossRefGoogle Scholar
Turnock, W.J., and Bilodeau, R.J.. 1985. A comparison of three methods of examining the density of larvae of the bertha armyworm, Mamestra configurata, in fields of canola (Brassica spp.). Can. Ent. 117: 10651066.CrossRefGoogle Scholar

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RELATION BETWEEN POD DAMAGE CAUSED BY LARVAE OF BERTHA ARMYWORM, MAMESTRA CONFIGURATA WALKER (LEPIDOPTERA: NOCTUIDAE), AND YIELD LOSS, SHELLING, AND SEED QUALITY IN CANOLA
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RELATION BETWEEN POD DAMAGE CAUSED BY LARVAE OF BERTHA ARMYWORM, MAMESTRA CONFIGURATA WALKER (LEPIDOPTERA: NOCTUIDAE), AND YIELD LOSS, SHELLING, AND SEED QUALITY IN CANOLA
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RELATION BETWEEN POD DAMAGE CAUSED BY LARVAE OF BERTHA ARMYWORM, MAMESTRA CONFIGURATA WALKER (LEPIDOPTERA: NOCTUIDAE), AND YIELD LOSS, SHELLING, AND SEED QUALITY IN CANOLA
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