Introduction to the control methods of Canna spindle spot

Canna

Regardless of the storm and the scorching sun, most of the canna blooms on four sides during the flowering period, except for some special varieties or canna with its own defects caused by diseases, along with people's attention and affection to the canna, it is gradually known that canna is easy to catch spindle spot disease if it is not properly maintained during the growing period, but it is mainly harmful to the healthy leaves of canna. So what should we do if this happens?

First, symptoms

The leaves infected by spindle spot appear reddish-brown fusiform spot, or dark brown oval spot, its size is 12 mm-6 mm, or 3 mm, the edge is dark brown, there is a greenish yellow halo on the periphery, and the boundary of the healthy tissue is obvious. In overcast and humid weather, a thin gray mildew layer is produced on the back of the spot.

Second, the pathogen and the law of incidence

Canna leaf spot is caused by Cercospora canna fungus infection. The bacteria mainly overwintered on the remains of diseased plants, and after the plant germinated and sprouted in the following spring, under suitable conditions, the bacteria spread with the wind and infected plants. The disease occurs in Kunming and other places in China.

III. Prevention and control measures

1. Clean the garden in autumn and winter, thoroughly remove the remains of diseased plants in the garden and destroy them centrally to reduce the number of overwintering bacteria so as to control the disease in the following spring.

two。 In flower beds with serious diseases, 50% carbendazim wettable powder 600-fold solution or 70% methyl topiramate wettable powder 800-fold solution can be sprayed at the initial stage of the disease. In order to improve the control effect, the diseased leaves can be removed before spraying.

Symptoms of prevention and control of Canna spindle spot: Canna spindle spot mainly harms leaves, and reddish-brown fusiform spots or dark brown oval spots appear on the infected leaves, with a size of 12 mm × 6 mm or 3 mm × 3 mm. The edge is dark brown, there is a greenish yellow halo on the periphery, and the boundary of the healthy tissue is obvious. In overcast and humid weather, a thin gray mildew layer is produced on the back of the spot. Pathogen and pathogenesis: Canna spindle spot is caused by Cercospora canna fungus infection. The bacteria mainly overwintered on the remains of diseased plants, and after the plant germinated and sprouted in the following spring, under suitable conditions, the bacteria spread with the wind and infected plants. The disease occurs in Kunming and other places in China. Prevention and control methods: 1, clean the garden: in autumn and winter, thoroughly remove the remains of diseased plants in the flower bed, and focus on destruction, reduce overwintering bacteria, in order to control the disease in the next spring. 2. Chemical control: flower beds with serious diseases can be sprayed with 50% carbendazim wettable powder 600 times, or 70% methyl topiramate wettable powder 800 / 1000 times. In order to improve the control effect, the diseased leaves can be removed before spraying. How to Control Canna Leaf spot

Canna spindle leaf spot affects the beauty of canna and is a major disease in the growth of canna. Today, the editor shares with you the prevention and control methods of canna spindle spot disease.

Canna spindle spot mainly harms leaves. The leaves infected by spindle spot appear reddish-brown fusiform spot, or dark brown oval spot, its size is 12 mm-6 mm, or 3 mm, the edge is dark brown, there is a greenish yellow halo on the periphery, and the boundary of the healthy tissue is obvious. In overcast and humid weather, a thin gray mildew layer is produced on the back of the spot. The following editor will introduce the prevention and control of Canna spindle spot disease:

The pathogen and incidence regularity of Canna spinosa leaf spot disease:

Canna leaf spot is caused by Cercospora canna fungus infection. The bacteria mainly overwintered on the remains of diseased plants, and after the plant germinated and sprouted in the following spring, under suitable conditions, the bacteria spread with the wind and infected plants. The disease occurs in Kunming and other places in China.

Measures for the prevention and control of banana leaf spot disease:

1. Clean the garden, clean the remains of diseased plants in the garden in autumn and winter, and destroy them centrally, so as to reduce the overwintering pathogens and control the disease in the following spring.

2. Flower beds with serious diseases can be sprayed with 50% carbendazim wettable powder 600-fold solution or 70% methyl topiramate wettable powder 800-fold solution at the initial stage of the disease. In order to improve the control effect, the diseased leaves can be removed before spraying.

The above is the article on the symptoms and control methods of Canna spindle spot disease compiled by Xiaobian. With a good prevention and control of spindle spot, we will not worry about the effect of shuttle spot on canna.

Extended reading:

Fertilization techniques, flower language, cultivation techniques, disease and pest control of canna