Common Pests and Diseases of Lemon and the Latest Control Methods
The lemon tastes extremely sour and is a favorite food of many pregnant women, as well as good news for many people who love sour flavors. The lemon has many uses: it can be used for cooking, juiced into beverages, brewed in tea, and so on. It is rich in vitamin C and also contains many sodium elements, making it very beneficial to the human body. It can maintain the body's cell production and keep their normal growth. So more and more people are growing them, but many pests and diseases often occur during the growing process. What are the pests and diseases that harm lemons? How are they controlled? Let's take a look below.
1. Lemon scab
Symptoms: Scab mainly harms the new shoots, young leaves and fruit of the tree. The affected parts develop many water-soaked yellow patches, which also gradually become raised, forming a funnel shape. In severe cases, shoot tips become shortened, leaves become deformed, and fruit develop tumors. Scab is mainly caused by fungi. Media such as wind, rain and insects are all routes of transmission, and rainy weather is mostly the condition for onset.
Control methods: Carry out reasonable pruning of the fruit trees regularly, cutting off weak branches, diseased and pest-infested branches and other useless branches. When new shoots grow to about two cm, spray agents such as thiophanate-methyl for prevention, spraying about three times.
2. Lemon canker
Symptoms: Canker mainly harms the leaves, fruit and branches of the fruit tree. After the leaves are infected, yellow water-soaked spots first appear on the leaves, then begin to expand and extend into patches, and the leaves become raised. The center begins to sink and crack. Although diseased leaves do not become deformed, they can cause early falling. The symptoms on branches and fruit are not much different from those on leaves. It is mainly caused by pathogenic bacteria and spreads through media such as rainwater. Hot and rainy weather is when canker occurs most severely.
Control methods: Strengthen quarantine when selecting seeds, do not choose diseased seedlings, and prevent the introduction of diseased seedlings and diseased fruit. Choose disease-resistant seedlings, or disinfect the seedlings properly before planting. When new shoots grow to about five cm, spray an appropriate amount of agents such as streptomycin for control.
⟦NL>3. Lemon sooty mold
Symptoms: Sooty mold mainly harms leaves, branches and fruit. At the affected areas, a thin layer of dark brown mold spots first appears, and gradually expands, extends and merges together. Raised black mold layers with fuzz grow. At first, the sooty layer on the leaves is relatively easy to peel off, and after peeling off, small black spots can be seen. This disease mainly uses the honeydew of pests such as aphids and scale insects as nutrients and begins to reproduce on the leaf surface. It not only affects the plant's photosynthesis, but also secretes toxins that affect the plant's growth, causing a decline in fruit quality.
Control methods: First, the nutrient source of the disease must be cut off, and the control of pests such as aphids and scale insects should be strengthened. If pests are found, agents such as whitefly net should be sprayed promptly for control, eliminating the transmission vector of sooty mold. Strengthen orchard management and carry out reasonable pruning. Enhance air circulation between fruit trees, reduce sources of the disease. Lower the incidence rate.
The three diseases above are the ones that often appear when growing lemons. If the diseases are not treated in time and controlled with agents, the harm to lemon trees can be very great. Disease control is mainly based on prevention, strengthening the sanitary management of the orchard, and plowing and disinfecting the orchard after harvest. After all, the final yield of lemons is closely related to one's own economic interests, and I hope everyone will pay attention. To learn more related information, please continue to follow Qinnong Net!