Excerpt from Chapter 4, Publication 75, Guide to Weed Control, Order
|Guaranteed active concentration
||(1:3.7) 305 g/L
|Crop and/or Non-Crop Registrations:
||Weed and brush (including conifer) control in non-crop
locations, industrial sites and rights-of-way.
||Most broadleaf herbaceous weeds including Canada
thistle, sweet and red clover,
deciduous and coniferous woody plants except white ash.
|Uptake and Translocation:
||Rapidly absorbed by the roots, stems and foliage.
Translocation can be up or down but, like 2,4-D, accumulation
is in young, rapidly growing meristematic tissue.
|Basis of Selectivity
||Effects on nucleic acid metabolism and growth are
not observed in grasses and other tolerant species.
||For deciduous and coniferous brush, apply either
broadcast using a fixed nozzle (constant volume per hectare) or
selectively using a spray gun (variable volume per hectare). As
spray gun applications use a more dilute spray mix, this type
of application must thoroughly wet the foliage, stem and root
collar. Brush should be treated after foliage is well developed
in spring or early summer. To ensure thorough coverage and minimize
drift, brush to be treated should be less than 2.5 m tall. For
cut-surface treatment, mix with water or ethylene glycol (to reduce
the freezing point, if necessary) and apply to cover the cambium
layer of freshly cut stumps. For broadleaf herbaceous weeds, apply
broadcast in spring or early summer after growth begins.
||Soil residue carryover into the year following
application is minimal when applied at recommended rates. Degradation
is most rapid under warm, humid conditions. Because small residues
of picloram in soil can be phytotoxic to crops such as soybeans,
tobacco, tomatoes, potatoes, grapes and many desirable ornamental
plants, picloram may not be applied to land used, or land that
may be used, for the production of agricultural and horticultural
||A permit from the Ministry of the Environment is
required for the purchase and use of picloram/2,4-D in Ontario.
Picloram/2,4-D must not be applied over, or near, areas where
roots of desirable trees or other plants may extend. Because spray
drift is phytotoxic to sensitive plants, an approved drift-control
system or additive is recommended when making low-volume applications
adjacent to desirable trees or crops.
|Manufacturer / Registrant
Agrosciences Canada Inc.
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