Behind the 11th green, we installed a linear trap designed to catch annual bluegrass weevils as they make their way from their over wintering areas in the adjacent woods, to the green where they will lay eggs. When the eggs hatch, the larvae feed on the poa annua, weakening it to the point that it dies.
With the trap, we know when these insects begin to move, and get a rough idea of the initial population that we are dealing with. With this info, we time and manage our sprays to suppress the population of adults prior to egg laying.
Managing these weevils is a year long battle - they can have four or more generations a year. They attack poa anywhere too- greens, tees, fairways and rough. They are also resistant to many of the available treatments. For the best control, timing and rotation of different type insecticides is best.
There are many types of insects that attack turf, yet the annual bluegrass weevil is by far is the most challenging.
Pictured below is the linear trap, Edgar preparing the area for installation, and Denia flagging it.
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