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Published on Wednesday, July 13, 2016
July is a critical month for corn and soybeans as both are going through critical reproductive growth stages. It is also a very important time to scout fields for diseases and insects. In 2015, Northern Corn Leaf Blight was very common in many areas, along with Gray Leaf Spot in others. Both of these diseases overwinter in corn residue so the inoculum is there for development this year if weather conditions are conducive, especially in corn after corn. It will be important to keep an eye out for development of diseases just prior to tassel and beyond to ensure that spraying is done in a timely manner if needed.
Another yield robbing pest to look for between July and harvest is soybean cyst nematode (SCN) populations. They are often overlooked with the wide-scale adoption of resistant varieties. If there are fields that just do not to seem to yield as well as they once did, they might be good candidates to take some soil samples to see what kind of SCN levels are present. If SCN levels have increased or levels are high, it may be time to take soybeans out of the crop rotation or switch to the Peking source of cyst resistance to try to reduce cyst numbers.
Author: Pat Holloway
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