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: May 2021

It is time!

All of the phenological indicators are pointing at full bloom Rhododendron as a great tool for targeting larvae before damage occurs. Throughout the Mid-Atlantic and the New York City metro region, we are finding ABW larvae that are already large enough to cause damage or that will start to cause damage.

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ABW larvae development

So far, the 2021 annual bluegrass weevil season has been very close to “normal” at most of our sites compared to more than 10 years of WeevilTrak records. This is the ideal time to make late larvicide applications targeting larvae that are coming out of the stem and starting to feed on crowns.

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Larval activity in some areas!

We're seeing some larval activity at WeevilTrak sites in North Carolina.

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Time for larvicides vs mid-size larvae in central and northern New Jersey

In central and northern New Jersey, the annual bluegrass weevil (ABW) populations are moving along with larvae now present up to the 4th stage, exceptionally even 5th stage.

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Its finally heating up!

Annual bluegrass weevil activity from Ohio to central Pennsylvania has been relatively low this spring, but adults have been active and early instar larval populations are beginning to peak at most locations.

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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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