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Vegetable Crops: Applications
and Timings
Excerpt from Chapter 13, Publication 75, Guide to Weed Control, Order
this publication
Applications and Timings
- Apply all treatments in 100-200 L/ha (40-80 L/ac) water except
where otherwise noted.
- Herbicide Application Timings:
- Soil Applied Treatments include:
- Preplant (PP) - Also see Chapter
6, Special Methods of Weed Control for details of
products, rates and remarks.
- Preplant Incorporated (PPI) - 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 unless otherwise stated. Cultivation-type
equipment used for herbicide incorporation is known to
spread perennial weeds to previously uninfested areas.
Special attention should be directed toward machinery
cleanliness, and/or treating fields with perennial weeds
last.
- Preemergence (PRE) - Rainfall of 15-20
mm within 7-10 days after application is necessary to
activate preemergence treatments. Shallow cultivation,
rotary hoeing or harrowing will control weed escapes and
improves herbicide activity in the absence of rainfall.
- Postemergence (POST) - Leaf stage of the
weeds is critical for good weed control. Smaller weeds are
generally easier to kill but there needs to be enough leaf
surface to intercept to herbicide. 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
... on general Weed
topics
... on pesticide labels, search
the PMRA website
... on weed identification, order OMAFRA
Publication 505: Ontario Weeds
... on weed control, order OMAFRA
Publication 75: Guide To Weed Control
For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca
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