Yellow Leaf Spot and Cannabis 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. While there’s a lot of causes, today we’ll focus in on one particular one: anthracnose. 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. Bacterial Leaf Spot Diseases. Hellebore leaf spot is caused by the fungus Microsphaeropsis hellebori and is a common disease on many hellebore species. Black spot overwinters in fallen leaves and branches. If left untreated, black spot spreads rapidly and weakens plants severely. Septoria has often caused many a gardener to wail in desperation. Leaf spot disease is caused by a fungi that cause black, brown or tan spots on leaves. 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. 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. Stem ends of fruits may be attacked, showing large, sunken black areas with concentric rings. Leaf spot will also cause problems for strawberry plants. This fungal disease is widespread, affecting all sorts of plants from fruits and vegetables through grains, trees (both fruiting and non-fruiting) and ornamental plants. Spray plants weekly with a copper fungicide following periods of leaf wetness to reduce disease incidence. The bad news is that your houseplant has fungal leaf spots. They survive in infected plants, debris from infected plants, on … The plant will show you it is infested by wilting and generally looking dehydrated, it may be losing leaves quite rapidly. Leaf spot; Brown, yellow or black or water soaked spots will appear on the leaves. 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. The disease will subsequently kill the leaf. You are most likely to see infections when new plant growth is occurring from late winter until summer. A good example of a disease every grower must be aware of is yellow leaf spot or leaf septoria. A related species, Pseudocercospora causes similar spots. It will further cause brown dusting on the leaves as well as blooms. The good news is that the poor thing’s prognosis for recovery with reasonable treatment is excellent. It is linked to high temperature and humidity. Marijuana growers must be aware of diseases that can affect their plants and possibly decimate their crops. Leaf Spot can appear on house plants, ornamentals in your outdoor garden, or even on your yard turf. The diseases infects common garden plants, such as cabbage, and are caused by several closely related species of fungi. Their spores are spread in raindrops and water splash. The black spots on houseplants are a common fungal disease. Leaf Disease identification:. 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. If you suspect anthracnose, remove the infected leaves and avoid getting water on other foliage in the future. Observe your lawn turf and plants closely for small brown spots on affected leaves that will increase in size as the disease progresses. Also a fungus, this leaf disease pops up toward the end of the grow, mainly affecting the flowers, says Dwyer—and while it’s mostly prevalent on outdoor crops, it’s not unheard of indoors. These can be caused by a fungus, a bacterium or a nematode, and in the case of septoria, the spots appear on the leaves … Which host is it hiding on over winter?. Discover how to identify, prevent and treat common house plant diseases, such as gray mold, bacterial leaf spot, sooty mold, and other types of house plant fungus. This is a common disease of Ligustrum species. This is a fungal disease that turns leaf tips first yellow, then brown, and can ultimately kill the entire leaf. Rot Another tomato plant disease fungus, Alternaria, also causes leaf spot or early blight. 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. How to Treat Fungus on a Houseplant. 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