Control: Field bindweed is an extremely difficult noxious weed to control because,
in part, of its taproot that may go 20 feet deep into the soil, and
which repeatedly gives rise to numerous long rhizomes.
Chemical: Herbicides labeled for use on field bindweed and
found to be effective are: picloram (Tordon 22K), dicamba (Banvel),
glyphosate (Roundup, Rodeo), and 2,4-D. Picloram and dicamba can injure
trees. Effective control can take many years with some herbicide use
strategies. Proper timing of application is critical, during late
spring, or just after full-bloom, and early fall are ideal opportunities
to apply picloram and 2,4-D.
Mechanical: Mechanical control of field bindweed is difficult
because of its low growth habit. Mowing generally has little or no
effect. Hoeing or grubbing are more effective. Cultivation at intervals
of 10 to 14 days can be effective, but 2 or more growing seasons of
diligent effort are needed to achieve stand reduction. Cultivation
intervals must continuously be maintained. Cultivation can spread
bindweed rhizomes to noninfested sites via dragging, or from being
transported on the cultivation equipment.
Biological: Biological control of field bindweed is difficult,
at best. No insects are available that effectively control this weed.
Livestock will graze bindweed as a nutritious feed; horses, however,
can develoop intestinal problems when eating primarily bindweed. Because
of its low growth habit, however, bindweed tends not to be grazed
radically enough to cause necessary plant stress. If it is, often
the site is overgrazed, which is not desireable and tends to favor
bindweed proliferation. Seed production may not be prevented, despite
efforts through grazing.
Cultural: Cultural control methods tend to work poorly towards
controlling bindweed. A productive, aggressive grass stand will tend
to slow the spread of bindweed, and to deter the establishment of
new infestations. But bindweed will survive and spread, even in a