Field Crop Update, July 14, 2023

Erik Smith, Area Field Crop Specialist
Central New York Dairy and Field Crops

Last Modified: July 18, 2023

1. Field Observations

Corn and soybeans are enjoying the increase in rainfall, but our thoughts are with our neighbors who've experienced flooding. If you did not receive (or would like to receive) the resources I shared this Tuesday regarding flooded forages, please let me know and I will send them to you.

According to the 7-day stream flow map, the hardest-hit areas were in eastern and southeastern upstate NY, but our region has also seen extreme precipitation levels this week. These images are courtesy of Jessica Spaccio, Climatologist at the Northeast Regional Climate Center at Cornell:

7 day streamflow
NYS COOP site in Shrub Oak NY saw 8.10 inches of rain in day, a 100-year storm event with circle around area
U.S. Drought monitor map of NY
Forecast with flood watch
7 day precipitation amounts

2. Growing Degree Days (See: Climate Smart Farming Growing Degree Day Calculator)

Growing degree days (GDD) are calculated by taking the average daily temperature and subtracting the base temperature for development of a given organism ((High + Low)/2 - base temp = GDD). For corn silage, we are using base 50/86, as corn development starts at 50 degrees F and ceases above 86. Check your location and planting date:

growing degree days
growing degree days

3. Pest and disease monitoring

Western Bean Cutworm (WBC) and Fall Armyworm (FAW) in corn
WBC is hot out of the gate across our region. I scouted the Chenango Co. field with the highest number for WBC egg masses (they prefer to lay eggs on the top surface of the uppermost leaves), but found none. Something to keep an eye on….

western bean cutworm and fall armyworm count

Potato leafhopper (PLH) in alfalfa - Fields swept by Ashley Bound and Emily Anderson, CCE Chenango, who will be working with local FFA chapters across our region to sweep alfalfa fields this year (funding provided by the Chobani Community Impact Fund).

potato leafhopper in alfalfa count

*No action needed if crop is within 1 week of cutting. If not, use a short-residual insecticide.









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Spotted Lanternfly

Lycorma delicatula, or Spotted Lanternfly (SLF), is an invasive plant hopper from Asia and is an agricultural pest. In the United States, it was first found in Pennsylvania in 2014. Spotted Lanternfly has been found in New York State on Staten Island, all New York City boroughs, Long Island, Port Jervis, Sloatsburg, Orangeburg, Ithaca, Binghamton, Middletown, Newburgh, Highland, and the Buffalo area. SLF threatens the agriculture and forestry industries, and is also a nuisance pest. The nymphs and adults feed on over 70 different plants, but is especially detrimental to grapes, a black walnut, hops, maple trees and apples. New York State Ag and Markets supported CCE efforts to help bring awareness to communities and we developed this Public Service Announcement and would appreciate you sharing it with your member lists. 

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