Disease and Pest Control for Phalaenopsis
As a rare variety in the orchid family, Phalaenopsis is favored by horticulture enthusiasts for its elegant flower posture. However, disease and pest problems often困扰 gardeners during its care. This article focuses on the three most threatening diseases and pests in Phalaenopsis cultivation, combining professional control methods and practical experience to help you create healthy plants.
White Silk Disease Control System
Symptom Identification and Transmission Characteristics
The disease has distinct seasonal characteristics, with an 85% increase in incidence after the plum rain season. Initially, white mycelial threads can be seen at the base of the leaves, which, as the condition progresses, cause the vascular bundles to necrotize, leading to dehydration and plant collapse.
Three-Level Control Plan
Basic treatment involves replacing the top 5cm of soil containing fungi and sprinkling lime to adjust the pH. For severely affected plants, it is recommended to use a pentachloronitrobenzene solution (0.2% concentration) for root irrigation, and using a 50% light transmission shading net can enhance the control effect.
(T-J) Disease Systematic Control
Disease Development Pattern
The disease can occur throughout the year, with a high爆发 rate at 30°C combined with 70% humidity. Typical symptoms include brown streaks extending from the leaf tip to the base, and later forming wheel-shaped black conidial plates.
Chemical Control Essentials
Initially, spray 25% propiconazole emulsion (diluted 1500 times) combined with 0.1% potassium dihydrogen phosphate, with each treatment interval being 7-10 days. Before the rainy season, use wettable powder of mancozeb for preventive treatment.
Scale Insect Comprehensive Management
Pest Identification Features
The pest has an annual reproductive rate of 8-10 generations, with the optimal development temperature being 25-32°C. The nymph stage gathers on the back of the leaves to absorb sap and secretes honeydew that induces sooty mold disease.
Combination of Physical and Chemical Methods
For low-density infestations, use 75% alcohol cotton balls to wipe each leaf, combined with yellow sticky traps for monitoring. During outbreaks, use 22% flonicamid suspension (5000 times liquid) to spray the leaf axils, and it is recommended to apply the pesticide before the dew dries in the morning.
By establishing a regular inspection system and combining it with smart temperature and humidity monitoring equipment, the risk of disease can be predicted 15 days in advance. Maintaining a day-night temperature difference of 8-10°C and controlling the environmental humidity within the range of 55-65% can reduce the incidence of Phalaenopsis diseases and pests by more than 60%. Scientific control not only ensures plant health but also showcases its unique ornamental value.