As the temperature rises in southern Iowa, farmers are advised to keep a close eye on the seedcorn maggot, a common pest that can cause significant economic losses if not managed properly.
The seedcorn maggot is a small, legless, white fly larva that feeds on germinating seeds or seedlings of corn and soybean. It is most active in cool, wet soils and is attracted to decaying organic matter.
Based on current growing degree days, the first generation of adult seedcorn maggots has likely emerged throughout much of southern Iowa. Therefore, farmers thinking about planting should track the growing degree days to reduce the risk of injury in high-risk fields. These include fields with a history of seedcorn maggot injury, recently tilled fields, and fields where organic matter was recently incorporated.
It is recommended to avoid planting during peak adult emergence, as the first-generation larvae typically emerge within a few days and feed for several weeks. Farmers should target planting during the "fly-free" period in areas at higher risk for seedcorn maggot.
To minimise the risks, farmers should adopt cultural and chemical methods before or during planting. Using seed treatments containing insecticides can help protect crops from infestation. However, it is important to note that no rescue treatments are available for seedcorn maggot injuries.
If infestation is suspected, farmers should monitor fields closely and check areas with stand loss for maggots, pupae, and damaged seeds. They should also keep an eye out for other seedling pests, such as wireworms or grubs.
By taking proactive steps to manage seedcorn maggot development, farmers in southern Iowa can protect their crops and maximise yields.
For more information about the seedcorn maggot, visit our sister site: https://www.farms.com/field-guide/pests/seedcorn-maggot.aspx
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Categories: Iowa, Crops