We are collecting low to moderate numbers of aphids, both colonizing and non-colonizing, in our water pan and sticky card traps, with some pockets of high activity in both Aroostook and Central Maine. Black bean, Buckthorn, Foxglove and Potato aphids are the predominant species being collected, with some areas of high Buckthorn being found in Central Maine. Low numbers of Potato aphids and Green peach aphids have been found on potato plants within some fields.
We strongly urge all growers to be carefully monitoring aphid populations at this time. Growers should be aware that field scouting will not reveal the presence of non-colonizing aphids.
Please note that the aphid economic thresholds are for colonizing aphids only.
Colonizing Aphid Recommended Economic Thresholds
- Seed: 10% of plants with aphids, or 1 winged Green peach aphid
- Processing/Tablestock: 50% of plants with aphids, or 1 winged Green peach aphid