Corn

There exists a lack of control efficacy information to enable decision-making about which organic insecticide product works best for a given insect pest. Here we summarize results of 153 field trials on the control efficacy of common active ingredients in organic insecticides against groups of the most difficult to control insect pests. The performance of organic products Entrust (spinosad), Azera (pyrethrin and azadirachtin), PyGanic (pyrethrin) and Neemix (azadirachtin) varied widely among pest groups, as well as among pest species within a group, providing an overall reduction in pest infestations by 73.9%, 61.7%, 48.6% and 46.1%, respectively.

August IPM insect scouting tips on soybean, field corn, and sorghum.

Before anyone panics, this disease has not been confirmed in Maryland; however, it is close by and could potentially spread to our state. As you’re scouting fields this summer, keep this one in the back of your mind. Tar spot is a fungal disease of corn caused by Phyllachora maydis. It was first discovered in the United States in 2015. In Latin America where tar spot is more common, another fungal species, Monographella maydis, is known to occur in complex with P. maydis; however, only P. maydis has been found in the United States.

Tar spot, a foliar disease of corn caused by the fungal pathogen, Phyllachora maydis, was reported and confirmed for the first time in Maryland. County PA in 2020 and has since spread to several neighboring counties. It was first detected in the United States in Illinois and Indiana in 2015 and has rapidly spread throughout the Corn Belt. The sample collected from a Harford County farm on August 19 is the first confirmed case in Maryland.

Tar spot in corn, Tar spot is a foliar disease of corn caused by the fungus Phyllachora maydis. This disease has the potential to significantly impact yield.

Tar spot is a new foliar fungal disease of corn first discovered in the United States in 2015 and confirmed in Maryland in 2022 and was estimated to be the most significant yield-limiting disease of corn in the US in 2021 and 2022. As a new disease for our state, this project collected preliminary data on the distribution of tar spot in our state and compared the efficacy of different fungicide application timings.

Tar spot is a disease of corn caused by the fungus Phyllachora maydis.

Agronomy Newsletter -June 2024, Volume 15, Issue 3. Topics include: State Court of Appeals Overturns Circuit Court’s Right-to-Farm Decision, Thoughts on Tar Spot Management, Scouting for Fusarium Head Blight, Paraquat Training Opportunities, June IPM Insect Scouting Tips, UMD Faculty Member Partners Nationally to Release Highly Anticipated Decision Aid Tool to Produce Maximum Crop Yield, New Forage Enterprise Budgets, Fungicide Efficacy Tables for Corn and Soybean, Weather Outlook, and Maryland Regional Crop Reports.

Agronomy News is a statewide newsletter for farmers, consultants, researchers, and educators interested in grain and row crop forage production systems. The topics for this edition are

With corn harvest underway across the state, growers may be encountering ear rots and stalk rots in affected fields. The degree of severity is dependent on a variety of factors, so it is wise to scout fields prior to harvesting in order to identify problematic fields and give those harvest priority.