How can you properly care for roses if you don't recognize these rose diseases?
A comprehensive analysis of the introduction to rose diseases, which you may not recognize, will help you take better care of your roses. Next, the site editor will introduce the topic to the netizens.
This is the 839th day of original articles.
This article is one of the original theories.
Excerpt from the "Three-Step Method for Rose Cultivation" series.
In yesterday's article, the focus was on the prevention and treatment of black spot and powdery mildew, besides these two most common rose diseases, there are also some other diseases that roses are prone to. Let's list them one by one today.
1. Downy Mildew
Rose downy mildew often occurs from April to June, usually caused by excessive humidity.
Downy mildew primarily affects the leaves of roses, causing涂抹-shaped brown spots on infected leaves.
Control methods: If roses get downy mildew, affected leaves should be removed and destroyed promptly, and fungicides should be sprayed for prevention and treatment.
For routine prevention, it's important to maintain good ventilation and prevent excessive humidity.
2. Grey Mold
Rose grey mold often occurs in spring and autumn when there are large temperature differences between day and night.
Grey mold primarily affects rose leaves and buds. When leaves are infected, they first develop water-soaked brown spots at the tips and edges, which are smooth and slightly sunken, and then expand and rot.
When buds are infected, red spots appear on the petals.
Control methods: Prevention is the main approach for grey mold, using fungicides like carbendazim and zineb for prevention. Infected buds and leaves should be removed promptly, and drugs such as速克灵 and duomeiwei should be used for treatment.
3. Leaf Blight
How can you properly care for roses if you don't recognize these rose diseases?
Rose leaf blight primarily occurs on leaves, initially appearing as yellow dots, then quickly expanding into irregular large spots. In severe cases, the leaves can dry up to 2/3 of the entire leaf, until the entire leaf dries up and falls off.
Control methods: Leaf blight can be treated with carbendazim or醚菌酯.
4. (T-J) Disease
In the early stages of the anthracnose disease, irregular light green patches appear on the leaves, which then expand into brown and dark purple, and finally turn greyish-brown, with darker edges.
When new shoots and flowers are infected, the lesions are similar to those on the leaves but are slightly sunken on the shoots. In severe cases, leaves wither and fall off, and new shoots rot and die.
Control methods: Prevention of anthracnose disease should focus on maintaining good ventilation. Infected leaves should be removed promptly, and fungicides such as metalaxyl or zineb should be sprayed for treatment.