Diseases
Last week, the scouts continued to find a few fields with tanspot at low incidence and severity. Since last Thursday, widespread rains across much of Minnesota have allowed for much longer leaf wetness periods. Only the Red River Valley north of Hwy 200 continues to miss out on any measurable amounts of rain. Consequently, the conditions for small grain diseases, including FHB, to develop are much more favorable for most. This means that, compared to a week ago, the disease management/fungicide recommendations are changing. For oats and barley that will be reaching Feekes 10.5 (or fully headed), switch to a fungicide labeled for the suppression of FHB, as the risk forecast for the remainder of the week remains moderate to high across all but the NW and SW corners of the state. Likewise, apply a fungicide labeled for the suppression of FHB in wheat when the crop reaches Feekes 10.51 (or beginning of anthesis). Choose one of the premium fungicide products when your variety has a FHB rating of susceptible to very susceptible (>6 or higher)
Insects
Aphids continue to be found across Minnesota. The numbers to date have been low, with no fields reaching the economic threshold. The scouts also found a cereal leaf beetle (CLB) larva in Norman County. The economic threshold for CLB is 3 larvae per plant before the boot stage and 1 larva per flag leaf once the crop reaches the boot stage.
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