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| Powdery olive-green fungal spores are characteristic of Aspergillus ear rot |
As many of you have already heard, 2012 heat and drought conditions in our local corn crop have led to the on-set of Aspergillus ear rot and associated aflatoxins concerns for the local livestock industry. Lab tests for the mold locally have detected low levels in most samples, with mold levels expected to rapidly increase with recent rain activity in the area. Local mills and grain buyers will also be utilizing UV or “black lights” at most facilities to quickly detect to possibility of the mold in delivered corn, with some loads possibly to be diverted or stored separately at their facilities.
Recommendations are for local corn producers to harvest the crop as soon as possible at higher moistures before the mold has a chance to become well established, and then dry down the grain well below 15% (recommended 12-13%, depending on source). Drying will reduce the opportunity for additional aflatoxins to be produced, although this will not reduce current levels.
For silage production, aflatoxins will usually remain at the levels found in the corn at time of ensilaging if the process is done correctly at the right moisture, in air-tight conditions, correctly compacted, etc.. Where corn is not correctly made into silage (too dry or too much air around chopped corn), the mold may continue to develop and raise aflatoxin levels as fermentation is slowed or fails.
Testing can be done through the Purdue Heeke ADDL lab at the Southern Indiana Purdue Ag. Center near Dubois, IN, or through numerous testing labs available through your local feed mills.
A recent AgAnswers news article addresses the topic in more detail and and additional information on the mold, testing and preventative measures can also be found in Purdue Extension Publication BP-83.
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