Here’s the latest issue of the Wisconsin Crop Manager.

• Hill Mustard, an invasive mustard on the move in Southwestern Wisconsin
  A new invasive mustard called Hill mustard has recently been observed spreading throughout the southern part of the state.
• Bean Leaf Beetles are Active, Scout Emerging Soybeans
  Bean leaf beetles have begun to emerge in the region. Bean leaf beetles overwinter as adults beneath leaf litter. In early spring, adults feed on cultivated (alfalfa) and wild (e.g. showy tick trefoil) legumes. As soybean seedlings emerge, beetles move into soybean fields to continue feeding and lay eggs.
• “Labelled Stages for Postemergence Herbicides in Corn ":http://ipcm.wisc.edu/WCMNews/tabid/53/EntryID/277/Default.aspx
  In regards to postemergence herbicides in corn, I think these three simple rules capture most of what needs to be said.
• The decision to irrigate – Irrigation Economics
  Given that some regions of Wisconsin (notably northern) have not received adequate rainfall thus far, questions on irrigation may arise. Included below are some helpful references for you and/or your clients to consult when considering the purchase of irrigation equipment.
• Early-Season Weeds in Corn
  Postemergence herbicide programs in corn should make growers and agronomists think hard about the question of “When does weed competition start to affect corn yield potential?” A few bushels lost to weed competition can easily result in a $10/a or $15/a loss or more.
• Frost Impact on Corn at Early Growth Stages
  Over the last couple of nights (May 17 and 18) a light frost hit much of Wisconsin. Farmers are reporting frost damage to corn and other crops over widespread areas in northern Wisconsin and scattered low spots further south.
• Frost Damage and Crop Insurance Replant Provisions for Wisconsin Farmers
  Farmers have reported frost damage to corn and other crops in Wisconsin. Farmers who bought federal crop insurance coverage such as actual production history (APH) or crop revenue coverage (CRC) have replant coverage as part of their policy (unless they bought catastrophic coverage only). This short bulletin overviews this replant coverage, focusing on corn and soybeans.