Lavender Common Diseases and Pests
Lavender, as a representative aromatic therapeutic plant, often causes headaches for growers due to its disease and pest problems. When the purple flower spikes are affected by disease spots spreading or attacks from red spiders, it not only affects the ornamental value but also threatens the survival of the plants. This article systematically analyzes four typical diseases and provides professional control solutions.
Three Disease Diagnosis Techniques
Leaf Spot Disease Identification and Management
Brown sunken spots on seedling leaves are typical symptoms, while mature plants show radial withering from the inside out. It is recommended to spray a 1:100 Bordeaux mixture early in the morning, combined with twice-weekly foliar sprays of zinc omethoate for three weeks to effectively prevent the spread of the pathogen.
Root Rot Disease Prevention Points
Soil moisture sensors are key to prevention, and watering should be paused when the substrate moisture exceeds 60%. In the early stages of the disease, use a 500-fold solution of methyl thiophanate to water the roots, and in severe cases, replace the breathable perlite mixed substrate completely, pruning the rotting roots and soaking in a fungicide solution for 30 minutes.
Complete Guide to Pest Control
War on Red Spider Mites
This mite is characterized by webbing on the back of leaves, and a combination of avermectin and etoxazole can be used, focusing on the middle and lower parts of the plant. It is recommended to combine this with hanging yellow sticky traps and physical rinsing of the foliage weekly to enhance eradication efficiency.
Comprehensive Control of Leafhoppers
In addition to using phoxim emulsion, planting pest-repellent plants such as mint and rosemary around the garden can be effective. Turn on frequency vibration pest-killing lights at night, set at a height of 1.2 meters above the plant tops for best results. During winter cleaning, thoroughly remove surrounding weeds to destroy their overwintering environment.
Preventive Maintenance System
Establish a pest and disease early warning system, using a sugar-acid solution (brown sugar:vinegar:water = 1:3:10) to monitor pest density monthly. Maintain a plant spacing of 30cm or more, and regularly prune dense branches to enhance ventilation. It is recommended to have a crop rotation period of no less than 3 years, with preference for grass family plants as the previous crop.
By accurately identifying disease characteristics, combining biological and chemical methods, and improving cultivation practices, the disease and pest resistance of lavender can be significantly enhanced. It is recommended that growers keep a maintenance log, recording the time and dosage of each application, gradually forming a personalized control plan.