Detailed Guide to Identifying and Controlling Common Diseases of Loofah

Loofah can be said to be an essential cooling vegetable in summer, and large-scale planting bases basically all grow loofah. However, precisely because the planting area is too large, it is also vulnerable to diseases during the growing process. Below is an introduction to the diseases that affect loofah.

1. Loofah downy mildew

Loofah downy mildew mainly harms the leaves. Yellow spots appear on the leaf surface and expand into patches. In humid conditions, ink-black patches appear, spreading to one another, and the leaves wither, causing a serious drop in yield. The cause is that the downy mildew fungus overwinters on diseased plant debris; large temperature fluctuations and poor drainage make infection very likely. Downy mildew can be controlled with pesticides such as carbendazim wettable powder.

2. Loofah phytophthora blight

Loofah phytophthora blight mainly harms the fruit, and sometimes the vines are harmed as well. When the disease occurs, it starts from the flower base and extends all the way to the fruit; the melon quickly becomes soft and rotten, with a white substance. This is caused by molds such as flagellate fungi spreading on the seeds. Pesticides such as cymoxanil-mancozeb can be sprayed for sterilization, about once a week, depending on the situation.

3. Loofah anthracnose

Loofah anthracnose is caused by fungi. The patches are round but vary in size, and the color also differs under different temperature and humidity conditions. This can be prevented in advance by spraying drugs such as thiophanate-methyl wettable powder or anthracnose-ling, about once every 8 days, about 4 times in a row.

4. Gummy stem blight

Gummy stem blight mainly harms the vines, and the leaves and fruit are also harmed. The lesions on the vines are irregularly round, and a white liquid flows from the affected parts, eventually causing the vines to wither and die. The patches on the leaves look like the letter “u”, mostly brown, and will crack. The fruit, like the vines, has irregularly round spots, and the flesh rots.

5. Loofah powdery mildew

Loofah powdery mildew mainly harms the leaf stalks and the leaves and fruit. Irregular white patches form on the leaf surface, and later the entire leaf withers. This disease is hard to notice in its early stages, but once discovered it is difficult to treat, so it can only be prevented in advance. Spray Bordeaux mixture around July for prevention, about once a week, 2-3 sprays in total.

6. Loofah viral disease

Loofah viral disease is mainly spread through aphids and sap, among other transmission routes, and it causes spots to form on young leaves. They then turn yellow and wither. The incidence rate is higher during the high-temperature period in summer. With this disease, attention should be paid to temperature control and prevention of aphids. After infection, pesticides such as Virus A wettable powder should be sprayed for control.

The above are several common diseases of loofah. As an essential summer vegetable, planting protection is the most important thing for loofah. All vegetables can get diseases. These diseases are somewhat contagious for loofah. If they are found and cannot be remedied, the diseased melons should be dealt with immediately to avoid infecting other melons and affecting yield.