Wednesday, November 15, 2006 - 9:50 AM
218-6

Aphids on Winter Canola in the Southern Plains.

Kristopher L. Giles, Thomas Peeper, Mark Boyles, Tom Royer, Deena Bushong, and Dennis Kastl. Oklahoma State Univ, 127 NRC, Stillwater, OK 74078

An initial evaluation on the complex of insect pests and their natural enemies was conducted during the 2004-2005 and 2005-2006 winter canola growing season in Oklahoma.  At multiple locations, the seasonal occurrence of insects infesting canola was documented and also evaluated within an experiment evaluating the effects of seed treated with insecticides.  Aphids were the most abundant insects found on winter canola.  Turnip aphids were prevalent on late fall and early spring growth, whereas, cabbage aphids increased to extremely high levels in the spring during flower development.  Aphid populations exceeding 2500 per plant were devastating and significantly reduced plant growth.  Insecticidal seed treatments allowed plants to remain nearly aphid-free during fall growth, and hold promise as an economical approach for establishment of healthy stands.  At most locations, natural enemies (predators and parasitoids) did not prevent aphids from reaching economic status.       

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