Project Summaries

11-912NC  Project Manager: P. F. O'Leary

THE EFFECTIVENESS OF SEED TREATMENTS AND STRATEGIC FOLIAR SPRAYS FOR THRIPS CONTROL IN THE ABSENCE OF TEMIK

Jack S. Bacheler, North Carolina State University

In a series of four replicated trials, we 1) evaluated each of the commercially available seed treatments, 2) an ultra-high rate of imidacloprid 3) Admire Pro, both as a stand-alone in-furrow spray and combined with a seed treatment and 4) a preliminary test to determine the potential benefit of a late May planting date to reduce the impact of thrips on seedling cotton.

The three commercially available seed treatments provided almost identical control of immature thrips at both three and four weeks after planting averaged over the Rocky Mount and Plymouth locations. Other indications of plant growth were likewise similar. However, our hand-mixed 8x rate of imidacloprid seed treatment provided significantly better thrips control than any of the standard seed treatments at all assessment dates. In these same tests, Admire Pro applied in furrow @ 8.5 to 9.0 oz. product/acre only provided control equivalent to the commercial seed treatments.

In the Wilson County test however, the Admire Pro in-furrow treatment at 9.0 oz. product/acre plus Avicta Complete treated seed showed significantly greater reduction in immature thrips levels at 3 and 4 weeks after planting and showed greater plant weight and height than the Avicta Complete treated seed alone. This treatment showed promise to serve as a stand-alone approach to controlling thrips (i.e., without a follow-up foliar application). If confirmed in upcoming tests planned for the southeastern states in 2013 through Cotton Incorporated CORE support, this combination product use pattern would be a significant benefit for North Carolina cotton producers.

The planting date study did not show an advantage with the later May planting date to shorten the window of seedling vulnerability to thrips via faster grow-off. However, similar tests conducted by us suggested that later planting dates show a significant benefit in reducing inputs for thrips control. In 2013, we plan to conduct additional planting date studies at multiple locations

 

Project Year: 2012
 

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