Diseases of Cornus Officinalis
As an important source of traditional Chinese medicinal materials, Cornus Officinalis often suffers from various diseases during its growth process. These diseases not only affect the normal development of the plants but also directly lead to reduced fruit yield or even complete crop failure. This article will systematically analyze the characteristics of four typical diseases and provide scientific control measures.
Key Points for Angular Leaf Spot Control
Symptom Identification
Mainly affects the leaves, initially appearing as brown spots on the leaf edges, which gradually expand to form angular lesions. During the rainy season, large areas of the leaves can curl and turn yellow, leading to early aging of the plants. Observations show that the incidence rate can reach 68% after consecutive rainy days for more than 3 days.
Comprehensive Control Strategy
Completely remove diseased and damaged leaves before the early spring germination, and apply circular trenching with decomposed organic fertilizer to enhance tree vigor. Alternate spraying with Mancozeb 400 times liquid and Tebuconazole 1500 times liquid at the initial stage of the disease, with a 10-day interval for better efficacy.
(T-J) Disease Management Throughout the Process
Characteristics of Fruit Damage
Mainly infects young fruits, forming concentric ring-shaped sunken spots. Under high humidity, the surface of the lesions produces pink conidia piles, which can lead to a fruit drop rate of over 50% in severe cases.
Key Control Nodes
Immediately spray with Pyraclostrobin suspension after flowering, and use Prochloraz Manganese Salt for fruit surface treatment before bagging. Combine with winter pruning to remove diseased and僵 fruits, and maintain a spacing of over 2.5 meters between plants to ensure ventilation and light.
Systematic Control of Powdery Mildew
Typical Symptom Manifestation
White powdery substance appears on both sides of the leaves, which later turns gray-brown and is accompanied by black cleistothecia. This disease can reduce photosynthetic efficiency by 40%, and special attention should be paid to monitoring during the high-incidence period from June to August.
Biological Control Solution
Promote the use of Bacillus subtilis wettable powder, combined with amino-oligosaccharides to enhance plant resistance. For facility cultivation, it is recommended to install UV light supplements to inhibit the繁殖 of pathogens.
Techniques for Eliminating Grey膏药 Disease
Branch and Trunk Disease Identification
Forms circular fungal membranes at the crotch of the main trunk, which can cause longitudinal cracking of the bark in severe cases. The incidence rate in old-age orchards can reach 35%, with special monitoring required for plants over 10 years old.
New Control Methods
Remove the fungal membrane in early spring and apply Clove Fungicide Healer, combined with drip irrigation of seaweed acid water-soluble fertilizer. Promote the use of electric high-pressure spray machines for precise trunk application, ensuring deep penetration of the medicine.
By establishing a disease early warning system and implementing precise prevention and control measures according to the phenological period, the loss of Cornus Officinalis diseases can be effectively controlled within 5%. It is recommended that growers establish field management records, regularly conduct leaf nutrient testing, and fundamentally enhance plant disease resistance.