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After a quiet late June and early July, ABW larvae have shown up in full force in mid-to-late July 2021.
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It has continued to be a relatively quiet annual bluegrass weevil (ABW) summer. But I received several calls earlier in the month from superintendents who suspected that they had some breakthroughs on tees and collars. It's critical at this time of the year to determine whether chlorosis or the early onset of a potential problem is due to insect feeding or something else.
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.
In central and northern New Jersey, it is time to scout for and, if necessary, treat against the adults of the annual bluegrass weevil spring generation provided the population is still susceptible to any of the adulticides.
It has been some time since my last blog, which usually means lots of things have been happening in the lab and field. Although our lab has been extremely busy with research and evaluating insecticide trials, it has been extremely quiet as far as ABW activity.
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.
ABW has been and will likely continue to be one of the most intractable insect pests of fine turfgrass throughout the Mid-Atlantic and Northeast regions. Sometimes, I see breakthrough with a well-timed application regime with the proper insecticides. In this blog, I will try to explain the reasons why I feel we see isolated outbreaks in golf course turf.
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.
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.
We're seeing some larval activity at WeevilTrak sites in North Carolina.
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