What are the control methods for goji aphids?

Goji aphids, also called green honey aphids or honey bugs, belong to the family Aphididae. They cluster on tender shoots, flower buds, green fruit and other parts, sucking sap; infested shoots curl and shrink, and growth stalls. In severe cases, the surface of goji leaves, flowers and fruit is entirely covered by aphid secretions, affecting photosynthesis, causing early defoliation and resulting in heavy yield losses.

Goji aphids produce about 15 generations a year, overwintering as eggs in branch crevices and bud axils; the following year in late April they hatch into stem mothers, reproducing by parthenogenesis and viviparity, and winged aphids appear in the second and third generations, reproducing and spreading in the field. Aphid density is greatest from mid-May to mid-July, with June being the peak damage period. In mid-to-late July the population declines slightly, in August it is at its lowest, and in September it rises again, damaging autumn shoots; in early October sexual aphids appear, mate and lay eggs, with mid-October being the peak egg-laying period and early November the end. During the damage period the daily average temperature is between 18-28°C; the higher the temperature and the less rainfall, the faster the aphid numbers increase.

In the early growth stage, spraying with 3% carbofuran diluted 2000 times, 24% methomyl water agent 1000-1500 times, or 40% omethoate 1000 times plus 5% fenvalerate 5000 times can all achieve control.