Disease and Pest Control of Fraxinus
As an important species for urban greening, Fraxinus is often threatened by diseases and pests, which affect its growth and survival. This article provides an in-depth analysis of two typical diseases and pests of Fraxinus, offering a systematic solution including the control of gummosis and the elimination of narrow-necked beetles to help you protect the health of the trees.
Common Types of Diseases and Pests in Fraxinus
Key Points for Gummosis Control
Gummosis often occurs in the early spring during the revival period, with the presence of gum-like secretions on the trunk being a typical symptom. Field observations have shown that the disease mainly forms in relation to three aspects: tissue damage caused by freezing injury, stress reactions caused by strong sunlight burns, and wound infections caused by boring insects.
Control should adopt a three-level response mechanism: 1. Preventive stage: Increase application of phosphorus and potassium fertilizers in autumn to enhance cold resistance, and cover the root zone with film for insulation. 2. Early onset stage: Apply a 500-fold solution of 75% carbendazim wettable powder + 3% zhongshengmycin to the lesions. 3. Severe case treatment: After scraping the necrotic tissue, apply Bordeaux mixture + carbendazim compound preparation to seal the wound.
Narrow-necked Beetle Pest Management
The narrow-necked beetle has 3-4 generations per year in the northern regions, with larvae boring into the phloem to form spiral galleries. Three-year field trials have shown that the period from April to June, when adults emerge, is a key window for control.
Recommended phased management plan: • Overwintering stage: Implement trunk whitewashing (lime:sulfur:water = 5:1.5:20) from December to February of the following year. • Emergence stage: Hang sex pheromone traps and spray with a 2000-fold solution of 3% lambda-cyhalothrin microcapsule suspension. • Larval stage: Use a new root irrigation preparation - 22% thiamethoxam · lambda-cyhalothrin suspension for soil treatment.
Building a Comprehensive Protection System
Establish a disease and pest early warning and monitoring system: Conduct monthly tree vigor assessments, focusing on vulnerable areas such as the crotch of the trunk and the root distribution area. It is recommended to use digital monitoring equipment to record key parameters such as temperature and humidity, and the population of pests, to achieve precise prevention and control.
Ecological regulation measures: Interplanting repellent plants such as mint and rosemary in the forest, and setting up nectar plant strips to attract beneficial insects. This method has been proven to reduce the incidence of narrow-necked beetles by 42%-65%.
By adopting a strategy system of "prevention first, comprehensive management," combining physical control, biological regulation, and chemical intervention, the incidence of diseases and pests in Fraxinus can be effectively controlled. Regularly conducting tree health checks and establishing a disease and pest control file are key measures to ensure the sustainable development of园林 trees.