How to treat cypress rust and how to cause it?

After the onset, 25% triadimefon 1500 times solution and 12.5% diniconazole 3000-4000 times solution can be selected for prevention and treatment.

How to treat cypress rust and how to cause it?

After the onset, 25% triadimefon 1500 times solution and 12.5% diniconazole 3000-4000 times solution can be selected for prevention and treatment. Spray once every half a month in the early stage of the disease, once a week in the severe stage of the disease, and spray continuously for about 3 times. It can be controlled by spraying 100- 150 times of 45% crystalline sulfur mixture and 500 times of 70% mancozeb wettable powder. Thoroughly cleaning the fallen leaves, fallen fruits and dead branches in the garden can reduce the source of bacteria.

First, how to treat cypress rust

At the onset stage, 1, 25% triadimefon 1500 times solution and 12.5% diniconazole 3000-4000 times solution can be used for prevention and treatment. During the control period, 2-5 degree sulfur mixture, 45% crystalline sulfur mixture 100- 150 times solution, 70% mancozeb wettable powder 500 times solution and 70% thiophanate-methyl 1000 times solution can be selected for spraying.

2. Cypress rust generally begins in late April and is severe from June to August, and it is most serious in summer when it is hot, humid, rainy or foggy. Spraying broad-spectrum preventive bactericide at the initial stage of onset, once every half month. In the severe stage of the disease, the therapeutic drugs are sprayed once a week and continuously for about 3 times.

3. Strictly isolate the host from the host plants, such as begonia, apples, pears and other seedlings from the host cypress at least 5 kilometers away. In order to reduce spore-borne diseases, infected plants can also be planted in the high altitude of infected plants to reduce the incidence.

4. From the end of autumn to the early spring of the following year or during the plant dormancy period, thoroughly clean up the plant residues hidden by pests and diseases such as fallen leaves, fallen fruits and dead branches in the garden, and reduce the source of bacteria by removing diseased branches and leaves.

Second, how is cypress rust caused?

1, cypress rust is mainly caused by two pathogens: Puccinia yamada and Puccinia pyrifolia.

2. The symptom of cypress rust is yellow spots on needles, axils and branchlets, which expand later and sometimes form swollen spindle gall on branches. In March of the following year, the epidermis of the wound gradually protruded and ruptured to reveal a reddish-brown or brown cone angle. In April and May, it swelled and burst in the rain, turning into a tongue-shaped apricot yellow, like a cypress? Flowering? And produce microspores, which begin to infect begonia or pear. In late June, yellow whiskers, namely rust spores, began to appear on the diseased spots on the back of leaves. Rust spores can be released from July to June in 65438+ 10, and spread to cypress twigs with the wind, invading twigs or leaves for overwintering, and gradually forming tumor-like winter spore piles. In winter, parasitism harms the shoots of cypress trees, and in summer, parasitism harms the leaves, fruits and shoots of apples, begonia, pears and other trees.