Diseases and Pests of Weeping crabapple and Their Control
As a popular species for courtyard landscaping, Weeping crabapple is beloved for its elegant, drooping branches. However, frequent diseases and pests during maintenance often lead to leaf drop and withered branches. This article systematically sorts out the characteristics of the five most common diseases and pests and provides scientific control methods to help growers respond accurately.
Complete Analysis of Disease Control for Weeping crabapple
Brown Spot Disease of crabapple: The Culprit of Leaf Drop
The disease can occur throughout the year, initially causing brown spots on the leaves, which develop into perforated lesions as the condition progresses. In high humidity, the pathogen's spores are spread through wind and rain, causing the entire plant to drop leaves prematurely in severe cases.
Comprehensive Control Plan
1. Maintain a planting distance of more than 2 meters to ensure ventilation and light2. Start prevention in early April, alternately using Mancozeb (protectant) and Tebuconazole (therapeutic agent)3. Thoroughly clean up diseased and damaged leaves in autumn to reduce the source of overwintering pathogens
Rust Disease of crabapple: Cross-Species Transmission
The orange-yellow pustular lesions that appear in late April are typical symptoms, existing in a parasitic cycle with nearby coniferous plants. Affected leaves curl and become crispy, severely affecting photosynthesis.
Measures to Block Transmission Chains
1. The planting isolation zone should be more than 50 meters away from cedars2. Spray Triadimefon suspension in the early stage of the disease and use Fluor硅azole + organic silicone adjuvant for enhanced effect in severe cases3. Add protective sprays once before and after the rainy season
Guidelines for Pest Control of Weeping crabapple
Aphids: Spring Tender Shoot Killers
From March to April, they congregate on tender buds to absorb sap, causing sooty mold disease. The pest situation can be judged by observing honeydew on the back of leaves.
Three-Dimensional Control Strategy
1. Hang yellow sticky traps for physical pest control2. Spray 22% Flonicamid suspension at 3000 times liquid, focusing on the back of leaves3. Introduce ladybugs and other natural enemies to establish ecological control
Red Spider Mites: The Nemesis of High Temperature and Dryness
Most prevalent from June to August, the lower leaves first show chlorotic spots, and severe cases lead to web formation and leaf drop.
Environmental Regulation Techniques
1. Regularly spray water on the leaves to increase humidity2. Alternate between 43% Pyridaben suspension and 20% Fenfluthrin suspension3. Spray lime sulfur in winter to clean the garden
By combining regular inspections, scientific medication, and ecological regulation, the diseases and pests of Weeping crabapple can be effectively controlled. It is recommended to establish a control log, recording the time, type of pesticide used, and control effects for each application, gradually forming a personalized maintenance plan. Paying attention to garden cleaning in winter and early spring prevention can reduce the incidence of diseases and pests by more than 60% throughout the year.