We are seeing some of the leaves of our loofah turning yellow and others seem to have a fungus of some type. For the yellowing I have tried adding organic fertilizer. For the fungus I have tried spraying a mixture of baking soda and water and long w some hydrogen peroxide water mixture. Nothing seems to he helping. Here are a few photos. Any help would he greatly appreciated
Yamhill County Oregon plant diseases
Hi and thanks for contacting Ask an Expert.
I have done a bit of research and the first leaf looks like it could be the start of cucumber mosaic virus which can affect all the curcubits and other veggies. There is no cure for this virus, if that is what it is. It can be transmitted by seed, infected plants, human hands (touching the plants), and aphids and cucumber beetles. The plant should be removed, bagged and thrown away. It can infect other plants.
The second picture with all the white on it - did it start out yellow?
The second picture could be the end result of mildew but it looks like it is through the life cycle and dried out.
The mildew can be sprayed organically with lime/sulfur or 100% pure Neem oil. I just learned that Neem oil with other ingredients whether it says organic or not may have some very toxic chemicals added to it such as Malathion. Lime/sulfur can be found at Wilco or Coastal stores. I have found 100% pure Neem oil online. I am attaching some links for your information. Both of these sprays will kill aphids as well as any insect it is sprayed on.
The second link states the use of insecticides to deter aphids can help. This would depend on how advanced the virus. There are any number of pictures online - Google cucumber mosaic virus. Loofahs are part of the cucumber family.
If you have further questions, please re-contact us.