Currently, the main pests affecting seedlings are Euonymus japonicus, Cyperus bungeanus, and Hymenoptera. These pests have already made their appearance early in the season, with large infestations observed in the first generation. Due to the irregular timing of their occurrence, the level of infestation varies, resulting in a significant number of remaining pests. The first generation of adult pests has now emerged, and the moth population is reaching its peak. It is expected that the second generation will pose a serious threat to flowers and nursery stock. Therefore, it's crucial to conduct timely inspections and implement control measures across all areas.
Trend Analysis:
1. Euonymus japonicus, commonly known as "silk wood Venus feet," has larvae that are black with white vertical stripes and white horizontal lines at both ends. This pest primarily affects species such as Euonymus japonicus, Euonymus spp., Eucalyptus spp., silk cottonwood, Poria, Populus, and willows. According to local station observations, the first generation of this pest had a high population density, long duration, and irregular occurrence. The second generation of larvae is expected to begin around July 30th.
2. Boxwood wilderness (likely referring to Boxwood leaf miner or similar). The larvae have dark brown heads, green bodies with dark green backs, and yellow-green vertical lines. They mainly attack boxwood, Buxus chinensis, and other related plants. The larvae feed on leaves, and the second generation is entering its peak period by late July.
3. Thorn moth includes several species, such as the yellow thorn moth, green thorn moth, and brown thorn moth. The larvae are covered in spiny, irritating hairs, often referred to as "spicy hair." These pests can damage a wide range of plants, including peaches, plums, apricots, pomegranates, poplars, willows, tea, camellia, black peony, maple, eucalyptus, and more. This year, the first generation of larvae appeared early and in large numbers. The second generation reached its peak around July 25, and the larval stage is expected to continue until early August.
Prevention and Control Recommendations:
1. Timing for treatment: The first round of treatment should be conducted from July 30th to August 5th, targeting large-leaved species like Cyclophora ulmoides and Cyclovirobufo gargarizans. The second treatment for moths is recommended between August 10th and 15th.
2. Pesticide options: Use 40% Deltamethrin (48% Fenitrothion) diluted at 800 times, 35% Chlorpyrifos at 800 times, 20% Emamectin benzoate at 800 times, or 25% Imidacloprid at 1000 times. If the control window is missed, 40% Chlorpyrifos can be applied at 600 times for severe infestations.
Notes:
1. Spraying should be done during early morning or late evening when temperatures are cooler and pests are more active.
2. Target young larvae for maximum effectiveness, as they are more susceptible to insecticides.
3. Be cautious when using certain pesticides near sensitive plants such as roses and willows, as they may cause phytotoxicity.
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