Summer 2009 Blueberry Herbicide Evaluations

Gary K. England, William M. Stall, Ken Muzyk

Abstract


There continues to be a trend of growers starting or expanding blueberry plantings in west-central Florida. Managing weeds in blueberry plantings continues to be one of the main production challenges that growers face. A majority of the commercial blueberries are produced in pine bark culture. Drawing from the results of several trials that were conducted between 2007 and early 2009 on blueberry plantings in pine bark culture, two blueberry herbicide studies were initiated to evaluate some of the promising compounds under summer conditions. Just after postharvest pruning, a trial evaluating four labeled products and one promising herbicide was initiated in a 4-year-old southern highbush blueberry planting in pine bark culture in June 2009. At 61 d after treatment (DAT) rating, treatments containing Surflan and Chateau were providing excellent control of garden spurge (Chamaesyce hirta; EPHHI), significantly better than the other treatments. The trend indicated that the same treatments resulted in the best control of spiny amaranth (Amaranthus spinosus; AMASP) and Brazilian pusley (Richardia brasiliensis; RCHBR). Rely 200 herbicide is approved as a non-selective postemergence herbicide alternative to products containing glyphosate. A trial was established in a new blueberry planting in pine bark culture to evaluate an experimental additive for Rely 200 that may enhance the control of perennial weed species. At 34 DAT evaluation, Rely 200 at 5 pt/acre + AA10717 at 5 fl oz/acre was providing good common bermudagrass (Cynodon dactylon; CYNDA) control that was significantly better than Rely 200 at 5 pt/acre alone.

Keywords


blueberry, herbicide trial

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283