SWD Update – Continued trap captures | NY Berry Pest Monitoring Network

red background with 30 or more flies stuck to surface. in center one fly has spots on wings. — SWD male on red sticky card. Can you find it?

Spotted wing drosophila (SWD) trap captures continue to be reported in many locations throughout NY state over the past few weeks. In many places, trap counts continue to be low. In some locations populations have escalated quickly.

First captures were reported:

The week of 5/27 in Albany, Dutchess and Suffolk Counties.
The week of 6/3 in Clinton, Columbia, Schuyler, Washington, and Ontario Counties.
The week of 6/10 in Delaware, Essex, Niagara, Tioga, Tompkins, Wayne
The week of 6/17 in Chenango
The week of 6/24 in Monroe

SWD Sticky card trap with lure in raspberries.

In most locations, sustained trap capture was reported the following week (sustained – two consecutive weeks of positive trap captures). Traps are taken down in some locations after 2 or 3 consecutive weeks of captures. In other locations they are used by growers to estimate pest pressure over the course of the season. While there is currently no data-driven recommendations on thresholds to guide pesticide applications, work is being done to test this at labs across the country, including Dr. Greg Loeb’s lab at Cornell AgriTech in Geneva.

As mentioned our first update for 2024 summarizing SWD monitoring, first captures are somewhat earlier than has been reported in the past. This is especially true compared to last season (2023), in which first trap captures for many locations were recorded nearly two weeks later than average. This highlights the need for site and season specific monitoring efforts to initiate management programs at the appropriate time.

Cumulative SWD Trap Captures at Monitoring Locations in NY State

Under the correct conditions, populations of SWD can increase rapidly. First and sustained trap capture has been reported in the majority of monitoring locations at this time, although in some locations SWD has not yet been detected in traps. In most places, numbers are low and slowly increasing. But in some locations populations have increased dramatically. In other locations, populations have declined, likely suppressed by insecticide applications. The following graph shows at sites across NY State from the week of May 27 to June 24, showing increase in the overall number of insects captured per site.

A map of NY with red circles in various darkness and diameter across the state. Largest circles in the Hudson Valley. Graph above displays a line graph of count over time, with increasing numbers from May 27 to June 24. — Map of spotted wing drosophila trap captures at monitoring locations across the state. Red circles correspond to the cumulative number of insects per site for 2024.

Weekly SWD trap captures by location across NY

Line graph of count over time including 29 locations, one line goes up very quickly to over 300, most other lines go up more slowly to less than 5. — SWD Trap captures at monitoring locations across NY from May 27 to June 28.

Weekly SWD trap captures by location across NY

Location	Week of 5/27	Week of 6/3	Week of 6/10	Week of 6/17	Week of 6/24
Albany1	10	9	5
Chenango1			0	1
Clinton1		4	5
Columbia2	0	9	5	16
Delaware1			23		30
Essex3		0	6	6
HV Fishkill – Dutchess6	2	21	77	452
HV Red Hook – Columbia3	0	2	9	57	83
LO1 – Niagara4	0	0	2	5	37
LO2 – Orleans2	0	0	1		0
Monroe1			0		2
Niagara6			0	2
Orleans4	0	0	0		6
Schuyler6	0	3	12
Suffolk1	4	3	95	11
Suffolk2			13	45
Tioga4		0	8	12
Tompkins4	0	0	1	2
Washington1		1	3	10
Washington2		2	9	18
Wayne11	0	0	1	0	1
Wayne13	0	0	0	2	29
WNY Geneva – Ontario6		5	15	7	4
Tioga5				7
Tioga10				9
Tioga6				3
Tioga7				5
Tioga8				6
Tioga9				10

Thank you to all of our collaborators for servicing SWD traps across the state!