Doug Jardine with Diseases in Soybeans

(Doug Jardine) Hi, I’m Doug Jardine, and I’m the Extension Row Crops Pathologist, working in K-State Research and Extension. This week we’ve been out around the state running soybean meetings, and my part on the program, as you might guess, is that I’m from diseases in soybeans. This year there’s four areas that I’ve been trying to emphasize with the producers. The first is soybean cyst nematode. It is a very widespread disease in the state. Nationwide, it’s the number one cause of yield loss in soybeans. We’ve been reviewing with producers how they would go about managing it, the high risks for grains out there, but we know that we’re not all created equal, so we’ve been giving them some tips how they can combine rotation of the varieties, as well as the rotation of the crops to manage the nematode, but there are also some new nematicides out there that are applied as seed treatments, and so we’ve been talking to the growers a little bit about them, how effective they are, how they might be appropriate those into the management program. We’ve also been talking about seed treatments in general. Again, seed treatments are fungicides to control seedling diseases, as well as insecticides and nematicides, and then some growth regimens. Of course, I’ve been emphasizing the fungicide and the nematicide part of the seed treatment materials, we shared them with growers. Historically in Kansas what we use as seed treatment on a long-term route, is we can expect about a two and half push in yield increase. They in fact are a very good return on investment. We also talked about the fact that certain fungicides are very specific to the seedling diseases that they control, so that when they are looking for products, they need to use products that have two or three different modes of action in them so that they can get a broad perspective of disease control. Then we’ve been talking about sudden death syndrome, which is a disease that is relatively recent in Kansas. It dates back to the late 1990s, but every year it seems to increase in its severity. It associates with soybean cyst nematode, there’s a mutual arrangement between the two diseases. There is a new product out there that we’ve been discussing with them and wondering where they might use the product, also what they can do as far as grain selection to manage the disease. During the last part of the program, we’ve been talking about how to make a profitable fungicide application. A few years ago, when soybean prices went through the roof, there was a huge increase in promoting the fungicide application being used. Whether it was needed or not was sometimes the question. We’ve been reviewing with the growers when they should be interested in using a fungicide, which fungicides they might use, what diseases are most applicable for being controlled by a fungicide, and then when is the best time to put those products on. We finished off the discussion with at least one of the diseases and one mode of action of the products. We can get some fungicide resistance development, and so we just talked briefly about how they can manage the spray program to try and keep that from happening.

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