However, there is no definitive time interval between when it is first seen in Georgia and when we first see it in South Carolina. It usually shows up in Georgia before we see it in South Carolina. Southern rust does not overwinter in South Carolina but overwinters in southern Louisiana and Texas. Southern Rust seems to be the foliar disease that most growers worry about on corn. Occurs approximately 10-14 days after silking. R2: Blister – Kernels have a blister like appearance, with clear liquid on the interior and an ivory exterior. R1: Silk-one or more silks become visible beyond the husk leaves VT: The entire tassel has emerged, regardless of whether it is shedding pollen. multiple active ingredients, tend to having longer efficacy than the 2 weeks normally associated with just one mode of action.Ī quick guide to midseason corn growth stages from tasseling to maturity: After R-3 the return on spraying normally goes down, especially for diseases such as Southern Rust.įungicides with multiple modes of action, i.e. ![]() The best results from a fungicide normally are obtained if the fungicide is applied between tasseling and R-3. Fields that have received excessive rainfall or had heavy morning dews during and immediately after tasseling.Fields that have been planted to corn for 2 or more consecutive years especially those in minimum tillage systems. ![]() Most hybrids have good resistance to our primary diseases such as Anthracnose leaf blight, Gray leaf spot, Northern Corn Leaf Blight, and Southern Corn Leaf Blight.ĭisease incidence and severity tend to be highest in fields with: Here are a few tips and questions to ask yourself to help you make this decision.įirst you need to check the information sheets on your hybrid. This is the growth stage where most growers will be deciding whether to spray a fungicide for foliar diseases. ![]() With extensive rains occurring across much of South Carolina in the last week our corn crop is getting back on track and more than half of it is in the process of tasseling.
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