Spotted Wing Drosophila
Hosts: all fruits
Biology: Overwinter as adults and pupae, but it is unknown whether SWD can survive northern Utah winters. Adults lay eggs inside fruit and maggots feed on pulp.
Symptoms: Sunken fruit; holes in fruit.
Monitoring: SWD has been found in northern Utah in very low numbers, and in north-central Idaho in high numbers. Monitoring should be done using traps containing a cider vinegar or sugar-yeast bait. See the USU Spotted Wing Drosophila factsheet for more detailed information on monitoring techniques.
Treatment Threshold: None determined yet.
Degree Day Model:
- Lower threshold: 50F
- Upper threshold: 88F
- Start date: Jan 1
- Peak adult emergence: 755 DDs after Jan 1
Management Considerations: Monitoring will help to determine if this pest has been introduced to your area.