What to Do When Lotus Gets Black Spot Disease? Symptom Identification and Control Methods

Lotus (detailed introduction) is a plant that some friends like to grow in their courtyards. It can be cultivated in all parts of our country, and it can be grown both in the ground and in containers. However, growing lotus makes it very prone to black spot disease, which not only affects the ornamental value of the lotus but also affects its health. The editor will now introduce lotus black spot disease to you. If you also grow lotus, you may want to study this carefully.

Lotus (detailed introduction)

I. Disease Symptoms

In the early stage of the disease, there are round yellow spots on the leaves, which gradually expand into irregular dark brown lesions. The lesions are unevenly distributed, but the leaf veins are generally not affected. The outer ring of the lesions has a yellow halo, and the lesions have irregular concentric rings, with an obvious black mold layer growing on them. In the middle stage of the disease, the leaf edges curl upward. In the later stage, the entire leaf becomes scorched and dies.

II. Occurrence Pattern

The pathogen overwinters as mycelium on diseased plant residues. The disease begins in mid-to-late May, and June to September is the peak period. High temperature, high humidity, and poorly ventilated environments can worsen the condition.

III. Control Methods

After sprouting in spring, spray 70% mancozeb wettable powder at 500 times dilution for prevention. Promptly prune off diseased leaves to block the source of infection. Promptly kill piercing-sucking pests such as aphids and scale insects. If an outbreak occurs, 75% chlorothalonil wettable granules at 800 times dilution and 70% thiophanate-methyl wettable granules at 1000 times dilution can be sprayed alternately, with an interval of 8 to 10 days each time.

Lotus Black Spot Disease Symptoms and Control

News from the China Landscape Web on July 30: Lotus black spot disease is an infectious disease that occurs in all cultivation areas of lotus. Both ground planting and container planting are affected, and this disease can also harm aquatic flowers such as water lilies and Victoria lilies. Its disease symptoms, occurrence pattern, and control methods are introduced as follows:

I. Disease Symptoms: In the early stage of the disease, there are round yellow spots on the leaves, which gradually expand into irregular dark brown lesions. The lesions are unevenly distributed, but the leaf veins are generally not affected. The outer ring of the lesions has a yellow halo, and the lesions have irregular concentric rings, with an obvious black mold layer growing on them. In the middle stage of the disease, the leaf edges curl upward. In the later stage, the entire leaf becomes scorched and dies.

II. Occurrence Pattern: The pathogen overwinters as mycelium on diseased plant residues. The disease begins in mid-to-late May, and June to September is the peak period. High temperature, high humidity, and poorly ventilated environments can worsen the condition.

III. Control Methods: After sprouting in spring, spray 70% mancozeb wettable powder at 500 times dilution for prevention. Promptly prune off diseased leaves to block the source of infection. Promptly kill piercing-sucking pests such as aphids and scale insects. If an outbreak occurs, 75% chlorothalonil wettable granules at 800 times dilution and 70% thiophanate-methyl wettable granules at 1000 times dilution can be sprayed alternately, with an interval of 8 to 10 days each time.

Symptoms and Control of Lotus Black Spot Disease

Lotus black spot disease is an infectious disease that occurs in all cultivation areas of lotus. Both ground planting and container planting are affected, and this disease can also harm aquatic flowers such as water lilies and Victoria lilies. Its disease symptoms, occurrence pattern, and control methods are introduced as follows:

I. Disease Symptoms:In the early stage of the disease, there are round yellow spots on the leaves, which gradually expand into irregular dark brown lesions. The lesions are unevenly distributed, but the leaf veins are generally not affected. The outer ring of the lesions has a yellow halo, and the lesions have irregular concentric rings, with an obvious black mold layer growing on them. In the middle stage of the disease, the leaf edges curl upward. In the later stage, the entire leaf becomes scorched and dies.

II. Occurrence Pattern:The pathogen overwinters as mycelium on diseased plant residues. The disease begins in mid-to-late May, and June to September is the peak period. High temperature, high humidity, and poorly ventilated environments can worsen the condition.

III. Control Methods:After sprouting in spring, spray 70% mancozeb wettable powder at 500 times dilution for prevention. Promptly prune off diseased leaves to block the source of infection. Promptly kill piercing-sucking pests such as aphids and scale insects. If an outbreak occurs, 75% chlorothalonil wettable granules at 800 times dilution and 70% thiophanate-methyl wettable granules at 1000 times dilution can be sprayed alternately, with an interval of 8 to 10 days each time.