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ARS Home » Southeast Area » Auburn, Alabama » Soil Dynamics Research » Research » Publications at this Location » Publication #124762

Title: EFFECT OF BITTERCRESS SIZE AND GALLERY RATE ON POSTEMERGENCE BITTERCRESS CONTROL

Author
item ALTLAND, JAMES
item GILLIAM, CHARLES
item EDWARDS, JAMES
item KEEVER, GARY
item KESSLER, J
item EAKES, D

Submitted to: Journal of Environmental Horticulture
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/5/2000
Publication Date: N/A
Citation: N/A

Interpretive Summary: Two experiments were conducted to evaluate how effective the rate of the herbicide "Gallery" (isoxaben) was on the control of the weed hairy bittercress. The size of the bittercress was also considered. Treatments were applied at three different rates to bittercress characterized as either small, intermediate, or large. Across all rates, Gallery provided 92% control of small bittercress, 71% control of intermediate bittercress, and only 48% control of large bittercress. Gallery provided better bittercress control with fewer bittercress per container when applied to small or intermediate sized bittercress than when applied to large bittercress.

Technical Abstract: Two experiments were conducted to evaluate the effect of Gallery (isoxaben) rate and hairy bittercress (Cardamine hirsuta L.) size on postemergence bittercress control and subsequent preemergence bittercress control. Treatments included Gallery applied at 0.56, 1.12, and 2.24 kg ai/ha (0.5, 1.0, and 2.0 lb ai/A), Image (imazaquin) applied at 0.070 kg ai/ha (0.06 lb ai/A), and a non-treated control. Treatments were applied to bittercress characterized as either small, intermediate, or large. A Gallery rate x bittercress size interaction for postemergence bittercress control was observed in experiment 1. At 28 days after treatment (DAT), the lowest Gallery rate provided less than 40% control across all bittercress size, while the high rate provided 86 to 91% bittercress control across all bittercress sizes. In experiment 2 at 14 DAT, bittercress control increased linearly with increasing Gallery rate. Across all rates, Gallery provided 92% control of small bittercress, 71% control of intermediate bittercress, and only 48% control of large bittercress. In both experiments, Image provided 92 to 100% bittercress control of small and intermediate bittercress, and 83 to 96% control of large bittercress. Gallery provided better subsequent preemergence bittercress control with fewer bittercress per container at 60 DAT when applied to small or intermediate sized bittercress than when applied to large bittercress (experiment 2). 'Natchez' crapemyrtle was not affected by any treatment.