Euonymus japonicus, Cyperus bungeanus, and Hymenoptera are currently the main pests affecting seedlings. These pests have already begun to appear in large numbers during the first generation of the year, with a high population density and irregular occurrence patterns. As a result, their residual insect populations remain significant. The first generation of adult moths has emerged, with the peak of moth activity expected soon. It is anticipated that the second generation will pose a serious threat to flowers and nursery stock. Timely inspections and preventive measures should be carried out across all areas.
Trend Analysis:
1. Euonymus japonicus, commonly known as the silk wood Venus foot, is a major pest. The larvae are black with white vertical stripes and white horizontal bands at both ends. They primarily damage Euonymus japonicus, other Euonymus species, Eucalyptus, silk cottonwood, Poria, Populus, and willows. According to local monitoring stations, the first generation of this pest showed a large population and extended duration. The second generation of larvae began around July 30th, and their activity is expected to continue for some time.
2. Boxwood wilderness (likely referring to Buxus species) is another concern. The larvae have a dark brown head, thick green body, and dark green back with yellow-green vertical lines. They mainly attack boxwood, Buxus chinensis, and lobular boxwood by feeding on leaves. The second generation of larvae is entering its peak period around late July.
3. Thorn moth includes several species such as the yellow thorn moth, green thorn moth, and brown thorn moth. The larvae have spiky, poisonous hairs, often referred to as "spicy hair." These pests can affect a wide range of plants including peaches, plums, apricots, pomegranates, poplars, willows, tea, camellia, and more. This year’s first generation of larvae appeared early and in large numbers. The second generation reached its peak around July 25th, and the larval stage is expected to last until early August.
Prevention and Control Recommendations:
1. Timing for Treatment: The first treatment window is from July 30th to August 5th for large-leaved Cyclophragma ulmoides and Cyclovirobufo gargarizans. A second round of control for the moth is recommended between August 10th and 15th.
2. Recommended Pesticides: Use 40% chlorpyrifos (48% cypermethrin) diluted at 800 times, or 35% imidacloprid at 800 times, or 20% lufenuron at 800 times, or 25% lambda-cyhalothrin at 1000 times. If the control window is missed, 40% chlorpyrifos at 600 times may be used for heavy infestations.
Important Notes:
1. Spraying should be done in the early morning or late evening when the pests are most active.
2. Focus on young larvae for maximum effectiveness.
3. Be cautious when using poison products near sensitive plants such as roses and willows.
It is crucial to stay vigilant and follow these guidelines closely to prevent further damage and ensure the health of your nursery stock.
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