dry bean weed management - field crop newsfieldcropnews.com/wp-content/uploads/2015/04/... · dry...
TRANSCRIPT
Dry Bean Weed Management Dr. P.H. Sikkema – University of Guelph (Ridgetown Campus)
Dry Beans Which herbicide should I tank-mix with Pursuit
Frontier Treflan
Dry Beans Herbicide Use – Soil applied
% A
cres
Tre
ated
Treflan, Rival and Bonanza
• Only registered on black, kidney & white beans
• Excellent full season annual grass control
• Some control or suppression of broadleaves
• Must be applied PPI
• Pursuit tankmix for white beans
General Comments
Treflan, Rival and Bonanza
• Injury rarely occurs in dry beans
• Injury is more likely …
– When the crop emerges slowly
– On light textured soils that are low in organic matter
Injury
Control – Adzuki Beans
Treflan 960 mL/ac
Dual and Frontier • Registered on all market classes of dry
beans – Not registered on adzuki beans
• Excellent annual grass control – Weak on fall panicum, proso millet and
sandbur
Dual and Frontier • Some control/suppression of broadleaf
weeds – Eastern black nightshade and
pigweed – Frontier provides greater broadleaf weed
suppression • Dual is more consistent on yellow nutsedge • Pursuit tankmix (PPI or PRE)
• Marginal chlorosis of the unifoliates followed by necrosis
• Unifoliates may be completely burnt off
• Leaf distortion (crinkling) of the first trifoliate
• Delay in plant development
Injury Symptoms Dual and Frontier
Frontier Injury Sikkema, UG
Dual injury symptoms
Sikkema, UG Sikkema, UG
Sikkema, UG
Frontier injury symptoms in white beans
Sikkema, UG Sikkema, UG
Sikkema, UG Sikkema, UG
• On small seeded market classes (white & black)
• When applied PRE (PPI is safer)
• When heavy rainfall occurs at bean emergence following a PRE application
• If the beans have started to emerge
• On coarse-textured soils low in organic matter
– Use the lower rate on the label
Increased potential for injury … Dual and Frontier
Dry Beans Dual (700 mL/ac) + Pursuit (125 mL/ac)
Sikkema, UG
Thank You Todd Cowan & Christy Shropshire
Herbicide Manufacturers
Ontario Coloured Bean Growers’ Association
Ontario White Bean Producers
Agriculture and Agri-Food Canada
Agricultural Adaptation Council Sikkema, UG
Peter H. Sikkema University of Guelph
Ridgetown Campus