![]() ![]() Other products that have been effective in some tests include Serenade MAX, Actinovate and Trilogy. In other studies, OxiDate did not provide control (McGrath and Hunsberger, 2010, 2011). In studies done at UConn in 2011 (Allen, 2012), OxiDate and Milstop performed well. In some cases, a particular product will be effective and in other studies, it will not perform significantly better than the untreated control. In field studies, results are variable from one season or location to another. Sweet basil varieties that had less severe downy mildew in trials include ‘Red Leaf’ and ‘Red Rubin’.Ī number of biocontrol and biorational products are labeled for basil and/or downy mildew. A seed testing procedure is being developed. In greenhouses, reduce humidity by using fans, lights or raising the temperature.Avoid overhead irrigation or water early in the morning to promote leaf dryness.Promote good air circulation by using generous plant spacing and orienting the rows parallel to the prevailing wind direction.See images of symptoms and sporulation in the photos below. These sporangia are wind-blown and rain splashed to new infection sites. The sporulation is purplish brown to grayish and has a fuzzy or dirty appearance. During wet or humid weather, sporulation will be visible on the undersides of the leaves associated with the yellow areas. Early symptoms can resemble nutrient deficiency. Symptoms begin as yellowing that is restricted by the veins on the upper surface of the leaf followed by death of the leaf tissue. In resistance evaluation trials done in New Jersey (Wyenandt et al., 2009), sweet basil varieties ( Ocimum basilicum) were generally more susceptible than O. Hosts of the basil downy mildew pathogen include both culinary and ornamental basil varieties. Infection renders the basil unsuitable for fresh market sale. It is seed-borne and spreads by wind-borne spores (sporangia) that move north during the summer. The pathogen does not overwinter in the north. By 2008, it was widespread in the northeast and has been present each season since. This disease was first confirmed in the United States in Florida in 2007. Basil downy mildew is caused by the fungus-like pathogen Peronospora belbahrii. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |