Yellow Leaf Spot and Cannabis Plants. However, parasitic diseases are caused by contagious pathogens. If you see small brown spots trimmed in yellow, your plant might have a Leaf Spot Disease. Healthy indoor plants will be able to resist and fight off pests and diseases much better than weak plants. Poor air circulation will also cause the problem. During the summer months, especially if plants are watered by overhead sprinklers, sufficient moisture may be present for infection when the bacteria are splashed or blown on to leaves. These pathogens easily pass on from plant to plant, through air, soil, water, use of tools, insects, etc. The spots will vary in size and color depending on the plant and the strain of the disease, but commonly spots can be … Use cultural control practices like staking and mulching plants, and pinching off infected leaves to keep leaf spot diseases in check. ABSTRACT Disease dynamics of Cercospora leaf spot (CLS) of sugar beet was analyzed at two hierarchical scales: as vertical profiles within individual plants and in relation to disease on neighboring plants. This disease is mostly seen on dracaena. If you suspect anthracnose, remove the infected leaves and avoid getting water on other foliage in the future. Which host is it hiding on over winter?. Pathogen: caused by the fungus Cercospora sp. Cannabis plants are susceptible to a range of unique diseases that can do great harm, from . House Plant Diseases. The black spots on houseplants are a common fungal disease. This tomato plant disease fungus usually strikes after plants … As most fungal diseases affecting plants, among which cannabis, septoria belongs to the family Mycosphaerellaceae and forms part of the so-called leaf spot diseases. Anthracnose. Botrytis blight -- better known as gray mold -- is one of the more common afflictions of house plants.This fluffy, gray mold is a fungus that feeds on dying plant tissue. Potential Cause 3: Leaf Spot Disease. But if most of the foliage on the houseplant changes colour in part or whole there may be a cultural problem, often rectified by paying more attention to watering, feeding or moving the plant to a more suitable position indoors. If left untreated, black spot spreads rapidly and weakens plants severely. Early blight, late blight, and leaf spot are common fungal diseases of tomato plants. This disease is rarely deadly, although it does lessen the beauty of your Photinia.. Read on to learn about how to treat the disease and what causes it. Rot Bacterial Leaf Spot: Xanthomonas campestris pv.zinniae is the causal agent of bacterial leaf spot of zinnias, and the symptoms of infection are purplish spots that usually remain small, but they become angular in shape.Spots may develop a yellow halo. Cercospora leaf spot is a fungal disease that affects crops, ornamental plants, shrubs and flowers. You are most likely to see infections when new plant growth is occurring from late winter until summer. Marijuana growers must be aware of diseases that can affect their plants and possibly decimate their crops. Older leaves on healthy houseplants will naturally turn brown and die back over time as the plant matures, which is no cause for concern. Bacterial disease signs (difficult to observe, but can include): Bacterial ooze A good example of a disease every grower must be aware of is yellow leaf spot or leaf septoria. The plant will show you it is infested by wilting and generally looking dehydrated, it may be losing leaves quite rapidly. Spray plants weekly with a copper fungicide following periods of leaf wetness to reduce disease incidence. The diseases infects common garden plants, such as cabbage, and are caused by several closely related species of fungi. Fungal disease symptoms: Birds-eye spot on berries (anthracnose) Damping off of seedlings (phytophthora) Leaf spot (septoria brown spot) Chlorosis (yellowing of leaves) Stripe rust pustules on a winter wheat leaf is a symptom. How to Treat Fungus on a Houseplant. Leaf spot; Brown, yellow or black or water soaked spots will appear on the leaves. Bacteria are microscopic, single celled organisms that reproduce rapidly and cause a variety of plant diseases including leaf spots, stem rot, root rots, galls, wilt, blight and cankers. 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