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CANOLA:
Brassica napus
L. Registered and experimental insecticides were evaluated for their efficacy at controlling aphids on canola. A field in north central North Dakota near Kenmare, ND had pretreatment counts of >100 aphids per plant. Plots were 10 ft wide by 30 ft long. A RCB experimental design with four replicates was used. Insecticides were applied at late bloom-early pod stage on 6 Aug using a handheld CO2 boom sprayer at 40 PSI, and 10 GPA and fitted with XR 8001 nozzles. At 5 DAT, plant height in cm and the number of aphids in the top 10 pods and in the bottom 40 cm of stem were counted from three plants per plot. Variables were subjected to ANOVA and means compared using Fisher’s PLSD at the 5% significance level. All of the insecticide treatments had significantly lower numbers of turnip aphids on the pods and lower stems than the untreated check. There were no significant differences in the number of aphids on pods or stems between insecticide treatments. For plant height, only Capture at 2.1 fl oz/acre and Proaxis at 3.84 fl oz/acre had significantly taller plants than the untreated check. Overall, all of the insecticide treatments had taller plants than the untreated check indicating reduced plant growth from aphid injury.
Part II. Materials Tested for Arthropod Management Insecticide Efficacy Against Aphids on Canola, 2003
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Last Updated:
Tuesday, July 05, 2005 10:26:36 AM
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