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Pulling turf plugs from the fairways at Blacksburg Country Club last week (May 5) revealed a reasonably high density of annual bluegrass weevil (ABW) larvae averaging around 40 to 50 per square foot (mix of small and large ones), and also produced our first teneral adult of the year. Has anyone found a teneral adult as early as May 5 before? We may have a record.
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Blacksburg Country Club owed a large burst of ABW larvae last week and larvicide applications were made at this course this week.
There was no clear peak of ABW adults in all of the sites I am watching for weevils along with my research sites. This made adult treatment difficult in some circumstances. But all of the WeevilTrak locations are in stage 1 or past and entering the time to begin larvae treatment.
We have added a new WeevilTrak site in the Columbus, Ohio area. The Golf Club in New Albany, Ohio is a late entry to the WeevilTrak season. This was added as adult activity and plant phenology would indicate that it is ahead of both Westfield Country Club in northeast Ohio and Pittsburgh.
After a period of fluctuating temperatures in the month of April in Virginia so far, the growing degree days have pretty much reached the threshold for peak annual bluegrass weevil adult activity throughout much of the state.
After a rather warm spring thus far, annual bluegrass weevil activity seems to have slowed down a bit with somewhat cooler weather more recently. But the optimal timing for adulticide applications is quickly approaching in central and northern New Jersey.
ABW activity and temperatures are heating up in North Carolina.
Growing degree days from northeast Ohio to central Pennsylvania have substantially increased in last seven days. Strange things are happening in terms of the accumulated GDDs relative to weevil movement and plant development.
Despite a cold week to end the month of March, which slowed down any adult annual bluegrass weevil (ABW) activity in Virginia, the growing degree days have now exceeded 100 GDD since March 1 throughout Virginia. I’m guessing that there will be a lot of adult activity this week (April 5).
All indications are that we will be off to an early start with annual bluegrass weevil activity this spring compared to 2020 season. This season we continue monitoring several sites in Southern New England that have been cooperators for several years now.
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