· Crown canker is a fungal disease that attacks flowering dogwood trees. The disease, also known as collar rot, can kill the trees leave them vulnerable to lethal attack by other pathogens. Crown canker is a common disease that can affect dogwood trees. It’s caused by the fungus Phytophthora cactorum, which infects the crown of the tree, leading to the development of a canker. View all Crown Canker, also known as Collar Rot of dogwood is caused by the pathogen Phytophthora cactorum. The pathogen causes injury to flowering dogwood (Cornus florida) and may kill the affected tree or weaken the tree and make it more susceptible to attack by other organisms. Dogwood diseases come in many different forms, and Armillaria root rot, caused by fungi in the Armillariagenus, is a particularly nasty one. After the onset of infection, disease symptoms manifest themselves all over the plant. Afflicted leaves turn yellow, are smaller than normal, and prematurely drop. Branches die back, light fungal threads lie b...See full list on gardenerspath.comCaused by various fungal species within the Botrytis genus, Botrytis blight afflicts dogwoods and an assortment of species from other genera, such as begonias, chrysanthemums, and tulips. Overwintering in dead plant debris, the causal fungi form spores in springtime, which spread via air currents and/or splashed water onto flower bracts and leaves....See full list on gardenerspath.comThe trademark symptom of this disease is in the name: a discolored, oozing canker at the tree’s crown near the soil line. In time, the canker becomes more and more sunken and exposed as the bark falls away, and can girdle the trunk or root crown. Eventually, the tree can weaken, become susceptible to other pathogens, and even perish. But before all...See full list on gardenerspath.comPortobello mushrooms, hallucinogenic ‘shrooms, the red and green mushrooms from “Super Mario Bros.,” – there are plenty of famous fungi out there. To take a closer look at a rather infamous one, let’s turn our attention to the Discula destructivafungus. Discula anthracnose, or dogwood anthracnose, both names for the sickness caused by this fungus, ...See full list on gardenerspath.comCaused by Erysiphe pulchra or Phyllactinia guttata, powdery mildew is a fungal disease that leaves foliage and tender new growth coated with a fine white powder. It typically occurs during summer and fall in spots where air circulation is poor. Secondary symptoms include chlorosis, reddish discoloration, marginal leaf scorch, premature defoliation,...See full list on gardenerspath.comAs if one type of anthracnose wasn’t bad enough… Elsinoe corniis the fungus to blame for this one. Surviving for years on infected tissues, the pathogen primarily strikes in wet spring conditions, leaving flower bracts, leaves, and fruits with tan spots ringed with reddish-purple. In severe infections, afflicted structures can become wrinkled and w...See full list on gardenerspath.comSep 2, 2025 · A fungus called Phytophthora cactorum causes crown canker (also called collar rot) when it enters a tree through a wound. Just as an open wound on your skin can become infected, so can cuts and scrapes on the trunk or branches of a tree. Early symptoms include smaller, paler leaves than usual. · Crown canker (also known as “collar rot,” caused by Phytophthora cactorum) can cause injury or death in flowering dogwood (B. florida) and other susceptible dogwood species. It is usually only cosmetic. Crown canker, Phytophthora cactorum, is the most serious disease of flowering dogwoods in the Eastern United States. Leaves are small or undersized and of a lighter green color and may curl. The plant appears stressed especially during dry periods. Crown canker is a common disease that can affect dogwood trees. It’s caused by the fungus Phytophthora cactorum, which infects the crown of the tree, leading to the development of a canker. Crown Canker, also known as Collar Rot of dogwood is caused by the pathogen Phytophthora cactorum. The pathogen causes injury to flowering dogwood (Cornus florida) and may kill the affected tree or weaken the tree and make it more susceptible to attack by other organisms. Dogwood diseases come in many different forms, and Armillaria root rot, caused by fungi in the Armillariagenus, is a particularly nasty one. After the onset of infection, disease symptoms manifest themselves all over the plant. Afflicted leaves turn yellow, are smaller than normal, and prematurely drop. Branches die back, light fungal threads lie b...See full list on gardenerspath.comCaused by various fungal species within the Botrytis genus, Botrytis blight afflicts dogwoods and an assortment of species from other genera, such as begonias, chrysanthemums, and tulips. Overwintering in dead plant debris, the causal fungi form spores in springtime, which spread via air currents and/or splashed water onto flower bracts and leaves....See full list on gardenerspath.comThe trademark symptom of this disease is in the name: a discolored, oozing canker at the tree’s crown near the soil line. In time, the canker becomes more and more sunken and exposed as the bark falls away, and can girdle the trunk or root crown. Eventually, the tree can weaken, become susceptible to other pathogens, and even perish. But before all...See full list on gardenerspath.comPortobello mushrooms, hallucinogenic ‘shrooms, the red and green mushrooms from “Super Mario Bros.,” – there are plenty of famous fungi out there. To take a closer look at a rather infamous one, let’s turn our attention to the Discula destructivafungus. Discula anthracnose, or dogwood anthracnose, both names for the sickness caused by this fungus, ...See full list on gardenerspath.comCaused by Erysiphe pulchra or Phyllactinia guttata, powdery mildew is a fungal disease that leaves foliage and tender new growth coated with a fine white powder. It typically occurs during summer and fall in spots where air circulation is poor. Secondary symptoms include chlorosis, reddish discoloration, marginal leaf scorch, premature defoliation,...See full list on gardenerspath.comAs if one type of anthracnose wasn’t bad enough… Elsinoe corniis the fungus to blame for this one. Surviving for years on infected tissues, the pathogen primarily strikes in wet spring conditions, leaving flower bracts, leaves, and fruits with tan spots ringed with reddish-purple. In severe infections, afflicted structures can become wrinkled and w...See full list on gardenerspath.comSep 2, 2025 · A fungus called Phytophthora cactorum causes crown canker (also called collar rot) when it enters a tree through a wound. Just as an open wound on your skin can become infected, so can cuts and scrapes on the trunk or branches of a tree. Early symptoms include smaller, paler leaves than usual. · Crown canker (also known as “collar rot,” caused by Phytophthora cactorum) can cause injury or death in flowering dogwood (B. florida) and other susceptible dogwood species. It is usually only cosmetic. Crown canker, Phytophthora cactorum, is the most serious disease of flowering dogwoods in the Eastern United States. Leaves are small or undersized and of a lighter green color and may curl. The plant appears stressed especially during dry periods. · A fungus called Phytophthora cactorum causes crown canker (also called collar rot) when it enters a tree through a wound. Just as an open wound on your skin can become infected, so can cuts and scrapes on the trunk or branches of a tree. Early symptoms include smaller, paler leaves than usual. · Crown canker (also known as “collar rot,” caused by Phytophthora cactorum) can cause injury or death in flowering dogwood (B. florida) and other susceptible dogwood species. It is usually only cosmetic. Crown canker, Phytophthora cactorum, is the most serious disease of flowering dogwoods in the Eastern United States. Leaves are small or undersized and of a lighter green color and may curl. The plant appears stressed especially during dry periods.
