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Alfalfa Weevil in Second Crop Regrowth |
Wisconsin Crop Manager
Insects and Mites
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By WCM Staff on
5/29/2008 10:54 AM
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In the southern part of Wisconsin we have reached or exceeded 300 weevil degree days and damage reports have been on the quiet side. This could be a result of low weevil populations or a weather-friendly cutting schedule. If it was the latter, it might be worth some time to spot check fields for signs of damage to second crop regrowth.
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Spot Check for Early Season Armyworm Damage |
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Wisconsin Crop Manager
Insects and Mites
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By WCM Staff on
5/28/2008 3:52 PM
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Now isn’t the time we normally think about widespread armyworm damage in corn. However, it is the time when migrating moths are moving into the state and may cause damage to scattered seedling corn fields when/if field conditions are favorable. This spring migration is unpredictable in terms of incidence and severity.
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Prepare for Weeds in Corn |
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Wisconsin Crop Manager
Weeds
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By WCM Staff on
5/28/2008 3:05 PM
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Successful preemergence corn herbicide programs require two key components. First, the programs need dry weather (with limited wind) in order to have the preemergence herbicides applied. Second, the programs generally need 0.5 to 1 inch of rainfall to activate the herbicide after the application, which moves the herbicide from the soil surface into the zone where weeds are germinating.
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Corn Rootworm Egg Hatch Update for Wisconsin |
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Wisconsin Crop Manager
Insects and Mites
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By WCM Staff on
5/21/2008 5:08 PM
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With the relatively cool spring temperatures this year, insect development degree-days have been accumulating about 1-2 weeks slower than a typical spring. Corn planting is finishing up in Wisconsin, and growers and consultants will begin to ask about corn rootworm egg hatch and expected time frame of first through third larval instar corn rootworm feeding on corn roots.
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Cleaning Herbicides from Sprayers |
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Wisconsin Crop Manager
Weeds
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By WCM Staff on
5/21/2008 3:53 PM
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The potential for crop injury from herbicide contaminated sprayers is generally greatest with postemergence applications. Without proper clean out of sprayers, herbicide residues from one spray load can contaminate the next load and injury a sensitive crop. This is logical because the spray is making direct contact with the crops and is not being diluted with soil as with preemergence applications. Also, postemergence herbicides obviously have foliar activity, which may not be the case with all of the preemergence herbicides.
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Herbicides Kill Weeds – Why not the Crop? |
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Wisconsin Crop Manager
Weeds
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By WCM Staff on
5/15/2008 2:25 PM
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Why is it that crops are not harmed by herbicides? The simple explanation is that some plants are able to metabolize (or detoxify) the herbicide into non-toxic chemicals before they damage the plant. However, before the discussion continues about metabolism, a quick review about herbicide mode of action is justified.
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Print issue files for 2007
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Crop Manager Vegetable Update
Clicking on these links will access the Wisconsin Crop Manager PDF files for 2008.
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Clicking on these links will access the Wisconsin Vegetable Crop Update PDF files for 2007.
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