Latin name: Amphorophora agathonica
Reason for Concern:
1) In cool, wet conditions aphid populations can become a significant harvest contaminant and decrease plant vigor.
2) They can also vector virus diseases (such as Raspberry Mosaic Virus).
3) Honeydew exudates can make leaves and fruit sticky and provide a nutrition source for sooty mold fungi (not harmful to the plant, but it can make the fruit unsuitable for sale).
Found in colonies on new shoot growth, buds, undersides of leaves, and near flower and fruit clusters; about 1-3 mm long, soft-bodied, and pear-shaped; can be green, yellow, pink, white, bronze, dark-brown or black colored. Adults may be winged or wingless. Immature stages resemble small wingless adults.
Aphids overwinter as eggs on host plants, which hatch in May. Eggs hatch into "stem" mothers, who bear live young; these live young, in turn, bear more live young. Nymphs feed on blossoms, growing shoots and leaves. Young aphids mature to be winged or wingless females, giving birth during the summer. Each mature aphid can produce 50-100 offspring. They can reproduce either sexually or asexually The winged form can fly great distances, while the wingless form remains and develops on brambles where it was born. Males are produced only in fall. Males mate with females, which lay overwintering eggs. The development time and number of generations produced depend on host and weather conditions. 15 to 30 generations may produce per season.
- Start in early May. Look for aphids, aphid mummies (parasitized aphids), and aphid predators weekly. Sample a minimum of 4 sites, 40 leaflets total.
- Adjust frequency of sampling dependent on weather, population dynamics, population life cycle, and predator population.
- Check for clusters on undersides of new growth, stems, buds, or among the veins of leaves.
- Check for their potential to be a harvest contaminant just before harvest begins.
- During harvest, use information from the fruit to drive treatment decision (ex. fruit with sooty mold fungi).
- They can vector Raspberry Mosaic Virus. But this virus is not a major problem in the Northwest.