Q: What is that orange stringy stuff that is all over the place right now?
Dodder is a parasitic plant that attaches itself to wild plants, including California sage scrub. It is classified as an annual, so it will appear to come and go. Although it is parasitic, it will not normally kill its host plant. Mistletoe is another example of a parasitic plant.
Q: What are epiphytes, and how are they different from parasites?
Parasites attach to and derive all (or almost all) of their nutrition from their hosts. Epiphytes grow on other plants or objects for support, but don’t harm or take nutrients from the plants they attach to. Most species of epiphytes come from regions with humid climates, such as rainforests, and can obtain enough water from rain or fog. They derive nutrients from airborne particulates.
Some popular indoor plants can be classified as epiphytes. These include orchids, bromeliads, ferns, Spanish moss, and tillandsia (air plants).
Q: I built a raised garden three years ago. It’s 4′ x 12′. At the end of our first growing season, that dry white fungus formed on our Armenian cucumbers at one end of the garden. The next year, the same thing happened, but sooner. Last year, towards the end of winter, I only planted sweet snap peas across the back with wire mesh for them to climb. Once they started producing, we were getting tons of peas. Then, the fungus came back. Not just a little bit at one end, the whole garden! I ended up pulling all the plants and have no plans to replant. Is there a way to kill this fungus or do I have to remove and replace all the soil? I appreciate any help you can give me.
Powdery mildew can infect a variety of vegetable plants, particularly cucumbers, squash, and pumpkins. Growing conditions can make the problem worse. Try to plant in full sun, since the fungus thrives in shade. Avoid overcrowding plants to allow for better air circulation. When planting crops that are especially susceptible to powdery mildew, apply antifungal treatments early and repeatedly. Horticultural oils, such as Neem oil or jojoba oil, can offer some protection, but shouldn’t be used when the daytime temperatures are over 90 degrees. Sulfur-based treatments, such as Safer Garden Fungicide, are only effective at the first sign of disease. These should not be used within 2 weeks of using any oil-based treatment and should not be used when daytime temperatures are over 90 degrees. Biological control (Serenade) is somewhat less effective. For more information, see The University of California Statewide IPM Program webpage about Powdery Mildew on Vegetables.
Los Angeles County
mglosangeleshelpline@ucdavis.edu; 626-586-1988; celosangeles.ucanr.edu/UC_Master_Gardener_Program/
Orange County
ucceocmghotline@ucanr.edu; mgorange.ucanr.edu/
Riverside County
anrmgriverside@ucanr.edu; 951-955-0170; ucanr.edu/sites/RiversideMG/
San Bernardino County
mgsanbern@ucanr.edu; 909-387-2182; mgsb.ucanr.edu
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