Treatment of bacterial leaf spot disease in muskmelon in greenhouse

In recent years, with the expansion of the cultivation area of ​​muskmelon in the protected area and the increase of the multiple cropping index, the types of melon diseases have also increased. In addition to the frequently occurring diseases, such as powdery mildew, downy mildew, and blight, bacterial leaf spot has appeared in the past two years. The disease has a wide area of ​​disease and a large degree of harm, which has aroused everyone's concern. In some areas, the occurrence and prevention of this disease is still not very clear. It is often confused with downy mildew. Because of the misuse of pesticides against downy mildew, it can not receive better control effect and bring some losses to production. The causes and prevention methods of the disease are described below.

First, the pathogen

According to reports, the pathogen of melon bacterial leaf spot disease is Xanthomonas oryzae. Its development temperature is 25-28 °C, 36 °C can grow, and 40 °C die. It mainly infects the leaves, stems and fruits of melon plants.

Second, the symptoms

(1) When the leaves are inoculated, they are water-soaked round spots, which gradually develop into small yellow-brown spots on the edges, which expand and brown, and develop along the veins to the petiole. Finally, multiple lesions heal into large brown lesions. It is not easy to see the pus on the back of the diseased leaves, and the lesions are not polygonal, which is the main difference from downy mildew.

(2) The stem vines are brown lesions, and then the stems of the lesions are enlarged and rotted, and the tops of the stems are withered and finally die.

(3) The incidence of young fruit and immature fruit is a number of green water-immersed spots on the peel. After the fruit matures, it develops into an irregular central uplifted cork lesion, and the lesion is still surrounded by green water. It directly affects the appearance of the fruit, so that the fruit that is about to mature loses the value of the commodity and reduces the economic income.

Third, the infection route

(1) The pathogen can be attached to the seed. When the seed is germinated, it invades the stem and leaf. It can also remain on the residual plant and overwinter in the soil. In the coming year, the water droplets invade the plant from stems, leaves, pores and water holes.

(2) After the plants are propagated, they overflow from the lesions and stomata, and are scattered with the water droplets to carry out repeated infection.

(3) It is easy to develop under the condition of high temperature of 25-28 °C and high humidity, and the temperature and dryness of the climate is relatively light.

Fourth, prevention measures

(1) Before seeding, seed disinfection should be carried out, soaking with 45% dasen ammonium water solution 300 times for 15-20 minutes, rinsing the seeds with water and then germination.

(2) Before the planting, the shed is treated with chlorinated bitumen fumigant, especially the stalk is a greenhouse for melon crops. This work is more important.

(3) Strengthen ventilation management, reduce the humidity in the shed, avoid rain splashing, and give the germs an environment that cannot survive and spread.

(4) 72% agricultural streptomycin or neomycin can be sprayed at the beginning of the disease, or chloramphenicol can be sprayed. Spraying with 14% solution of copper lysine solution has a good effect.

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