![]() ![]() For me – fascinating and exciting to evolve my understanding of plant disease debugging as part of my seemingly endless effort to grow healthy vegetables and herbs. I also sterilized the scissors I used to clip off the infected leaves.Īh yes. If that doesn’t work, I’ll assume the soil is contaminated with the disease and will remove the soil where the plants were growing that had leaves with black spots. If the disease continues, I’ll consider a treatment such as a fungicide. For now I’ll keep an eye out for other plants that start showing black spots. I removed those that did from the basil plant, leaving the healthy looking leaves alone. At this point, this was the only affected plant. The class material on diseases pointed out those based on bacteria or fungi will find it’s way to other plants since wind, rain, insects… will transmit the bacteria/fungi to other plants. We live in the Pacific Northwest of the US where it rains quite a bit during this period. This diagnosis makes sense not just because observations appear similar to images provided for black spots on plants that are infected with a fungi or bacteria, but also because it most often occurs in late Spring/early Summer when the plant leaves stay wet longer than they should. While there are many posts on the Internet that discuss black spots, I found this post to help me. This leads me to believe the black spots are do to a bacteria infecting the plant. In this case, the black spots and area around had a waxy feel. High humidity and overhead watering promotes. Pearson) noted fungi on plants is typically dry whereas bacteria is typically waxy. Angular or irregular brown or black water-soaked spots on leaves streaks on stems. Within the section on Plant Health (week 4) of the Greenhouse 101 course, the teacher ( Brian J. The black spots are most likely due to either a bacteria or fungi. However, on closer inspection with a 10x magnifier, the areas that looked like there might be a webbing or small pest turned out to be dirt and/or dust. This results in yellow areas or black spots on the basil leaves. Exposure to too much sunlight or for too many hours can cause the leaves to literally get burnt because of the sun. When I first saw this picture of the back, I thought pests might be involved. Sunburn is a very common cause of black spots on basil, especially in regions where the summers are extreme. The area around the dark spots has a wax-like “look and feel.” Here is a picture of the sick basil plant: I’ll start with observations and finish with a diagnosis. The goal of this post is to discuss a disease I am seeing on one of the basil plants. To meet my cravings, I try to grow as much basil as I can outside starting in early summer months. I put it liberally on my salads, pizza, red sauces…. The teachers asked us to explore diseases in the plants we are growing. One of last week’s topic in the UF’s GreenHouse 101 was discovery and identification of plant diseases. ![]()
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