There were spores on the top side of some leaves which is unusual. There was a lot of dew on these plants, thus conditions were clearly favorable for disease development. The morning of 4 Sept spores of the downy mildew pathogen were observed on most leaves of the “outdoors always” control plants (these are the plants in the foreground of the first picture below).
The other 3 stayed on my deck to serve as “control” plants to document that the pathogen was present and conditions favorable for downy mildew to develop. I brought home 6 small plants on 20 Aug, put them in larger pots, and began bringing 3 of them in most nights (sometimes forgot). So if I kept basil plants in pots that would enable me to deny the pathogen the conditions it needs to infect by bringing the pots inside when needed (overnight and on rainy days) as humidity is never above 85% in my house. Humidity is below 85% during the day where I live in New York. These conditions often occur at night and on rainy days. The pathogen needs high humidity (at least 85%) or wet leaves to infect. With this source it is not possible to avoid a pathogen, and it is now obvious spores will be dispersed to my basil every summer. The pathogen produces spores that are dispersed by wind potentially long distances. This destructive disease has developed on basil in my garden every summer since 2008. The basil diseases listed above are specific to basil plants, but there are a few other problems with growing basil that can happen.Armed with knowledge about the pathogen’s biology, I had an idea of how it might be possible to not lose my basil once again to downy mildew at my home. The symptoms of downy mildew include yellow leaves that have fuzzy, grey growth on the undersides of the leaves.ĭowny mildew is aggravated by overly wet conditions, so if it appears on your basil plants, make sure you reduce overhead watering and that the basil plants have good drainage and good air circulation. Downy Mildewĭowny mildew is a relatively new basil disease that has only started to affect basil in the past few years. While there is no fix for bacterial leaf spot, you can minimize the damage by making sure that your basil plants have plenty of air circulation and that they are watered in a way so that the bacteria is not splashed onto the leaves. Symptoms of bacterial leaf spot are black or brown spots that appear on the leaves and streaking on the stems of the plant.īacterial leaf spot occurs when infected soil is splashed onto the leaves of the basil plant. This basil disease is caused by a bacteria called Pseudomonas cichorii. Bacterial Leaf Spot or Basil Shoot Blight Even if a basil or mint plant cannot be hurt by fusarium wilt, they can carry the disease and infect other plants. Destroy infected plants and don’t plant basil or other mint plants in that area for two to three years.
This basil wilt disease most commonly affects sweet basil varieties, but other basil varieties are still somewhat vulnerable.įusarium wilt is caused by a fungus that can be carried by either the soil that affected basil plants have been growing in or by seeds from infected basil plants. Common Basil Diseases Fusarium Wiltįusarium wilt is among the most common basil diseases. Keep reading to learn more about the diseases that can cause problems with growing basil. There are a few basil diseases that can cause basil leaves to turn brown or yellow, have spots, or even wilt and fall off. Basil is one of the most popular herbs to grow, but that doesn’t mean there are no basil plant problems.
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