Rutgers University | New Jersey Agricultural Experiment Station | Pesticide User Responsibility

Andy Wyenandt

This is an archive of Dr. Wyenandt's posts on the Plant and Pest Advisory.

June 13, 2013

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

Symptoms of downy mildew on
infected sweet basil leaf

Basil downy mildew sporulating on the
underside of an infected leaf.

Filed Under: Vegetable Crops Tagged With: ,
June 13, 2013

Vegetable Disease Update – 6/14/13

  • Basil
  • Pepper
  • Potato
  • Tomato

[Read more…]

Filed Under: Vegetable Crops
June 13, 2013

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…]

Filed Under: Vegetable Crops Tagged With: ,
June 12, 2013

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.

Filed Under: Vegetable Crops Tagged With: ,
June 7, 2013

2013 Cucurbit Downy and Powdery Mildew Management Guidelines

by Margaret McGrath, Beth Gugino, Kate Everts, Steve Rideout, Nathan Kleczewski, and Andy Wyenandt

2013 Fungicide Resistance Management Table for Cucurbit Downy and Powdery Mildew Control

Producing a high-quality cucurbit crop necessitates effectively managing downy mildew.  This foliar disease is common in the mid-Atlantic and northeast because the pathogen produces a large quantity of asexual spores that are easily dispersed long distances by wind, which enables it to spread widely.  Although the pathogen cannot survive between growing seasons where winter temperatures kill cucurbit crops, it moves throughout the eastern USA each year via its asexual spores. The pathogen does not affect fruit directly; however, affected leaves die prematurely which results in fewer fruit and/or fruit of low quality (poor flavor, sunscald, poor storability). [Read more…]

Filed Under: Vegetable Crops
June 7, 2013

Vegetable Briefs and Disease of the Week

  • Cucurbit downy mildew was reported as far north in Wayne and Nash Counties in North Carolina and Texas this past week. All cucurbit growers are urged to begin scouting. To track cucurbit downy mildew in the US please visit http://cdm.ipmpipe.org/
  • No late blight has been reported in the region to date and has only been found as far north as central Florida to-date. 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/.
  • An update and results from Penn State University on the strawberry virus survey they conducted this spring can be found here.

Vegetable Disease of the Week

Cucurbit downy mildew of cucumber

 

Filed Under: Vegetable Crops Tagged With: