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THE EFFECTS OF ALFALFA PLANT BUG (HEMIPTERA: MIRIDAE) FEEDING LATE IN THE SEASON ON ALFALFA SEED YIELD IN NORTHERN SASKATCHEWAN1

  • Juliana J. Soroka (a1) and Dorothy C. Murrell (a2)

Abstract

A 4-year field cage study was conducted to determine what effects feeding of alfalfa plant bug, Adelphocoris lineolatus (Goeze), late in the season had on alfalfa seed yields. When zero, one, two, or four alfalfa plant bugs were placed in sleeve cages containing stems of alfalfa at the green pod stage of growth, there was a significant decrease in the number of pods per cage and per raceme, the number of healthy seeds, and the weight of seeds with two or four bugs per cage. Increasing the duration of infestation resulted in significant increases in the number of damaged seeds per cage. An insecticide field trial was conducted in north central Saskatchewan in 1988 to determine what effects the occurrence of plant bugs had on seed yields of alfalfa. Alfalfa plant bug, lygus bug (Lygus spp.), pea aphid [Acyrthosiphon pisum (Harris)], and beneficial arthropod populations were monitored from 23 June to 1 September 1988. Seed yields were significantly greater in plots that were treated with trichlorfon in June and in June and August than in plots that were treated in August alone. The implications of a large alfalfa plant bug population late in the season to alfalfa seed production in the area are discussed.

Une étude d’une durée de 4 ans sur des Capsides de la luzerne [Adelphocoris lineolatus (Goeze)] dans des cages installées en nature a permis de déterminer les effets d’une alimentation saisonnière tardive de ces punaises sur la production de graines de luzerne. Lorsque zero, un, deux, ou quatre capsides étaient placés dans des cages en manchon autour de tiges de luzerne au stade des gousses vertes, il se produisait une réduction significative du nombre de gousses par cage et par grappe, du nombre de graines saines, et de la masse de graines avec deux ou quatre capsides par cage. La prolongation de l’infestation a entraîné une augmentation significative du nombre de graines endommagées par cage. Une administration expérimentale d’insecticide en nature dans le nord de la Saskatchewan a été tentée en 1988 dans le but de déterminer les effets des capsides sur la production de graines de luzerne. Les populations de capsides, de lygées (Lygus spp.), de Pucerons du pois [Acyrthosiphon pisum (Harris)] et d’arthropodes bénéfiques ont été étudiées du 23 juin au 1er septembre 1988. La production de graines était significativement plus abondante dans les champs traités au trichlorfon en juin, ou en juin et en août, que dans les champs traités seulement en août. Les conséquences de la présence d’une forte population du Capside de la luzerne tard dans la saison sur la production de graines dans la région fait l’objet d’une discussion.

[Traduit par la rédaction]

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References

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THE EFFECTS OF ALFALFA PLANT BUG (HEMIPTERA: MIRIDAE) FEEDING LATE IN THE SEASON ON ALFALFA SEED YIELD IN NORTHERN SASKATCHEWAN1

  • Juliana J. Soroka (a1) and Dorothy C. Murrell (a2)

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