NORTHERN "AG" EXPOSURE

by Mark Miller
Rolette County Extension Agent

Livestock Scale Meeting

Published Turtle Mt. Star July 2,2001

A rancher scale meeting will be held on July 6, at the Rolette Memorial Building beginning at 9:00 am. People interested in a county owned scale for weighing livestock are encouraged to attend. For more information please contact Darrel Graber at 246-3286.

TIMING FUNGICIDE APPLICATIONS ON CANOLA

Those who read last week’s articles on fungicides for Sclerotinia suppression in canola may have wondered about timing of these products. The timing stated on the Quadris and Ronilan labels appears to be overlapping: Quadris is to be applied at 10-25% bloom, or 3-7 days after the onset of bloom; Ronilan is to be applied at 20-50% bloom, or 4-8 days after the onset of bloom. Keeping in mind that temperature can affect how fast
different bloom stages appear, it still would seem like there should be more than a day difference in the timing of applications of these two products.

The Canola Production Manual (www.canola-council.org) provides the following information for Argentine canola: 10% bloom = 10 flowers on the main stem, which may occur 2-4 days after the onset of bloom; 20% bloom = 14-16 flowers on the main stem, which may occur 1-2 days after 10% bloom; 30% bloom = 20+ flowers on the main stem, which may occur 2 days after 20% bloom.

Specific comments on the timing of each product follow:

Quadris should be applied at 10-25% bloom. This would be when there are 10 to 18 flowers on the main stem. Quadris will be most effective if applied before the first petals drop; thus, it should not be applied after 25% bloom.

Ronilan should be applied at 20-50% bloom. The 20% bloom stage would be when there are 14-16 flowers on the main stem. Determining 50% bloom is more difficult. This is the stage of  maximum color, but that is difficult to determine until after that stage has passed. At 40% bloom, there will be a few small pods at the base of the main stem. At 50% bloom, some of the lowest pods will begin to elongate, but the pods will extend less than half way up the main stem (probably 1/3 of the way up the main stem). At 60% bloom, there will be pods extending over half way up the main stem (probably 2/3 of the way up the main stem). Refer to the color photos depicting the different bloom  stages, as illustrated in the color brochure from BASF.

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Updated June 11,2001 Shelley Armstrong,Webmaster