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Beans (Adzuki, Dry, Lima and Snap)
 Excerpt
from 2010-11 Publication 75, Guide to Weed Control, Order
this publication
Introduction
- Dry Beans include black, cranberry, Dutch brown, kidney, mung, otebo,
pinto, small red Mexican, yellow eye and white bean market classes.
- Apply all treatments in 150-300 L/ha (60-120 L/ac) water unless
otherwise specified.
- When developing a weed control program, consider cultivation, rotation
and other cultural practices along with herbicide treatments. Any single
method of weed control, or the continuous use of the same chemical,
can lead to the build up of weeds resistant or tolerant to that control
method. Rotating crops and/or other control methods reduce the chance
of developing new or unique weed infestations
- High speed (10-20 km/hr) shallow (2.5-3 cm) cultivation with a rotary
hoe when the beans are in the 1-2 leaf stage helps control small weed
seedlings. This technique does not reduce herbicide action and may,
in some years, enhance chemical weed control and improve crop safety.
- Inter-row cultivation may be needed when weeds escape herbicide treatment;
consider weeds 'escapes' when they are 5-7 cm high. Cultivate shallow
to prevent exposure of untreated soil and germination of new weed seeds.
- Band treatment of chemical over the row reduces costs by one-half
to two-thirds, depending on the row spacing and width of band. Shallow
inter-row cultivation will be required to control weeds between the
bands.
- Cultivation will give some control of established perennial weeds
but may also help to spread them to previously uninfested areas. Machinery
sanitation is important when moving from one field to another.
- Some chemicals may also be impregnated on dry bulk fertilizer. Check
the label for recommended fertilizer ingredients. Please refer to Table
7-1. Beans (Dry, Lima and Snap) Herbicide Weed Control Ratings,
page 87 to determine which market classes of edible beans are registered
for the herbicide treatments listed.
- Rates and application techniques vary for trifluralin
products. For further information on these and other chemicals refer
to label recommendations and also "Notes on Chemicals",
on page 31.
Herbicide Application Timings:
- Preplant (PP) - Also see Preplant
Weed Control, Pre-plant-Site Preparation Prior to Any Crop,
on page 81 for details of products, rates and remarks.
- Preplant Incorporated (PPI) - Unless stated otherwise,
two incorporations at right angles operating at a depth of 10 cm using
a double disk (7-10 km/hr) or vibrating shank S-tine cultivator
(10-13 km/hr) are required. Cultivation-type equipment used for herbicide
incorporation is known to spread perennial weeds to previously uninfested
areas. Pay special attention to machinery cleanliness and/or treating
fields with perennial weeds last.
- Preemergence (PRE) - Rainfall of 15-20 mm within
10 days after application is necessary to activate preemergence treatments.
Shallow cultivation, rotary hoeing or harrowing will control weed
escapes and improve herbicide activity in the absence of rainfall.
- Postemergence (POST) - Leaf stage of the weeds is
critical for good weed control. Smaller weeds are usually more sensitive
to herbicide injury. Apply according to recommended leaf stages. Crop
stage is important to optimize crop safety. Adjuvants will frequently
improve the weed control when used as directed. Weather or other conditions
may influence the optimum rate of adjuvant, see the product label for
more details. Always use appropriate drift management technology.
Related Links
For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca
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