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Boxwood Blight Image Gallery

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Symptom: Defoliation on boxwood in the planter and on the mature plants in the foreground; Photo Credit: A. Bordas smaller-new boxwood in pot Symptom: Defoliation on mature plants; Photo Credit: A. Bordas Symptom: Close-up of leaf spots; note light center and dark border.; Photo Credit: A. Bordas Symptom: Leaf drop on nursery stock; Photo Credit: A. Bordas Leaf spots; Photo Credit: M.A. Hansen Symptom: Black streaking on stems; Photo Credit: M.A. Hansen Symptom: Defoliation on mature landscape plants located across the road from infected nursery plants; Photo Credit: M.A. Hansen Symptom: Defoliation on mature landscape plants located across the road from infected nursery plants; Photo Credit: M.A. Hansen Symptom: Leaf browning and defoliation of infected nursery plants; Photo Credit: M.A. Hansen Symptom: Leaf browning and defoliation of infected nursery plants; Photo Credit: M.A. Hansen Symptom: Defoliation on mature plants; Photo Credit: M.A. Hansen Symptom: Refoliation of infected stems following defoliation due to boxwood blight; Photo Credit: M.A. Hansen The three main symptoms of boxwood blight: leaf spots, black streaking on stems and defoliation; Photo Credit: N. Dart Symptom: Infected leaf and stem debris on ground; Photo Credit: M.A. Hansen Vesicles and conidia of Calonectria pseudonaviculata, the causal agent of boxwood blight; Photo Credit: E. Bush Microsclerotia (stained blue) of the boxwood blight fungus in leaf tissue; Photo Credit: E. Bush Signature Programs: White stellate clusters of Calonectria pseudonaviculata, the boxwood blight pathogen, on a boxwood branch; Photo Credit: E. Bush Sign: look-alike pathogen: Salmon-colored spore masses of the Volutella blight fungus on a boxwood branch (spore masses are initially white, then turn salmon-colored as they mature); Photo Credit: E. Bush Sign: look-alike pathogen: Salmon-colored spore masses of the Volutella blight fungus on boxwood (spore masses are initially white, then turn salmon-colored as they mature); Photo Credit: E. Bush Spore masses of Pseudonectria buxi (Pb), causal agent of Volutella blight, and spore masses of the boxwood blight fungus, Calonectria pseudonaviculata (Cp), on a boxwood branch; Photo Credit: E. Bush Sign: look-alike pathogen: White spore masses of the Volutella blight pathogen (Pseudonectria buxi) on the underside of a boxwood leaf (later spore masses will turn salmon-colored); Photo Credit: E. Bush Diagram showing flow of nursery stock. Plants should be held for 30-day quarantine period before releasing into production areas of nurseries.; Photo Credit: N. Dart Store boxwood plants on easy-to-clean surface, such as weed mat over well drained gravel.; Photo Credit: N. Dart Clean and sanitize boots between hoop houses and productions fields. ; Photo Credit: N. Dart Take steps to reduce leaf wetness on boxwood at all stages of production.; Photo Credit: N. Dart Use drip irrigation to reduce leaf wetness period whenever possible.; Photo Credit: N. Dart Scout host plants frequently for signs and symptoms of boxwood blight .; Photo Credit: N. Dart Infected plants should be bagged to contain leaf debris; Photo Credit: N. Dart Residual leaf debris can be eradicated by burning with an agricultural flamer; Photo Credit: B. Kreowski Nursery BMP: Removal of infected boxwoods in a nursery; Photo Credit: M.A. Hansen Nursery BMP: Removal of infected boxwoods in a tipping operation; Photo Credit: M.A. Hansen