Diseases and Pests of四季 crabapple and Their Control
As a common household green plant, 四季 crabapple's beautiful flowers are often threatened by diseases and pests. This article will deeply analyze the identification skills of 4 types of common pests and diseases and provide practical control solutions to help you create healthy and robust ornamental plants.
Types of 四季 crabapple Diseases and Pests and Control Solutions
Aphid Invasion: Tender Bud Killer
In spring and autumn, dense groups of aphids often inhabit new tender buds. The leaves that are sucked on show curling and distortion, and in severe cases, cause the plant to wither. It is recommended to adopt the "Three-Stage Treatment Method": use tobacco water (50g tobacco + 500ml water soaked for 24 hours) for spraying in the early stage; use yellow sticky pest control boards for physical control in the middle stage; and alternate spraying 20% imidacloprid 2000 times liquid and 10% flonicamid 1500 times liquid in severe infections, once a week for three weeks.
Red Spider Rampage: High-Temperature Nemesis
In dry summer conditions, red spiders densely covering the back of leaves can cause yellow spots and leaf fall. It is recommended to implement a "Environmental Control + Biological Control" combined strategy: maintain 60% air humidity, spray the back of leaves every three days; introduce predatory mites (release 30-50 per plant); and use 43% bifenthrin suspension 3000 times liquid in severe cases, focusing on spraying the back of leaves.
Leaf Roller Pest: Hidden Killer
Larvae wrap tender leaves with silk-like substances, causing typical reverse curling symptoms. It is recommended to use the "Morning Manual Capture Method": check the back of leaves in the early morning when dew is not dry, wear gloves to directly remove the pest bodies; and use suspended sex pheromone traps ( spaced 2 meters apart) and replace the lure core monthly.
Diseases and Pests of 四季 crabapple and Their Control
Stem Rot Disease Control: Root Defense Battle
This fungal disease initially presents as water-soaked brown spots at the base of the stem. Implement the "123 Maintenance Rule": a breathable matrix of 1 part perlite + 2 parts peat + 3 parts decomposed leaf soil; water with bio-agent containing Hartzia trichoderma (1:500 ratio); isolate the affected plants immediately, scrape the decayed tissue, and apply sulfur powder.
Scientific maintenance can reduce the risk of disease by 90%: maintain 4 hours of scattered light per day, keep the temperature between 18-25°C, use the immersion pot method for watering (2 times a week, 15 minutes each time). Rotate the pot regularly to ensure even lighting, and apply seaweed fertilizer monthly to enhance stress resistance.