Squash Vine Borer IPM Weekly Scouting Reports

Squash vine borer trap

Squash vine borer is a destructive pest of squash and pumpkins.  The larvae (caterpillars) bore through squash and pumpkin vines and occasionally into the fruit of hard squash or pumpkins.

Through our squash vine borer monitoring and reporting program, UNH Cooperative Extension provides growers with current weekly data to help in making decisions about squash vine borer control. Our traps are put out in early June and are monitored weekly through early October. Traps, which are baited with a pheromone lure to attract male squash vine borer moths, are visited each week by an IPM Scout from UNH Cooperative Extension. Our scout  counts the number of male squash vine borer moths caught and enters that data here for use by NH farmers.

The table below gives a snapshot of the number of moths caught over the past week in monitoring traps across southern NH. The numbers presented here provide an indication to you of the population levels of squash vine borer at farms nearby, but be aware that conditions vary dramatically from one farm to another. Trapping at your own farm is the best way of knowing what is happening in your crop. Our factsheet, Managing Squash Vine Borer Problems in New Hampshire, provides instruction on how to set up and use your own monitoring traps.

Data from previous weeks is available through the drop down menu below the table.

The treatment threshold for bush-type squash and pumpkins is 5 male squash vine borer moths trapped, while the threshold for bush type plants is 12 male moths trapped.   If in one week, we trap 5 or more male squash vine borer moths in a bush-type squash or pumpkins at a given farm, or we trap 12 or more male squash vine borer moths in vining squash or pumpkin at a given farm, treatment is recommended at that farm.

For more detail on squash vine borer biology, monitoring, and control, refer to our factsheet, Managing Squash Vine Borer Problems in New Hampshire.

Watch this page for alerts of population spikes, occurrence of a second generation of squash vine borers, and other notable events that may affect your management decisions.

UNH Cooperative Extension’s crop insect monitoring programs are made possible through support from the NH Department of Agriculture, Markets and Food.

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Anna Boudreau
State Advisory Council Chair, Natural Resources Steward and NH Coverts Cooperator