Occurrence and Control of Leaf spot of Carnation (Carnation)

The disease occurs in leaves and stems, and sometimes in flowers. When the disease occurs on the leaves, the disease spot is a light green water collapse-like small round spot, and gradually expands into a near-round, oval or strip-shaped spot, turning purplish brown, and slowly dying in the center of the spot, turning gray-white. The whole leaf was twisted and hung upside down on the stem. When the disease infects the stem, it often occurs at the fork of the branch and the wound caused by picking the bud. The disease spot is long and grayish brown, and in severe cases, the disease spot cuts off the stem, withering the upper branches and leaves. When the disease infects flowers, it often causes harm on pedicels and bracts. When there are many disease spots on bracts, flowers can not open or appear deformities. 2. As the disease can occur every year, preventive fungicides such as manganese, zinc, paracetamol and chlorothalonil must be sprayed once a week, especially after cutting flowers. 75% chlorothalonil, 50% carbendan 500 times or 1% Bordeaux solution can be used.

Occurrence and control of carnation leaf spot carnation, also known as carnation, musk carnation, perennial herbaceous flowers. Originated from Europe and the United States, since the introduction, because of its large color beauty, rich color, so often do greenhouse cultivation for the production of fresh cut flowers. It can also be cultivated in flower beds in the open field, and it is very popular. However, carnation is easily infected with leaf spot disease, which affects its growth and development and reduces the yield and quality of fresh cut flowers. According to the observation and control experiment for many years, the occurrence regularity and control methods of carnation leaf spot disease were summarized as follows:

Symptoms and occurrence regularity of carnation leaf spot the pathogen of carnation leaf spot overwinters on the remains of diseased plants with hyphae and molecular spores and can survive in the soil for about a year. When the temperature rises and the leaf surface is moist for a long time, the pathogen is easy to grow rapidly. The optimum temperature for mycelial growth was 25-30 ℃ (26 ℃). The molecular spores began to germinate at 18 ℃ 27 ℃ (24 ℃), spread through air and water, invaded from stomata, wound or direct invasion, and the incubation period was 10 ℃ 60 days. Therefore, the disease can occur in greenhouse cultivation every year, and in open field cultivation from 4mi to November. The disease occurs in leaves and stems, and sometimes in flowers. When the disease occurs on the leaves, the disease spot is a light green water collapse-like small round spot, and gradually expands into a near-round, oval or strip-shaped spot, turning purplish brown, and slowly dying in the center of the spot, turning gray-white. The whole leaf was twisted and hung upside down on the stem. When the disease infects the stem, it often occurs at the fork of the branch and the wound caused by picking the bud. The disease spot is long and grayish brown, and in severe cases, the disease spot cuts off the stem, withering the upper branches and leaves. When the disease infects flowers, it often causes harm on pedicels and bracts. When there are many disease spots on bracts, flowers can not open or appear deformities. Prevention and control measures 1. Select strong and disease-free cuttings, remove the diseased body, keep the plant surface dry as far as possible, and carry out crop rotation for more than 2 years in places with good ventilation and good drainage. The greenhouse should be well ventilated, which is important before dusk. two。 As the disease can occur every year, prophylactic fungicides such as manganese, zinc, paracetamol and chlorothalonil must be sprayed once a week, especially after cutting flowers, with 75% chlorothalonil, 50% carbendan 500 times or 1% Bordeaux solution. Occurrence and control of leaf spot of carnation

China Garden Network June 8 news: Carnation, also known as carnation, musk carnation, perennial herbaceous flowers. Originated from Europe and the United States, since the introduction, because of its large color beauty, rich color, so often do greenhouse cultivation for the production of fresh cut flowers. It can also be cultivated in flower beds in the open field, and it is very popular. However, carnation is easily infected with leaf spot disease, which affects its growth and development and reduces the yield and quality of fresh cut flowers. According to the observation and control experiment for many years, the occurrence regularity and control methods of carnation leaf spot disease were summarized as follows:

Symptoms and occurrence regularity of leaf spot of carnation

The pathogen of carnation leaf spot overwintered on the remains of diseased plants with hyphae and molecular spores and could survive in the soil for about a year. When the temperature rises and the leaf surface is moist for a long time, the pathogen is easy to grow rapidly. The optimum temperature for mycelial growth was 25 ℃ 30 ℃ (the best 26 ℃). The molecular spores began to germinate at 18 ℃ 27 mol (the best 24 Murray), spread through air and water, and invaded directly from stomata, wounds or direct invasion. The incubation period was 10 Murray 60 days. Therefore, the disease can occur in greenhouse cultivation every year, and in open field cultivation from 4mi to November. The disease occurs in leaves and stems, and sometimes in flowers. When the disease occurs on the leaves, the disease spot is a light green water collapse-like small round spot, and gradually expands into a near-round, oval or strip-shaped spot, turning purplish brown, and slowly dying in the center of the spot, turning gray-white. The whole leaf was twisted and hung upside down on the stem. When the disease infects the stem, it often occurs at the fork of the branch and the wound caused by picking the bud. The disease spot is long and grayish brown, and in severe cases, the disease spot cuts off the stem, withering the upper branches and leaves. When the disease infects flowers, it often causes harm on pedicels and bracts. When there are many disease spots on bracts, flowers can not open or appear deformities.

Prevention and cure measures

1. Select strong and disease-free cuttings, remove the diseased body, keep the plant surface dry as far as possible, and carry out crop rotation for more than 2 years in places with good ventilation and good drainage. The greenhouse should be well ventilated, which is important before dusk.

two。 As the disease can occur every year, prophylactic fungicides such as manganese, zinc, paracetamol and chlorothalonil must be sprayed once a week, especially after cutting flowers, with 75% chlorothalonil, 50% carbendan 500 times or 1% Bordeaux solution.