Today's Date: 2018-12-14

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Tan Spot 

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Plant Pathologist Commentary: Small Grains Disease Update 07/03/2018

Conditions around the state are challenging with many areas having received high amounts of rainfall and continuing to received rain fall through thunderstorm events.

The rainfall and warm temperatures are creating the humidity idea for fungal diseases. In addition to these conditions, hail damage experienced in some areas is also providing ideal conditions for Bacterial leaf streak to take hold.These conditions are also making it difficult to get fungicide applications on to crops in a timely fashion.

What's Out There? With much of the crop headed and even flowered, one of the main concerns is FHB development. FHB has been observed in winter wheat plots in southern part of the state with early awn infections present in commercial fields in the Northwest. Risk models are trending high to moderate risk for both susceptible and moderately resistant varieties in the southern half of the state and for large areas in the north central part of the state. The optimal time to make applications for disease and DON control is early flowering, Feekes 10.5.1, when yellow anthers first appear in the middle of the wheat head. Application should be made when the majority of spikes in the field have reached this stage. Primary spikes can be used as an early guide as the tillers will be 3-4 days behind in development. In areas where early flowering has been missed due to conditions, later applications can be made to achieve some efficacy. Its is essential when thinking about making later applications to check the pre-harvest interval restrictions on labels and to not exceed these.Always follow label instructions.

other Diseases.

With current conditions, Bacterial leaf streak may be observed in fields. There are no methods of control at present other than using less susceptible varieties in future years. Consult the MN and ND variety trials guides to establish which varieties will work best in your area.Bacterial leaf streak can look like other fungal disease such as Septoria, when the lesions become advanced as they look brown and necrotic. It is therefore important to ensure accurate identification.

Septoria may well be observed in fields this year, remember that any application made to control FHB at this time should help control and most of the late season diseases such as Septoria spot blotch and tan spot,so no additional spraying should be required to control these disease in addition to spraying for FHB.

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 Meridian Environmental Technology. 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.