Vegetable Disease Brief – 9/4/13
There have been no new reports of Late blight.
Asparagus – Summer foliar diseases in Asparagus have been reported. With the cooler weather and all the rain we’ve have been experiencing on and off all summer disease pressure in asparagus is higher than normal (see article). [Read more…]
Vegetable Briefs 6-14-13
- Basil downy mildew has been reported near Vineland!
- Bacterial leaf spot has been reported on tomato.
- Phytophthora blight has been reported on summer squash.
- No late blight has been reported in the region to date. The Late blight found in greenhouse tomatoes in WV two weeks has been reported to be US23. To track late blight in the US please visit http://usablight.org/
- Want more information on what’s going on, please sign up for the Jersey Vegetable Crop Ag Updates at: http://jerseyvegcropsagupdates.blogspot.com/.
Vegetable Disease of the Week
Breeding for Basil Downy Mildew Resistance
Rob Pyne1, Kathryn Homa 1,2, Bill Barney1,2, Andy Wyenandt1, and Jim Simon1
1 Department of Plant Biology and Pathology, Rutgers University 2 IR-4 Program
In 2010 a basil variety and breeding line trial was conducted as an initial screen for potential sources of genetic resistance to downy mildew caused by Peronospora belbahrii, a destructive pathogen of basil introduced in the US in 2009. This trial was expanded from 30 to over 40 varieties representing six different Ocimum species in 2011. Varying levels of disease susceptibility were observed with the highest tolerance associated with O. americanum, O. citriodorum, O. gratissimum, and O. tenuiflorum varieties and USDA-GRIN accessions. In contrast, the most severe symptoms and extensive sporulation were consistently observed in O. basilicum accessions, including the popular commercial sweet basil varieties. [Read more…]
Basil downy mildew reported in southern New Jersey
Basil downy mildew has been reported in South Jersey near Vineland. This is the first report of basil downy mildew this season in New Jersey and the mid-Atlantic region. All basil growers are urged to scout their fields and consider applying preventative fungicides. The wet weather over the past week and the rains expected to come through the area later today and this later week are ideal for the development and spread of basil downy mildew.
Controlling Basil Downy Mildew
by Kathryn Homa1,2, Robert Pyne1, Bill Barney2, Andy Wyenandt1, and Jim Simon1
Department of Plant Biology and Pathology, 1Rutgers University; 2IR-4 Program
Sweet basil (Ocimum basilicum) is an economically important fresh culinary herb grown in the United States. In fall of October 2007, a new disease of basil, downy mildew (Peronospora belbahrii) was first reported in FL. [Read more…]