Spotted Wing Drosophila IPM Weekly Scouting Reports

spotted wing drosophila on blackberry

By monitoring spotted wing drosophila populations on NH farms, and making the results of that monitoring available to growers each week, UNH Cooperative Extension helps growers implement IPM plans, reduce pesticide use, and produce quality crops.

Our first SWD traps are placed in strawberry fields in early summer at the first sign of the fruit developing color. Traps are added to new berry crops throughout the season as each crop shows the first sign of ripening. Traps remain in the crop through harvest.

In addition to traps located within the crops, at each monitored farm, one or two traps are placed outside of the crop area, at the edge of the woods or in another area of natural vegetation. These traps are used to monitor the natural dynamics of the SWD population at that location.

Scouting results are posted here weekly so that growers can easily monitor pest levels at farms near to them and can make management decisions based, in part, on these numbers.  Trap counts are one indicator that goes into making management decisions. Trap counts should be considered in combination with factors such as weather and crop stage. Cultural practices which improve airflow and sunlight and spray penetration will aid in reducing SWD population build up.

Trapping at your own farm is the best way of knowing what is happening in your crop and will help you make the most effective management decisions.

Visit our SWD page to learn more about spotted wing drosophila (SWD) biology and management.

Research into the population dynamics of this new pest is underway across the region. While threshold values have not been set for this pest, by knowing if SWD is in a given crop, you can make informed decisions about how seriously you should consider taking management actions in that crop. Management in high value crops is most impactful when fruit is RIPENING.

Watch this page for alerts of population spikes 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’s IPM grant program.