Today's Date: 2020-05-26

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Leaf Rust 

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Plant Pathologist Commentary: Small Grains Disease Update 07/26/2019

This will likely be the last small grains disease update for the 2019 cropping season. If you have not already done so, I encourage you to really evaluate the extent of the FHB infections in your fields. This is an important first step to not become aware of the extent of the damages but also to start developing a plan of attack to minimize the impact of these FHB infections on the grain and possibly the straw you will market.

Your first step is to maintain quality and avoid the potential discounts due to low test weight, fusarium damaged kernels and the presence of DON is to segregate the worst affected fields or areas of fields and not co-mingle the grain. Your second step is to increase the fan speed during harvest to reduce the number of fusarium damaged kernels in the grain tank. Unfortunately, you will also increase your harvest losses as you increase your fan speed as smaller but otherwise sound kernels will also be left in the field. Often these smaller kernels come from the spikelets above the initial point of infection and where the FHB has grown into to rachis, thereby halting the grain fill of the kernels higher on the rachis.

If needed, the next step is to use a grain cleaner to further reduce the number of fusarium damaged kernels. A Kwik-Kleen grain cleaner or equivalent allows you to clean the grain prior to putting the grain in storage.

Good luck and stay safe with harvest!

Important Note Important Note: Please review Terms of Use before utilizing this site. The leaf disease models available on this website are courtesy of NDSU. Infection happens when an infectious pathogen contacts a susceptible plant in a suitable environment. To find out if the previous day contained an infection period, the models use hourly high-resolution weather data provided by Iteris, Inc. The leaf disease forecaster is intended to be used in steps, which are described here, that work together to maximize your potential economic return by protecting the health of the top two leaves. It is important to note that in order for the forecasting model to work as intended, the disease-causing agent must be present, which requires field scouting as described here.