– Bill Cissel, Extension Agent – Integrated Pest Management; bcissel@udel.edu
Congratulations to Josh Emhoff for identifying the disease as net blotch and for being selected to be entered into the end of season raffle for $100 not once but five times. Everyone else who guessed correctly will also have their name entered into the raffle. Josh will also receive a FREE copy of A Farmer’s Guide to Corn Diseases. Click on the Guess the Pest logo below to participate in this week’s Guess the Pest! For Guess the Pest # 5, we will also be giving away A Farmer’s Guide To Corn Diseases ($29.95 value) to one lucky participant.
http://www.plantmanagementnetwork.org/book/cornfarmersguide/
Guess the Pest # 4
Net blotch is a common fungal leafspot of barley in our region, with severity determined by the weather (favored by cool and wet) and the susceptibility of the barley cultivar. High nitrogen fertilization early will also favor development. Net blotch and the spot blotch form of net blotch rarely get severe enough in Delaware to warrant fungicide applications. If a control measure is necessary, fungicide applications protecting the flag leaf (FGS 8 – Flower) will be the most efficacious. The pathogen can persist in residues of barley and volunteer barley. No-till fields with high levels of residue therefore, will show greater symptoms. Contaminated seed is another source of the disease. The symptoms that develop on barley can vary depending on the fungus present (there are several species or types of the fungus) and the barley cultivar. Later in the season we see the spot blotch form of net blotch more frequently than the classic square or rectangular net-like symptoms. Rotation, encouraging residue decomposition via disking, and planting clean seed are the best means of managing this disease. There is some resistance known to the net blotch form.
Guess the Pest #5
Guess the Pest? Think you know the answer…. Click on the Guess the Pest Icon below or go to https://goo.gl/forms/pWjHQUpmjABFB0v32 to submit your best guess.
