Corn Diseases in Southwest NY
Joshua Putman, Field Crops and Forage Specialist
Southwest New York Dairy, Livestock and Field Crops Program

The 2019 growing season was favorable to diseases in our corn and soybean production systems. In southwest NY, Northern Corn Leaf Blight (NCLB) and Grey Leaf Spot (GLS) showed up and spread throughout our corn fields. Northern corn leaf blight fungus survives the winter on infected corn residue and remains on the soil surface. As temperatures increase in the spring, the fungus produces spores which then splash or are wind-blown onto the lower canopy of the corn plants. Last year, the cool, wet summer allowed for early appearance in our corn fields. Grey leaf spot is a destructive disease that can significantly reduce yields. Just like NCLB, the disease survives on corn residue on the soil surface and splash from the soil surface onto the lower leaves of a corn plant. The wind can carry the spores to a neighboring field if the disease is present in the crop residue. These two diseases can result in 10-50% yield reductions if the timing and conditions are favorable. Weather is the primary influence on the development of these diseases, but proper management with hybrid selection and use of an in-season fungicide will help limit the exposure to these diseases. Contact your local extension specialist for correct identification and management of these pests!
For more information see: https://www.extension.purdue.edu/extmedia/BP/BP-56-W.pdf;
https://www.extension.purdue.edu/extmedia/BP/BP-84-W.pdf
Upcoming Events
Driving Efficiency in Dairy & Exploring the Irish Experience
September 29, 2025
Rock Stream, NY
This workshop series will feature in-depth presentation and discussion led by Dr. Padraig French who is the Head of Livestock Systems and the Dairy Enterprise Leader at Teagasc (the Irish version of USDA). Dr. French will focus on the critical success factors for Irish dairy, which include pasture utilization, labor efficiency and managing for seasonal calving. The discussion will focus on ways that U.S. dairy farmers can use some of the Irish dairy techniques to become more profitable with grass farming.
Open Forum to Discuss Newly Approved DOL Trade, "Butcher"
October 2, 2025 : Open Forum to Discuss Newly Approved DOL Trade, "Butcher"
Partners from New York State Dept. of Labor, Cornell Cooperative Extension, Southern Tier West, and Workforce Development will be in the space to provide an overview of the new program, discuss the roles of hosts and apprentices, review the benefits of hosting an apprentice, and setting the vision for building a corps of highly skilled, modern trained Butchers and validating this career as a skilled trade with respectful earning potential.
Silvopasture on a Shoestring
October 7, 2025
Franklinville, NY
Join Joshua Greene, Director of Education at Trees For Graziers, Jonathan Bates, Statewide Agroforestry Educator, and Lynn Bliven, owner of Wild Geese Farm for a full day training event that will include classroom and hands-on sessions. The focus will be on DIY silvopasture projects on small grazing farms. We will address the practical considerations of tree establishment, protection, and maintenance while learning how silvopasture can help address your farm's resource concerns and enhance livestock grazing.
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