Honeysuckle, also known as Lonicera, is one of the traditional Chinese medicinal materials. It has the effects of clearing heat and detoxifying, anti-inflammatory and analgesic. In the cultivation process of honeysuckle, it often encounters the problem of black spots on leaves, which seriously affects the yield and quality of honeysuckle. This article will introduce the causes and control methods of black spot on honeysuckle leaves in detail to help the majority of growers solve this problem.
Reasons for Black Spot Formation on Honeysuckle Leaves1. Disease Factors
The main reason for black spots on honeysuckle leaves is disease infection, such as leaf spot disease, anthracnose, etc., which are caused by fungi and mainly spread through wind, rain, insects, and other means.
2. Environmental Factors
During the growth of honeysuckle, if exposed to high temperature, high humidity, poor ventilation, and other environmental factors, it is prone to black spots on leaves. Insufficient soil fertility and poor drainage will also affect the growth of honeysuckle, leading to black spots on leaves.
3. Fertilizer Factors
Excessive application of fertilizers such as nitrogen and phosphorus can easily lead to excessive growth of honeysuckle, reduced resistance, and thereby cause black spots on leaves. Improper application of fertilizers can also lead to imbalances in soil pH, affecting the growth of honeysuckle.
Preventive and Control Methods for Black Spot on Honeysuckle Leaves1. Select Disease-Resistant Varieties
Choosing honeysuckle varieties with strong disease resistance can effectively reduce the incidence of black spots on leaves.
2. Field Management
(1) Reasonable Planting Density: Reasonable planting density can increase ventilation and light transmission of honeysuckle, reducing the occurrence of diseases.
(2) Strengthen Drainage: Keep the soil moist and avoid waterlogging to reduce the occurrence of diseases.
(3) Scientific Fertilization: Apply fertilizers rationally, avoid excessive application of nitrogen and phosphorus fertilizers, and maintain a balanced soil pH.
3. Disease Control
(1) Agricultural Control: Timely removal of diseased and residual bodies to reduce the spread of pathogens.
(2) Chemical Control: In the early stage of the disease, you can choose 50% carbendazim wettable powder 800 times liquid, 70% methyl thiophanate wettable powder 800 times liquid, and other agents for spraying. Pay attention to the rotation of drugs to prevent drug resistance.
4. Biological Control
Using biological pesticides, such as Bacillus thuringiensis, Beauveria bassiana, etc., can effectively control black spots on honeysuckle leaves.
Black spot on honeysuckle leaves is a common problem in the cultivation process. Understanding its causes and control methods can help reduce the occurrence of diseases and improve the yield and quality of honeysuckle. Growers should strengthen field management, select disease-resistant varieties, and promptly control diseases to ensure the healthy growth of honeysuckle.
References:
[1] Zhang Wei, Li Xiaohong, Honeysuckle Disease and Pest Control Technology[J], China Modern Pesticide, 2018, 17(3): 1-3.
[2] Wang Xiaodong, The Occurrence Law and Control Measures of Honeysuckle Diseases and Pests[J], Agricultural Science and Technology, 2019, 40(5): 1-3.