Institution:Board of Regents of the University System of Georgia on behalf of the University of Georgia Cooperative Extension Service and University of Georgia Research Foundation, Inc.
Region:Southeast (GA, FL, AL)
Project Fiscal Year:2017
Report Received Date:
Project NPB Budget:$42,500
Leaf spot diseases were especially severe in some fields in 2017-18. The new cul ti var "Georgia! 3M" was extremely susceptible to late leaf spot. Numerous fungicides, including all of the strobilurin fungicides (such as Abound or Headline) we've tested and all but one of the sterol inhibitor fungicides (such as tebuconazole or Alto) are much less effective than they were a few years back. Mixtures of these fungicides with fungicides with chlorothalonil or micronized sulfur, however, can still provide adequate leaf spot control. Multiple new cultivars and experimental breeding lines have field resistance to Tomato spotted wilt that is better than that of Georgia-06G. Phorate (Thimet) remains the only insecticide available that helps suppress spotted wilt. In-furrow applications of provided substantial early season control of leaf spot. The new fungicide Miravis provided exceptional control of late leaf spot under extremely heavy disease pressure.