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. Olga Kostromytska

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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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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Time for the new summer ABW generations in Southern New England

The spring generation of annual bluegrass weevil (ABW) has completed its development and the adults of that generation are at the peak of their activity now. It is still possible to see some pupae and larvae in some locations, however the vast majority of ABW are adults now, mating and laying eggs.

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Annual bluegrass weevil season 2020: long period of adult activity and “express” larval development

Growing degree day (GDD) accumulation in Massachusetts and northern Connecticut had a quick start in early March and increased relatively rapidly up to mid –March, with a couple days in the high 60s, for most of our locations.

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Annual bluegrass weevil season 2020 is about to start in New England

In southern New England, the annual bluegrass weevil (ABW) season is just around a corner.

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Time to scout for and treat against mid-sized larvae in New England

This week's samples from most of our WeevilTrak sites have revealed a range of larval stages. What surprised us was that we are seeing about the same kind of larval activity for most of the locations, even though some sites have been much cooler throughout the spring and are therefore further behind on growing degree days.

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To spray or not to spray?

Several superintendents have been asking one or the other of us whether it is time to apply an adulticide for the annual bluegrass weevil. Remember that we normally recommend that application to be made between Forsythia “half green – half gold” and dogwood full bloom. In other words, the HGHG stage is really the earliest you should consider applying an adulticide. Of course, part of the challenge is figuring out which Forsythia plant you should “believe”.

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