NDSU Extension Service - Williams County

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June 25, 2015

Wheat

Deciding what fungicide to use and when to apply it is something a lot of farmers are asking, after last year’s late rain many peoples crops encountered disease. Right now is the time to start thing about applying fungicide for scab suppression, the growth stage of the wheat will have a huge impact of the reaction. Do not use fungicides that are in the strobilurin chemistry class as they do not provide scab suppression and in some cases have shown to elevate DON (vomitoxin) levels. The recommended class of fungicides are trizoles (ie: Caramba, Prosaro, Folicur and tebuconazole generics). Remember that fungicides are labeled for scab suppression and will not provide 100% control, using an integrated approach is the best with good crop rotation practices and properly timed fungicide applications.

The best time to apply fungicides is at the early flowering stage, the period between head emergence and flowering is usually three days. Determining when to spray is a challenge since not all of the plants will flower at the same time. It is best to apply when most of the main stem and first tiller spikes have reaches early flowering. This information was from NDSU Crop & Pest Report, this article was written by Andrew Friskop and Joel Ransom

Rust Fungi

With the wet weather we had a few weeks ago, along with some of the humid days we have been having that could all lead up to an rust outbreak. Orange, jelly-like galls on junipers are spewing rust all over apples, crabapples and hawthorns. The spores that are released penetrate the leaves, causing the orange spots. Once there is an infection, there is not much we can do and not much to worry about. Established plants can tolerate rust disease, but several years of infection can weaken the trees making them susceptible to other diseases. The rust fungi thrives under wet, humid conditions, we can reduce conditions next spring by pruning plants to maximize light and air flow. Preventative fungicides can be sprayed on susceptible trees next spring, spraying when flower buds first show color. Following with applications every 7 to 10 days will help protect the plants, using Chlorothalonil (Daconil, Bravo) mancozeb (Dithane) copper and sulfur are used.

In the spring removing the orange galls on nearby junipers can be done, but unfortunately the sports can spread for miles, making it impossible to prevent rust exposure. This information was from the NDSU Yard & Garden Report.

 

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