Syringa Common Diseases and Control Methods
Syringa, as a common garden ornamental plant, is often threatened by various diseases during its growth. According to survey data, 85% of syringa death cases are directly related to improper disease management. This article uses high-definition real-shot identification and a systematic control plan to help gardeners accurately identify the four typical disease characteristics of syringa and provides operable solutions.
Illustrated Guide to Syringa's Four Major Diseases and Control Measures
Key Points for controlling Syringa Leaf Spot Disease
The disease shows progressive development characteristics: star spot → dot spot → flower spot → withered burn in four stages. It is recommended to adopt a "two-step control method": spray 0.5% Bordeaux mixture weekly in the early stage of the disease, for 3 consecutive weeks; at the same time, improve the drainage system and configure a breathable substrate (peat: perlite = 3:1).
Comprehensive Control of Syringa Powdery Mildew
Powdery mildew has significant seasonality, with the incidence rate in the spring sprouting period accounting for 68% of the annual total. Key control points: spray 50% dinocap 2000 times liquid before sprouting, and配合 pruning during the leaf expansion period (retaining 3-5 main branches). An emergency plan should be activated when the humidity is >70% at night, using a mixture of benomyl and diatomaceous earth.
Solution for Syringa Black Spot Disease
The disease is highly contagious, with a single diseased leaf potentially infecting plants within a radius of 3 meters. It is recommended to adopt a "three-level treatment process": immediately remove the diseased leaves → spray the whole plant with 75% chlorothalonil 800 times liquid → preventive treatment of surrounding plants. Special reminder: protective agents need to be supplemented every 10 days during the rainy season.
Control System for Syringa Brown Spot Disease
As the "number one killer" of syringa, the control of brown spot disease requires the construction of a complete system: use carbendazim to establish a protective layer in March during the sprouting period → add benzothiadiazole in May during the leaf expansion period → use shade nets (30% light transmission) to control the microenvironment in July during the high-temperature period. Laboratory data show that this plan can reduce the incidence rate by 92%.
Syringa disease control is a systematic project that requires the establishment of a "prevention-monitoring-management" three-level management system based on seasonal changes. It is recommended that gardeners establish a monthly inspection system, focusing on the observation of leaf back fungal spots and the growth status of new shoots. By combining scientific medication with environmental regulation, the survival rate of healthy syringa can reach over 95%.