Field Crop Update July 21, 2022

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

July 22, 2022

PLEASE BE CAREFUL DOING FIELD WORK IN THIS HEAT - BRING EXTRA WATER AND STAY HYDRATED. There are no trophies for being too tough to quit and getting heat exhaustion!

1. Field Observations

Lots of corn either tasseled over the weekend or is currently going to tassel, which means we will now begin to track GDD from tassel for corn silage harvest forecasting (see section 2). Up to this point, GDD accumulations have been anywhere between the 30- and 15-year normals. But obviously this all changed this week, so stay tuned. 

The knapweeds are flowering, so here is a reminder of knapweed species ID and current mgmt options. And remember, biocontrol weevils are only available for spotted knapweed (and I've yet to see a single spotted knapweed in our area - only the other half-dozen-or-so species, mostly meadow and brown). To manage knapweed w/o chemicals, mow them now, as they're beginning to flower. In grass hayfields, spray the regrowth with 0.625 oz/ac Cimarron Plus + 8 oz/ac Banvel + 16 oz/ac 2,4-D Ester. As with milkweed, reigning in knapweed is a multi-year process…. (and remember to fertilize your fields!)


List and drawings of different knapweed

2. Growing Degree Days as of July 20 (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:

Table of Growing degree days as of July 20, 2022

I'm having déjà vu from last year. As soon as the corn tasseled, the temps have skyrocketed. As these forecasts for two CNY locations suggest, look for temps over the next week to be near/above record highs. ~30% above the 15-year normal:

Cumulative Growing Degree Days for Frankfort NY for the 2022 season to date

Cumulative Growing Degree Days for Oneonta NY for the 2022 season to date

3. Pest & Disease Monitoring

A. Western bean cutworm (WBC), true armyworm (TAW) and fall armyworm (FAW) in corn.

This week, insect numbers remained low in most places aside from moderate levels of pea aphid in alfalfa, which is seldom damaging to the extent where sprays are economical.  At tasseling, the window of risk for WBCW largely closes, and the cornfields where we saw the highest populations (still low by damage-causing standards) were just beginning to tassel:

Table of western bean cutworm, true armyworm, and fall armyworm in corn found

B. Potato leafhopper in alfalfa. I couldn't make it to a few of my usual fields, but those I swept were still below threshold. I'm seeing a fair number of aphids, but tons and tons of insect predators that seem to be keeping things well under control so far:

table of potato leafhopper in alfalfa

Field Crop Update July 21, 2022 (pdf; 441KB)









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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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