9/25/2023 0 Comments Basil downy mildew![]() Basil has its own downy mildew caused by the water mold Peronospora belbahrii. The disease is also widespread in Europe.ĭowny mildews tend to be specific to certain species of plants. Since 2008, it’s become widespread in many states and has been reported in Canada and South America. began in Florida during the 2007 growing season. Pictured from left to right: Basil cultivars Prospera, Devotion, Obsession and Aroma on October 7, 2019.īasil downy mildew problems in the U.S. Downy mildew on basil is a relatively new problem. It looks and smells good and you can obviously harvest the foliage for culinary uses. To say the least, it’s a very popular plant in residential landscapes. High-volume retail basil sales at garden centers, roadside farm stands and farmers markets make basil a very profitable crop for many small-scale farmers. If the pathogen is detected in the region, growers should make frequent protectant fungicide applications before the pathogen enters the field before symptoms appear.Commercially, basil is extensively grown for greenhouse and field production. Growers should know the symptoms of basil downy mildew and monitor the field daily for detection of the pathogen. In each year of the study none of the organic fungicides tested provided an adequate level of season-long control.Ĭurrent recommendations for basil downy mildew disease control include using an integrated pest management (IPM) approach and a fungicide resistance management program. Of the products tested, the only registered products for control of basil downy mildew to-date are K-Phite, Pro-Phyt, Quadris and Ranman. The fungicides K-Phite, Pro-Phyt (phosphorous acid, 33), Zampro (dimethomorph + ametoctradin, 40 + 45), Reason (fenamidone, 11) and tank mixes of Quadris (azoxystrobin, 11) + K-Phite or Pro-Phyt or tank mixes of Ranman (cyazofamid, 21) + K-Phite alternated with combinations of Presidio (fluopicolide, 43) + K-Phite or tank mixes of Ranman + Pro-Phyt alternated weekly with tank mix of Presidio + Pro-Phyt provided the best level of control. Fungicide applications in 2012 began after basil downy mildew was found in the trial. In 2012, 7 conventional and 3 biological fungicides were evaluated with seven weekly fungicide applications over the course of the growing season. In 20, the systemic fungicide, K-Phite (phosphorous acid FRAC Code 33) provided the best level of control. Fungicide applications in 20 began before basil was infected with downy mildew. In 20, 6 conventional and 7 biological fungicides were evaluated with nine weekly fungicide applications over the course of the growing season. Once basil develops symptoms, plants are no longer marketable.ĭuring the summers of 2010 -2012 at the Rutgers Agricultural Research and Extension Center (RAREC) in Bridgeton, NJ, conventional and biological fungicides were evaluated for efficacy in field trials. Symptoms include yellowing of foliage and eventual necrosis of leaf tissue (Fig 2). The main diagnostic feature of the pathogen is the production of purplish gray sporangia that appear only on the abaxial (i.e., underside) surfaces of infected leaves (Fig 1). Unfortunately, there are currently no effective seed treatments for basil downy mildew. However, it is believed that the pathogen has spread globally via the shipment of infested seed and through natural weather cycles. The epidemiology of the pathogen is still unknown. Since then, basil downy mildew has resulted in significant losses throughout the United States. ![]() In fall of October 2007, a new disease of basil, downy mildew ( Peronospora belbahrii) was first reported in FL. ![]() Sweet basil ( Ocimum basilicum) is an economically important fresh culinary herb grown in the United States. By Kathryn Homa 1,2, Robert Pyne 1, Bill Barney 2, Andy Wyenandt 1, and Jim Simon 1ĭepartment of Plant Biology and Pathology, 1Rutgers University 2IR-4 Program
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