begonia leaf disease
Begonia luxurians is literally the trippiest Begonia variety in my garden. Vine weevil. Begonias are susceptible to several diseases. Wedge-shaped chlorotic areas are an initial symptom, but this discoloration is subtle and easily overlooked (Figure 2A). Botrytis of begonia is also known as botrytis blight. The resulting grubs burrow into the tuber, munching away and causing irreparable damage. Treating Begonia Bacterial Leaf Spot. Bacterial leaf spots first appear as small, blister-like growths on the underside of leaves near the main veins. All Rights Reserved. Root and stem rot caused by a Pythium fungus and other pathogens may appear as water-soaked or discolored stems near the soil line, small and discolored root systems, stunted growth and sometimes plant death. Bacterial blight (Xanthomonas axonopodis pv. Some fungi live in the soil and cause root and stem rots in tuberous begonias. When the disease spreads through the entire plant, the begonia may collapse and die. They often leave black tar-like spots of excrement on the underside of the spots. A fungus (Erysiphe cichoracearum) causes powdery, white spots to form on both lower and upper leaf surfaces. Multiple fungal pathogens can cause powdery mildew on begonias. Xanthomonas campestris pv. A begonia plant can be seriously injured even by a mild infection. Symptoms often aren’t noticed until necrosis begins at the leaf margin. Begonia spp. Angela Ryczkowski is a professional writer who has served as a greenhouse manager and certified wildland firefighter. OSU Plant Clinic Image, 2013. Once any signs of a begonia disease appear on a plant, the owner should remove the affected begonia and quarantine it from other plants. Here are a couple of possible explanations for your leaf damage. The infected begonia plant typically develops a gray, fuzzy mold as the blight progresses. Cause Xanthomonas axonopodis pv. Affected areas are eventually covered by indicative masses of fuzzy gray growth. Root and Stem Rot. Begonias grow well in partially shaded, humid areas with moderate temperatures. Discard infected plants; particularly Rieger-types which are systemically infected. This is a dangerous plant disease. Spotted leaves must be carefully removed and burned. Causal pathogens spread via insects or on contaminated soil, tools or seeds. Begonias are tropical plants known for their waxy flowers and varicolored leaves. Begonia plants should never be placed in direct sunlight because they can’t tolerate high temperatures very well. Avoid overwatering begonias, promptly remove infected plants and do not plant begonias where rots have created problems in the past without first chemically treating, steaming or solarizing the soil. The begonia appears wilted but doesn’t recover after being watered. Begonias are tropical plants known for their waxy flowers and varicolored leaves. Bacterial leaf spot or blight of begonia is one of the most widespread begonia diseases and is caused by Xanthomonas campestris pv. Although most begonias are grown indoors, these plants also work well as outdoor ornamentals. Fungi responsible for this condition may be introduced on cuttings or be present in soil. Leaves develop small spots with yellow halos. Infected stems and leaf petioles develop water-soaked streaks and often split. Host and Disease Descriptions; Begonia-Leaf Spot. Space plants well to maintain low humidity and good air circulation and avoid overhead irrigation or splashing water on or around the begonias. Mist well with water and place the container in a plastic bag. In advanced stages, the disease causes systemic infection and plant wilting. Plan the perfect garden with our interactive tool →. Bacterial leaf spot is one of the most common diseases affecting all varieties of begonias.
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