Symptoms and control of black spot of lotus

Lotus (details) is a plant that some friends like to raise in the courtyard, which can be cultivated in all parts of our country, and can be cultivated in soil, pot and other cultivation methods. However, raising lotus is prone to black spot, which not only affects the ornamental value of lotus, but also affects the health of lotus. The editor will introduce you to the black spot of lotus. If you also raise lotus, you might as well study it carefully.

Lotus (details)

Symptoms of the disease

At the beginning of the disease, the leaves have round macula, and then gradually expand into irregular dark brown disease spots, the distribution of disease spots is uneven, but the general veins are not affected. There is a yellow halo in the outer circle of the disease spot, there are irregular wheel lines on the disease spot, and the obvious black mold layer "curls on the leaf edge" in the middle stage of the disease. In the later stage, the whole leaf is scorched and died.

Second, occurrence regularity

The pathogen overwintered with mycelium on the remains of the diseased plant, and the disease began in mid-late May, and the peak period was from June to September. The disease could be aggravated by high temperature, high humidity and airtight environment.

III. Prevention and control methods

After sprouting in spring, spray 70% mancozeb wettable powder 500 times to prevent it. Cut off the diseased leaves in time to block the source of infection. Kill aphids, shell insects and other piercing pests in time. If it occurs, 75% chlorothalonil wettable granule 1000 times solution and 70% thiophanate methyl wettable granule solution can be sprayed alternately, each time at an interval of 8 to 10 days.

Symptoms and control of black spot of lotus

China Garden Network, July 30: black spot of lotus is an infectious disease, which occurs in all cultivated areas of lotus. It can also harm aquatic flowers such as water lilies and king lotus. The symptoms, occurrence regularity, prevention and treatment methods are introduced as follows:

First, at the beginning of the onset of the symptoms, the leaves have round macula, and then gradually expand into irregular dark brown spots, the distribution of disease spots is uneven, but the general veins are not affected. There is a yellow halo in the outer circle of the disease spot, there are irregular wheel lines on the disease spot, and the obvious black mold layer "curls on the leaf edge" in the middle stage of the disease. In the later stage, the whole leaf is scorched and died.

Second, the pathogen overwintered with mycelium on the remains of the diseased plant, and the disease began in mid-late May, and the peak period was from June to September. The disease could be aggravated by high temperature, high humidity and airtight environment.

Third, control methods after sprouting in spring, spray 70% mancozeb wettable powder 500 times solution to prevent. Cut off the diseased leaves in time to block the source of infection. Kill aphids, shell insects and other piercing pests in time. If it occurs, 75% chlorothalonil wettable granule 1000 times solution and 70% thiophanate methyl wettable granule solution can be sprayed alternately, each time at an interval of 8 to 10 days.

Occurrence symptoms and control of black spot of lotus

Black spot of lotus is an infectious disease, which occurs in all cultivated areas of lotus, and can be damaged by soil and potted plants. the disease can also harm aquatic flowers such as water lilies and king lilies. The symptoms, occurrence regularity, prevention and treatment methods are introduced as follows:

First, the symptoms: at the beginning of the disease, the leaves have round macula, and then gradually expand into irregular dark brown disease spots, the distribution of disease spots is uneven, but the general veins are not affected. There is a yellow halo in the outer circle of the disease spot, there are irregular wheel lines on the disease spot, and the obvious black mold layer "curls on the leaf edge" in the middle stage of the disease. In the later stage, the whole leaf is scorched and died.

Second, the law of occurrence: the pathogen overwintered with mycelium on the remains of the diseased plant, and the disease began in mid-late May, and the peak period was from June to September. The disease could be aggravated by high temperature, high humidity and airtight environment.

Third, prevention and control methods: after sprouting in spring, spray 70% mancozeb wettable powder 500 times to prevent it. Cut off the diseased leaves in time to block the source of infection. Kill aphids, shell insects and other piercing pests in time. If it occurs, 75% chlorothalonil wettable granule 1000 times solution and 70% thiophanate methyl wettable granule solution can be sprayed alternately, each time at an interval of 8 to 10 days.