I am pleased to present you with WCM Issue 16 of June 26, 2008.

• Soybean Aphid update
  Soybean aphids made their debut in early vegetative soybeans in Wisconsin over the last two weeks. Reports in this article are from V2 to V4 soybeans. Populations are not of economic concern at this time. Weekly soybean aphid scouting should begin by late vegetative soybean growth stage and before early reproductive stage (beginning bloom). It is a good idea to monitor soybean fields for arrival of soybean aphid and colonization in your fields while checking soybean stands.
• UW-Extension/Madison Plant Disease Diagnostic Clinic (PDDC) Update
  The PDDC receives samples of many plant samples from around the state.
  The following diseases/disorders have been identified at the PDDC since June 18, 2008:
• Wheat Head Scab Beginning to Occur in Wisconsin
  Wheat head scab (synonym, wheat head blight), caused by several species of Fusarium, but in the U.S., mainly Fusarium graminearum, was noted in a routine survey of the winter wheat variety trials during the week of June 16th (Figure 1). This was not an unexpected discovery given the recent weather conditions during the flowering period.
• European Corn Borer update
  Degree Day accumulations suggest the southern ½ of Wisconsin is at, or just past peak European corn borer flight and the most opportune treatment timing (if needed) may be starting in southern Wisconsin.
  Spot-check earliest planted corn because it is more attractive to female first generation European corn borer moths to lay eggs.

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