Kiri powdery mildew and its control
2019-09-15 08:04:17
Murraya paniculata Jack is also known as Thousand Lily. It is native to India and Malaysia. It is tropical and subtropical. Nine miles of Xiangxi is warm and humid, not cold-resistant, requires plenty of sunshine, and is slightly shade-tolerant. It is commonly cultivated in South China and southwestern provinces of China. It has a beautiful canopy, evergreens, pleasant flowers, and good aromatic flowers. It is used as a hedge or in a garden and around a building. With the development of urban afforestation, the occurrence of powdery mildew in the field has been widespread, affecting plant growth and development, and greatly reducing ornamental value. In order to cause the greening management personnel to pay attention to the prevention of powdery mildew. To ensure the normal growth of green plants, effectively display their garden functions and greening benefits, and briefly describe the occurrence characteristics and control methods of the powdery mildew disease of Jiuli.
1. Symptoms of powdery mildew mainly infest the young shoots, leaves, petioles, and so on. At the early stage of disease, chlorotic spots appeared on the leaves, white small spots appeared, and gradually enlarged into a garden-shaped or irregular-shaped white spot. In severe cases, the bottom of the leaves was covered with white powder. In early spring, the buds became infected, and the spreading leaves often covered with white powder on both sides. The leaves shrank and shuffled, and the deformity was distorted. Then, the leaves and petioles fell off, resulting in shoot tipping. The old leaves are more resistant to disease, when the leaves turn green, they become infected, or the climate is not suitable for disease development. The white spots of the lesions fade into yellow spots, forming mottled and yellowing leaves. The leaves fall early, weakening the tree vigor and affecting the ornamental value.
2. Pathogens The pathogenic bacteria is a fungus belonging to the genus Oidium sp., mycelium is superb, and the sucker protrudes into the host surface to attract nutrients. Pathogens use mycelia to overwinter on diseased plants. In the spring of the following year, when the environmental conditions are appropriate, the mycelium begins to grow and spread, and a large number of conidia are produced. The conidia spread through the airflow to the tender tissue, and the pathogen can be repeatedly infested. The conidia germinate and penetrate the stratum corneum directly to invade and absorb the nutrients in the host cells. In Nanning, Guangxi, every year from April to April and from September to November is the epidemic period. In the warm and dry season, the onset is rapid, and the continuous raining conditions are not conducive to the occurrence of powdery mildew. The fertile soil, high nitrogen and low potassium, plant tissue growth is soft, which is conducive to the occurrence of disease. Large planting density, improper trimming, poor ventilation and light transmission are conducive to disease occurrence. Extensive management, plant weakness is a serious disease.
3, control methods
3.1 reduce the amount of bacteria overwintering. In winter, the pruning shears remove the diseased leaves and leaves, completely remove the litter, and burn them together. During the period of overwintering and sleeping, it was sprayed with Baume 3 degree lime sulfur or 3000 times solution of sodium pentachlorophenolate solution or 1% copper sulfate solution to kill the overwintering bacteria.
3.2 Reasonable planting density. Combining with the needs of greening, appropriate planting density should be adopted; according to the requirements of modeling, reasonable pruning should be carried out so as to facilitate ventilation and light transmission and reduce the occurrence of diseases.
3.3 Strengthen management, improve environmental conditions, and increase plant resistance to disease. Rational fertilization, increase phosphorus, potassium fertilizer, nitrogen fertilizer should be appropriate.
3.4 Chemical control. Before germinating in early spring, spraying sulfur dioxide at 2 degrees of Baume eliminates the source of overwintering bacteria. During the onset, 50% carbendazim wettable powder 1000x, or 25% triadimefon 1500x, or 50% phenylenede 1500x, or 65% zeocin 600x800x, or sodium bicarbonate 250 times liquid spray. Continuous spraying 2 or 3 times, once every 10 to 15 days.
1. Symptoms of powdery mildew mainly infest the young shoots, leaves, petioles, and so on. At the early stage of disease, chlorotic spots appeared on the leaves, white small spots appeared, and gradually enlarged into a garden-shaped or irregular-shaped white spot. In severe cases, the bottom of the leaves was covered with white powder. In early spring, the buds became infected, and the spreading leaves often covered with white powder on both sides. The leaves shrank and shuffled, and the deformity was distorted. Then, the leaves and petioles fell off, resulting in shoot tipping. The old leaves are more resistant to disease, when the leaves turn green, they become infected, or the climate is not suitable for disease development. The white spots of the lesions fade into yellow spots, forming mottled and yellowing leaves. The leaves fall early, weakening the tree vigor and affecting the ornamental value.
2. Pathogens The pathogenic bacteria is a fungus belonging to the genus Oidium sp., mycelium is superb, and the sucker protrudes into the host surface to attract nutrients. Pathogens use mycelia to overwinter on diseased plants. In the spring of the following year, when the environmental conditions are appropriate, the mycelium begins to grow and spread, and a large number of conidia are produced. The conidia spread through the airflow to the tender tissue, and the pathogen can be repeatedly infested. The conidia germinate and penetrate the stratum corneum directly to invade and absorb the nutrients in the host cells. In Nanning, Guangxi, every year from April to April and from September to November is the epidemic period. In the warm and dry season, the onset is rapid, and the continuous raining conditions are not conducive to the occurrence of powdery mildew. The fertile soil, high nitrogen and low potassium, plant tissue growth is soft, which is conducive to the occurrence of disease. Large planting density, improper trimming, poor ventilation and light transmission are conducive to disease occurrence. Extensive management, plant weakness is a serious disease.
3, control methods
3.1 reduce the amount of bacteria overwintering. In winter, the pruning shears remove the diseased leaves and leaves, completely remove the litter, and burn them together. During the period of overwintering and sleeping, it was sprayed with Baume 3 degree lime sulfur or 3000 times solution of sodium pentachlorophenolate solution or 1% copper sulfate solution to kill the overwintering bacteria.
3.2 Reasonable planting density. Combining with the needs of greening, appropriate planting density should be adopted; according to the requirements of modeling, reasonable pruning should be carried out so as to facilitate ventilation and light transmission and reduce the occurrence of diseases.
3.3 Strengthen management, improve environmental conditions, and increase plant resistance to disease. Rational fertilization, increase phosphorus, potassium fertilizer, nitrogen fertilizer should be appropriate.
3.4 Chemical control. Before germinating in early spring, spraying sulfur dioxide at 2 degrees of Baume eliminates the source of overwintering bacteria. During the onset, 50% carbendazim wettable powder 1000x, or 25% triadimefon 1500x, or 50% phenylenede 1500x, or 65% zeocin 600x800x, or sodium bicarbonate 250 times liquid spray. Continuous spraying 2 or 3 times, once every 10 to 15 days.
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