It starts on the flowers, and they can look like they have a gray film on them. The first signs of the disease are spots on leaves that turn brown and begin to rot. (Click on photo to enlarge) Diseases. Most leaf spot diseases affect only a small percentage of the tree's overall leaf area, and are a minor stress on the health of the tree. The pictures are a little small, but I think the problem might be a fungal disease called gray mold (Botrytis). Identification tip: Leaf mottling or yellowing, spotting on the underside of leaves, and premature leaf drop can occur from excess boron; severe symptoms can include twig dieback. This disease can strike at any time throughout the year, especially when the temperature ranges between 60 and 75°F. It is extremely common, and it will eventually rot the entire plant, including the fruit. Photo credit: Wikimedia Commons When you see little sunken areas starting to appear in your tomato’s leaves, you’ll know they have a case of anthracnose.This fungal pathogen is one of the most common tomato plant diseases, and is caused by Colletotrichum phomoides fungus. Leaf spot diseases should be taken seriously if they result in moderate to complete leaf loss two to four years in a row. Anthracnose is a common disease among deciduous trees, especially sycamore, ash and oak. Diseases of grape leaves. Hail damage Identification tip: Small scars on twigs or fruit all occur on the upper or outer exposed side of branches injured by hail. Leaf galls look like It causes unsightly dark, sunken lesions on leaves, stems, flowers and fruits. They are responsible for a great deal of damage and are characterized by wilting, scabs, moldy coatings, rusts, blotches and rotted tissue. Rainy conditions and overly fertilized vineyards can cause the botrytis to appear. Below are common diseases affecting petunia plants: Root, Stem and Crown Rots – Root, stem, and crown rots commonly affect petunias planted in areas of poor drainage or that are chronically over watered. Does that fit with the symptoms? This page is designed to help identify some of the more common plant diseases and provides earth-friendly solutions (see organic fungicides) for combating them. Anthracnose fungi need water to spread and infect, so the disease is more prevalent during wet, cold springs. ), here is important and time-sensitive information from Victor Shaul of the WSDA Seed Program on proposed amendments to … Revus Top is not currently registered for sale or use in all states. caused by a parasite or insect, bites, living within the vines. Leaf spot diseases weaken trees and shrubs by interrupting photosynthesis. Does not affect grapes. Diseases of grape leaves. It also affects shrubs such as privet. Leaves wilt despite regular watering and stems may begin to soften. There are diverse symptoms that manifest orchid diseases ().When these symptoms are detected, we have several treatments available for these diseases that have fungal, bacterial, and viral origins ().In some cases, however, we should dispose of some leaves and furthermore, discard root rots (), and replant the orchid (). DISEASES Leaf Unfolded Leaf Development Early Flowering Fruit Set/Swell Fruit Development Veraison Preharvest EASTERN GRAPES Powdery mildew Downy mildew Black rot Inspire Super and Quadris Top are not currently registered for sale or use on grapes in all states. The leaves then die, dry, and fall off the vine. Petunia Diseases. That disease also spreads to the leaves… For those of you who work with bean crops of any kind (oilseed, cover, processing, fresh market, seed, forage, etc. Tips On Treating Orchid Diseases. Spread and infect, so the disease are spots on leaves that brown. It causes unsightly dark, sunken lesions on leaves, stems, flowers and.. 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