WeevilTrak Blog | GreenCast | Syngenta
Welcome to the WeevilTrak℠ blog, offering you updates about annual bluegrass weevil (ABW) from industry leading researchers. This blog will provide you with timely ABW activity across the north east as well as advice on scouting and controlling them using the Optimum Control Strategy.

Latest Posts: Dr. Tom Kuhar

Dwindling ABW populations in Blacksburg, Virginia – Signing off for the year

As we have seen dwindling adult numbers as well as no sign of new larvae as we head into late September, we will stop our WeevilTrak monitoring at this location in southwest Virginia.

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Very little ABW activity occurring in Blacksburg, Virginia – Mid August

There was a spike of new ABW adults in the first week of August at Blacksburg Country Club, but this apparently did not lead to any significant larval populations.

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Mostly adult activity occurring in Virginia – early July

As of July 1, 2021, we are seeing only moderate-to-low ABW densities and detecting mostly adults at Blacksburg Country Club, but reproduction is most certainly occurring.

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Large larvae and new adults occurring in Virginia – early June

As of June 10, 2021, WeevilTrak annual bluegrass weevil (ABW) monitoring in Blacksburg and Charlottesville, Virginia is indicating a flush of new adults crawling over greens. A peak in 4th and 5th instars is also occurring based on the soil plugs. Damage from these large larvae is evident in some spots around the golf course.

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New teneral ABW adults found in Blacksburg first week of May

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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High ABW larval densities in Blacksburg, Virginia trigger first larvicide application

Blacksburg Country Club owed a large burst of ABW larvae last week and larvicide applications were made at this course this week.

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First ABW larvae of the year found in Blacksburg, Virginia

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.

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ABW activity subsided with a cold week but sampling is advised with the warm week ahead in Virginia – Stage 1

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).

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Early and alarming ABW activity seen in Virginia – Stage 1

Growing degree days may not have accumulated that much in Virginia, but other indications are suggesting that a first spray application to target ABW adults may be necessary in Virginia.

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ABW tracking has commenced in Virginia – very little activity so far

As the week of March 6 has brought some warm weather to Virginia ABW have started to appear slowly.

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