Control methods for stem-boring pests damaging cherry blossoms

The stem-boring pests that damage cherry blossoms include longhorn beetles and the coffee wood moth (Zeuzera coffeeae). Their control methods are:

1. Longhorn beetles. The longhorn beetles that damage cherry blossoms usually include the citrus longhorn beetle (Anoplophora chinensis), the glossy green longhorn beetle (Anoplophora glabripennis), and the peach red-necked longhorn beetle (Aromia bungii), etc.

① Citrus longhorn beetle. One generation occurs per year. When adults emerge from late May to early June, capture the adults: before laying eggs, the citrus longhorn beetle adult first bites a notch about 2 mm deep and about 8 mm long in the bark in the shape of the Chinese character "eight" or "ding", then lays eggs inside it. During the peak egg-laying period in mid-to-late July, search for the notches on the trunk and crush the eggs. During the stage when newly hatched larvae are active in the cortex, use a grafting knife to pick the larvae out. For larvae that have bored into the xylem, use a steel wire hook to hook them out; alternatively, use a grafting knife to first clean away the frass and wood shavings, then use a plastic oil sprayer to inject a 50% fenitrothion 1:50 solution or fruit tree treasure infusion liquid, and finally seal the bore hole tightly with wet mud.

② Glossy green longhorn beetle. One generation occurs per year. For control, use manual capture and chemical control, with the same methods as for the citrus longhorn beetle.

③ Peach red-necked longhorn beetle. One generation occurs every 2 years. The peach red-necked longhorn beetle often mates and lays eggs from the canopy to the base of the trunk on sunny days from 12:00 to 13:00, so capture can be carried out after the adults appear in mid-June. The bore dust and excrement of the peach red-necked longhorn beetle are reddish-brown. When very fine reddish-brown frass is found, use a small knife to cut open the cortex and kill the newly hatched larvae.

2. Coffee wood moth (Zeuzera coffeeae). One generation occurs per year. Because the adults are phototactic, blacklight lamps can be used to trap and kill them during the emergence period. For bored branches showing wilting, promptly prune them off, and split them open to kill the insects or burn them. Alternatively, spray a 1000-fold solution of nicotine and matrine, or a 20% mezhuling (chlorpyrifos) emulsion at 50-200 fold dilution to kill them.