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.

Archive: April 2021

Was there a peak of ABW adults this year?

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.

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WeevilTrak Update: April 18

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.

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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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The time for ABW adulticide applications is around the corner in central and northern New Jersey

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.

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Time to get going! ABW numbers are picking up at multiple sites…

ABW activity and temperatures are heating up in North Carolina.

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A Most Unusual Start

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.

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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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Annual bluegrass weevil season 2021 in Southern New England

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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2021 ABW Spring Season: Calm Before the Storm

As of Friday, April 2, things were getting a bit of a late start in North Carolina, especially compared to 2020, when a warm February resulted in early ABW adult activity and some early applications. This spring has been relatively cold with degree day accumulations between 1-3 weeks behind what we have observed in the past.

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