Symptoms and control methods of morning glory white rust

The shape of morning glory is very unique, it is an annual trailing herbaceous flower, but white rust is a common disease of morning glory, if you do not pay attention to prevention and control, it is easy to reduce the ornamental value of morning glory. So what are the symptoms of morning glory white rust? How to prevent and cure it?

Morning glory

First, symptoms

The main sites of the disease were leaves, petioles and tender stems, and there were light green spots on the leaves at the initial stage of the damaged leaves. After that, it gradually became light yellow, the edge was not obvious, and when it was serious, it expanded into a large disease spot, and in the later stage, a white scar appeared on the back of the disease part. when it ruptured, it emitted white powder, which was the cyst spores of the pathogen, and when the tender stem was damaged, the flowers and stems were twisted. When the disease spot surrounded the petiole and shoot, the host part above the ring cut grew poorly, shrunk and died.

Second, the pathogen and the law of incidence

The pathogen is Albugoipomoeae-panduranae, a fungus of the genus Puccinia. The pathogen overwintered as oospore in the diseased tissue. In the following spring, the oospore germinated and produced sporangia, which invaded the petunia and other plants of the family Petunia. Generally, the disease was at its peak from August to September, and the morning glory was planted in the carrier and became the source of infection in the following year.

III. Prevention and control methods

1. Remove the diseased plant in time and destroy it. To reduce the infection of seeds.

2. The disease-free seeds should be selected as propagation seeds, and the seeds should be disinfected before sowing. Avoid rotation with plants of Convolvulaceae.

3. At the initial stage of the disease, penicillium shark 1000 murine 1500 times liquid or 50% Phytophthora 500 times liquid, spray once every 10 to 15 days has a better control effect.

Symptoms and preventive measures of morning glory white rust

Morning glory white rust is a disease often encountered in family maintenance of morning glory. Today we will take a look at the symptoms and preventive measures of morning glory white rust.

The main results are as follows: (1) the symptom spot is light yellow at first, and there is no obvious edge. In severe cases, many disease spots gather into large disease spots, which surround the petiole and tender branches, which make the flowers and stems twist and atrophy, and make the plant grow poorly. In the later stage, powdery conidia appeared in the small sore with white protuberance. Damage leaves, petioles, tender stems and flowers.

two。 The characteristic of the disease is that morning glory seeds carry bacteria and become the source of the disease at the beginning of next year.

Symptoms and preventive measures of morning glory white rust

Control methods: strengthen fertilizer and water management, improve environmental conditions, burn diseased plants and fallen leaves, remove weeds, reduce disease sources, spray Bordeaux solution at the initial stage of the disease, spray once every 15 days, a total of two or three times.

Control methods of morning glory white rust

Morning glory white rust occurs every year in the plant map of Shanghai. The main results are as follows: (1) the disease spot of morning glory white rust is light yellow at first, and there is no obvious edge 9. In severe cases, many disease spots expand and converge into a large mass of disease phthalein to surround the petiole and tender shoots, so that the flowers and stems twist and atrophy, and the Huan plant grows poorly. In the later stage, powdery meristem robes were released in the small sores with white protuberances. Harm the leaves, petioles, tender stems and flowers of morning glory. (2) the diseased seedlings overwintered in the diseased tissue with egg hugs, which became the source of the first infection in the following year. The disease is common between August and Ming every year. (3) the control methods should be used to remove the susceptible plants, leaves and stems, improve the environmental conditions, eliminate weeds and reduce the source of disease. Squeak 1% Bordeaux thick, spray once every half a month, two or three times in a row.