Information on preharvest herbicide treatments for field corn and soybeans can be found in the “Weed Control Guide for Ohio, Indiana, and Illinois”, at the end of these crop sections (pages 72 and 143 of the 2020 edition). Products listed for corn include Aim, glyphosate, and paraquat, and for soybeans include Aim, paraquat, glyphosate, and Sharpen. Some dicamba products are also approved for preharvest use in soybeans, and some 2,4-D products are approved for use in corn, and these are not listed in the guide. The basic information for these follows:
Dicamba – soybeans: Apply 8 – 32 oz/A (4 lb/gal products) as a broadcast or spot treatment after soybean pods have reached mature brown color and at least 75% leaf drop has occurred; soybeans may be harvested 14 days or more after a pre-harvest application; do not use preharvest-treated soybean for seed unless a germination test is performed on the seed with an acceptable result of 95% germination or better; do not feed soybean fodder or hay following a preharvest application of this product. Continue reading →
Sclerotinia stem rot – The nights have been cool this growing season, even when the days were very warm. The fog this morning in Wayne County reminded me that this is the time of the year to begin to scout for this stem disease. Sclerotinia is caused by a fungus that survives from season to season and over several years from sclerotia. The infections actually occurred during flowering when the canopy was closed, and cool nights can really enhance and favor this disease. For this disease, disease levels can reach 20% incidence before there is a measurable yield loss. Sclerotinia will occur as single plants or a small patch of dying plants, that wilt and turn a deeper olive green color. Look at the stem and white fluffy growth will appear on the stem, this is the sign of the fungus.
Sclerotinia Stem Rot
Sudden Death Syndrome – reports that this disease is also beginning to develop in some areas of the state where soybeans are reaching R6. Symptoms include irregular yellow spots, which turn brown or necrotic between the veins. Interestingly the veins are surrounded by green. The center of the stem or pith is bright white in this disease. This is a fungal pathogen and infections most likely occurred shortly after planting and this fungus causes extensive root rots. The figure has both susceptible and resistant cultivar. There is a look-alike symptom caused by triazole fungicides when applied under hot conditions. To separate these two, if a triazole had been sprayed, look at the roots. The roots will be very healthy where SDS, the roots, and the center of the taproot are discolored. Continue reading →
This article originally appeared in Ohio’s Country Journal and Ohio Ag Net
Due to the COVID-19 pandemic, the Ohio Ag Net and Ohio’s Country Journal crop tour is moving to a virtual experience for 2020! We are inviting growers from across Ohio to send in their yield data using the form below. This data will be posted completely anonymously, however, we are asking you to enter your contact information to be eligible for a drawing for a $500 gift card to Rural King. Each field entry is another entry for the drawing.
Print our handy worksheets to help you with your calculations and to take notes in the field! You are free to make as many copies as you would like.
A new suite of crop staging videos has been built by faculty at The Ohio State University that highlight corn, soybean, and alfalfa. The videos highlight some common staging methods for each crop and connect the staging guidelines to practice using live plants in the field. The videos can be found in the “Crop Growth Stages” playlist on the AgCrops YouTube Channel: https://www.youtube.com/channel/UCbqpb60QXN3UJIBa5is6kHw/playlists. These compliment some of the wheat staging videos previously posted on the AgCrops YouTube channel as well. As the crops progress through the reproductive stages, expect some more videos to be posted! Continue reading →
With continued dry weather, spider mites are one of the main pests to remain vigilant about in field crops. They will often show up in field borders first as they move in from other habitats, for example, if nearby ditches have been mowed. Spider mites are difficult to see. Look for injury signs — yellow spotting or stippling on the upper side of leaves. In soybeans, this damage usually begins in the lower canopy and progresses upward as the mite population increases. Heavily infested leaves may also have light webbing similar to spider webs. Continue reading →
Several calls this past week for fungicide applications on corn and soybean at all different growth stages. So let’s review what might be at stake here.
Soybeans. Frogeye leaf spot and white mold on susceptible varieties when the environment is favorable for disease easily pay the cost of application plus save yield losses. Let’s dig a bit deeper. Both of these diseases are caused by fungi but the frogeye leaf spot is a polycyclic disease, meaning that multiple infections occur on new leaves through the season while the white mold is monocyclic and the plant is really only susceptible during the flowering stage. Both of these diseases are also limited geographically in the state. White mold is favored in North East Ohio and down through the central region where fields are smaller and airflow can be an issue. Frogeye has been found on highly susceptible varieties south of 70, but it is moving a bit north so it is one that I am watching.
White mold is also favored by a closed canopy, cool nights, and high relative humidity. So farmers in these areas should double-check their variety ratings first. If it is moderate to low score for resistance (read the fine print) then this year a spray may be warranted. We have gotten consistent control of white mold with Endura at R1. Herbicides that are labeled for white mold suppression have also knocked back this disease, but if a drought occurs or no disease develops, losses of 10% or greater can occur due to the spray alone. For these purposes, R1 is a flower on the bottom of 1/3 of the plants in the field. Continue reading →
Wheatfields have been or will be harvested in Ohio soon and some farmers will plant double-crop soybeans. In recent years there has been more interest from livestock producers in applying manure to newly planted soybeans to provide moisture to help get the crop to emerge.
Both swine and dairy manure can be used to add moisture to newly planted soybeans. It’s important that the soybeans were properly covered with soil when planted to keep a barrier between the salt and nitrogen in the manure and the germinating soybean seed. It’s also important that livestock producers know their soil phosphorus levels, and the phosphorus in the manure being applied, so soil phosphorus levels are kept an acceptable range. Continue reading →
Stage VC – Definition: Fehr and Caviness (1977)- Unifoliolate leaves sufficiently unrolled, so the leaf edges are not touching Pederson (2009)- Unifoliolate leaves unrolled sufficiently, so the leaf edges are not touching
Across the state, soybean growth and development is variable, ranging from early vegetative stages to flowering. However, there has been some confusion regarding the identification of the VC and V1 growth stages. This confusion is mostly due to two definitions of V1…that actually mean the same thing. The Fehr and Caviness Method (1977) is based on the number of nodes that have a fully developed leaf, whereas Pederson (2009) focuses more on leaf unrolling so that the leaf edges are no longer touching. The VC definition for both methods is the same, but the differences start to appear between the methods at V1. Fehr and Caviness define V1 as “fully developed leaves at unifoliolate nodes,” which also means that there is “one set of unfolded trifoliolate leaves unrolled sufficiently, so the leaf edges are not touching.” This second definition is common in extension publications (Pedersen, 2009). Continue reading →
The Ohio Soybean Council will be sponsoring an Ohio Soybean State of Soy webinar on Tuesday, June 9 beginning at 10:00 a.m. Ben Brown, Assistant Professor of Professional Practice in Agricultural Risk Management in the Department of Agricultural, Environmental, and Development Economics at The Ohio State University will be the featured speaker.
During this webinar, Ben Brown will speak on soybean market fundamentals, trade updates, and assistance programs. There is no cost to attend this program. For more information Click here.
Wet weather conditions last spring prevented Williams County farmers from planting over 85,000 acres (USDA-Farm Service Agency Crop Acreage Data). When fields are left unplanted or fallow, there may be a decline in beneficial mycorrhizal fungi, which is commonly referred to as fallow syndrome.
Mycorrhizae are beneficial fungi that colonize plant roots. They aid plants in scavenging for soil nutrients, by extending the root system via thread-like structures called hyphae. In return, plants provide sugars produced during photosynthesis to the mycorrhizae.
Stunting and phosphorus deficiency are common symptoms associated with the fallow syndrome. Continue reading →
Please hold Friday, January 17, 2020, for the annual NW Ohio Corn-Soybean Day in Archbold at Founders Hall on the Sauder Village Campus. Program runs from 8 am to 3 pm and includes a 3 hr Private Pesticide recertification plus 1 hour fertilizer; 2.5 hrs Commercial Recertification including 2d, 2c, core and fertilizer; and 4 hours of CCA credits. Prepaid registration is $35 if postmarked by Wednesday, January 8th. A registration form/agenda for attendees is attached; print and send in ASAP with payment. Please see the agenda for the day, located here: 2020 Corn-Soy Day agenda
“Q. Can I plant a cover crop of the same crop I was prevented from planting? Or in other words, can I use the seed I have on hand (corn, soybeans, wheat) to plant a cover crop as long as it’s at a lower-seeded rate that qualifies for the cover crop?
A. Yes. An acceptable cover crop must be generally recognized by agricultural experts as agronomically sound for the area for erosion control or other purposes related to conservation or soil improvement is planted at the recommended seeding rate, etc. The cover crop may be the same crop prevented from planting and may still retain eligibility for a prevented planting payment. The cover crop planted cannot be used for harvest as seed or grain.”Continue reading →
We have reached the time of the year where speculation about acreage for the 2019 crops begins in earnest. While the
number of acres planted to soybeans appears set to decrease, current projections indicate an intention to plant significantly more acres than necessary to reach break-even prices in Illinois under current consumption and stock level forecasts. Continue reading →