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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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Over the past week, we have seen a flush of adult annual bluegrass weevil activity on greens and in soap flushes of fairways at all three WeevilTrak locations in Virginia.
Rhododendrons are in full bloom throughout the Mid-Atlantic region. This is a classic phenological indicator that larger (greater than third instar) larvae are active feeding and damage from annual bluegrass weevils will soon occur.
In central and northern New Jersey, the annual bluegrass weevil populations are moving along. Larvae are now present up to the fourth stage in central New Jersey and up to the third stage in northern New Jersey.
Western and central Pennsylvania have passed Stage 2 and are rapidly approaching Stage 3. This stage is a pretty critical one and timing can vary based on population development differences between courses within a region.
A brief update on ABW activity in Virginia for the week of May 9.
It has been a relatively slow start to the ABW 2019 season so far in North Carolina. Although ABW adults became active in mid-March throughout the state, numbers have continued to remain well below threshold, likely due to rainfall and cooler temperatures. Let’s compare where we are currently to this time last year to help predict when to make the first application.
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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