MySheen

Control measures of anthracnose and yellowing in Magnolia

Published: 2024-11-05 Author: mysheen
Last Updated: 2024/11/05, Symptoms of anthrax: dark brown round or nearly round spots are produced on the leaves, and the edges are slightly deep. after expansion, the center gradually becomes grayish white, with a size of 2-8 cm. In the later stage, there are small black spots on the disease spots, that is, the conidium disk of the pathogen. When the humidity is high, the disease spot is overflowing with yellow slime, that is, the conidia of the bacteria. The disease is serious in rainy and wet weather. Prevention and treatment methods: at the initial stage of the disease, Bordeaux solution sprayed with 100 times of Bordeaux or 25% of Juling 500 times or 70% anthrax 600 times of anthrax to the United States. Etiolation

Anthrax

Symptoms: dark brown round or nearly round disease spots are produced on the leaves, and the edges are slightly deep. after expansion, the center gradually becomes grayish white, with a size of 2-8 cm. In the later stage, there are small black spots on the disease spots, that is, the conidium disk of the pathogen. When the humidity is high, the disease spot is overflowing with yellow slime, that is, the conidia of the bacteria. The disease is serious in rainy and wet weather.

Prevention and treatment methods: at the initial stage of the disease, Bordeaux solution sprayed with 100 times of Bordeaux or 25% of Juling 500 times or 70% anthrax 600 times of anthrax to the United States.

Chlorosis

Symptoms: at first, the young leaves on the tender leaf tips lost chlorosis, and then expanded from the leaf edge to the leaf base from the top to the bottom. After the chlorosis of the leaf margin, it gradually extends to the mesophyll tissue, making the intervein tissue turn green, and the veins continue to develop so that the leaf becomes milky yellow to milky white. In serious cases, the leaf margin is scorched, and even the whole leaf is dry and shedding. If the disease of 1-year-old seedlings is lower than that of normal plants, the height of 3-4-year-old seedlings is yellowed, which is about 30 cm shorter than that of normal healthy plants. Chlorosis leads to slow plant growth, shortening of internodes and shoot withering.

Iron deficiency symptoms should be supplemented with ferrous sulfate, specific methods: 1. The mung bean-sized ferrous sulfate was embedded under the basal cortex of the seedling, and then bandaged with plastic film to facilitate wound healing. two。 Apply ferrous sulfate into the trench, add rotten cake fertilizer and cover it with soil. 3. Choose to spray 0.5% ferrous sulfate solution or 500 times of yellow leaf fast green plant antiviral compound nutrient solution to the leaves before sunrise in the morning or after 4 o'clock in the afternoon, spray it again every 7-10 days or so, and spray it 2-3 times continuously.

 
0