Waldo, Lincoln, Knox counties
It is time to start looking at your plants for flower bud opening and for cups to start appearing this week if you have a mummy berry plot in these counties. After the unusual warm weather 2 weeks ago, the plants have moved along to just starting to open their bud scales on their flower buds. Plants in Appleton on Sunday were mostly at F1 stages (buds scales opening, see pictures below.
Mummy berry cups were not seen in Appleton on Sunday. I expect both plants to become susceptible and cups to start opening in these areas within the next week.
I have put out weather stations in fields in Appleton and Belfast, and growers are observing mummy berry plots in Appleton.If you have a mummy berry plot I would like to hear how your cups are developing.
Applications of fungicide are more cost-effective when 40% or more of the stems have susceptible flower buds.
To
determine the percentage of plants in a field that are susceptible
1) Collect 20 stems randomly in a
transect across the field
2) Count the number of stems that
have any flower buds at F2 stage (flower buds are easier to see than
leaf buds)
3) Multiple the number of stems with
susceptible buds by 5 (if you looked at 20 stems) to get the percentage of
susceptible stems in your field.
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