What causes white leaves on loofah plants

Loofah leaves sometimes turn white, and the specific white symptoms are not consistent, so the causes differ too. Some are caused by diseases, some by the plant itself, or by the growing environment, and the diseases also differ, with different symptoms. When white leaves appear on the loofah we grow, it is best to observe the symptoms first so we can know the cause; only by finding the pathogen can we choose a suitable solution.

1. Viral disease

The main viral disease involved is actually Cucumber green mottle mosaic virus, which mainly harms plants of the Cucurbitaceae family. Viral disease is a soil-borne disease, but human field activity can also cause leaves and stems to rub together and spread the virus, and seeds can carry the pathogen. So it is best to disinfect the seeds before sowing. Soil where the disease has occurred cannot continue to be planted and should be rotated with other crops. Alternatively, the soil should be finely sprayed with a disinfectant and exposed to the sun.

2. Plant senescence

When the plant approaches senescence in autumn, you may notice that the leaves sometimes turn white, and some even become hard; this is a sign of senescence. After all, loofah is an annual plant, and its leaves age easily; sometimes some aging leaves also show whitening. You can appropriately supplement some nitrogen fertilizer to prevent the leaves from aging in the early growth stage.

3. Poor ventilation

Sometimes the growing area is somewhat shaded, or the field is somewhat low-lying, with high humidity, excessive planting density and a closed-in environment that cannot ventilate and transmit light well, which causes white leaves. In the same year you can water on some ferrous sulfate to improve it, or use Yelübao. For potted growing, you can water on a little yogurt. This can reduce the symptoms. In the future, you can plant in a place with ample sunlight and good ventilation.

4. Loofah powdery mildew

If the white leaves are covered with a white powdery substance, then it is powdery mildew. For diseases, control must be early; it is best to use a 20% triadimefon EC 1000-fold solution for spray control, generally once a week, to avoid phytotoxicity, but it should not be spaced too long either, or the effect will be poor. Used continuously about 3 times, the effect is obvious.

5. Loofah white spot disease

Sometimes the surface turns white, but it is white spots, not a whole patch. If there is mycelium on the back, you can confirm it is white spot disease. As soon as it is discovered, promptly use 50% carbendazim together with 50% benomyl wettable powder 1500-fold solution for spray control. Using a single agent alone has an unclear effect. About 2 to 3 applications can cure it. In production, a variety of agents can also be chosen.

When loofah leaves turn white, first observe what the symptoms are, identify the root cause, and then use the corresponding method to improve and control it, so the plant can stay healthy and grow well.