BOLO September
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Collapse ▲Month-by-month lists of common plant diseases, pests, and other problems you may encounter in North Carolina yards and gardens.
Back to BOLO list of months.
Turfgrasses
Brown patch (fescue/ryegrass)
Fairy ring (all turfgrasses)
Gray leaf spot (fescue/St. Augustinegrass)
Large patch (bermudagrass/zoysiagrass/centipedegrass/St. Augustinegrass)
Leaf spot caused by Bipolaris/Drechslera (bluegrasses/bermudagrass)
Red thread (Kentucky bluegrass/fescue/ryegrass)
Rust (Kentucky bluegrass/fescue/St. Augustinegrass/zoysiagrass)
Summer Patch (Kentucky bluegrass/fine fescue)
Chinch bugs (St. Augustinegrass)
Woody Ornamentals
General: Nuisance fungi in landscape beds
Multiple hosts: Phytophthora root rot, Armillaria root rot (sometimes producing mushrooms this time of year), conks of wood decay fungi such as Pseudoinonotus dryadeus (a.k.a. the weeping polypore), Botryosphaeria dieback, sooty mold, improper planting, overfertilization
Multiple shrub species: root-knot nematodes
Arborvitae: Phytophthora root rot, Armillaria root rot
Azalea: Phytophthora root rot, Armillaria root rot, Phomopsis dieback, stunt nematode, Azalea prominent caterpillars (Datana major; large caterpillars)
Boxwood: Phytophthora root rot, boxwood blight, boxwood stem canker (Colletotrichum theobromicola), nematodes (lesion, root-knot, spiral)
Cherry, flowering: shothole (Passalora) and leaf blight (Blumeriella) resulting in defoliation (at least shot-hole does … check on Blumeriella)
Cherry-laurel: shot-hole, Botryosphaeria canker/dieback
Dogwood, flowering: powdery mildew, scorch (heat/drought), Septoria leaf spot
English Ivy: anthracnose, bacterial leaf spot, Phytophthora root rot
Euonymus: powdery mildew
Hemlock: Rosellinia needle blight
Hydrangea: Cercospora leaf spot, Corynespora leaf spot
Indian hawthorn: Entomosporium leaf spot
Japanese black pine: pine wilt nematode
Japanese holly: black root rot, Armillaria root rot, Botryosphaeria canker/dieback
Junipers: Phytophthora root rot (except Eastern red cedar), Armillaria root rot
Leucothoë: powdery mildew – note red spots on top of infected leaves
Leyland cypress: Phytophthora root rot, Armillaria root rot, Cypress (Seiridium) canker, Botryosphaeria canker/dieback, Passalora needle blight, algae on foliage, internal browning
Loropetalum: bacterial gall (knot), Cercospora (Pseudocercospora) leaf spot
Magnolia, saucer: powdery mildew
Magnolia, Southern: algal leaf spot
Maple: anthracnose, Phyllosticta leaf spot
Oaks: bacterial leaf scorch, anthracnose (Discula, Apiognomonia), Tubakia leaf spot, secondary leaf spots, slime flux, Biscogniauxia canker, weeping polypore (Pseudoinonotus dryadeus)
*slime flux is mainly seen on oak but can occur on maple, elm, hickory, and some other hardwoods
Redbud: Cercospora (Passalora) leaf spot, bacterial leaf scorch
Red-tip photinia: Entomosporium leaf spot
Rose: Armillaria root rot, crown gall, black spot, Cercospora (Rosisphaerella) leaf spot, rose rosette
Spruce: Rhizosphaera needle cast
Sycamore: bacterial leaf scorch, anthracnose
Willow: Pseudocercospora leaf spot
Herbaceous Ornamentals (Perennials, Bedding Plants)
Multiple hosts: Rhizoctonia root/stem/crown rot, root-knot nematode, normal late-summer senescence of some perennials
Amsonia: rust
Aster: rust
Coreopsis: powdery mildew
Impatiens: Rhizoctonia crown/stem blight, downy mildew*
*New Guinea impatiens are not susceptible to downy mildew
Ironweed: powdery mildew, rust
Liriope: anthracnose on leaf tips, Fusarium crown rot
Peony: leaf blotch (measles)
Rudbeckia: Septoria leaf spot
Vernonia: rust
Vinca, annual (Catharanthus): Phytophthora root rot and aerial blight
Zinnia: powdery mildew, Alternaria leaf spot (also on petals), bacterial leaf spot (also on petals)
Fruits & Nuts
Multiple hosts: drought stress
Apple: bitter rot, sooty blotch and flyspeck, black rot
Blueberry: Phytophthora root rot
Grape, bunch: Pierce’s disease
Grape, muscadine: Pierce’s disease
Peach: brown rot (fruit phase)
Pear: Fabraea leaf spot
Pecan: scab, powdery mildew
Vegetables & Herbs
Basil: downy mildew
Beans: anthracnose, Cercospora leaf spot, Rhizoctonia root/stem rot
Cole crops: Black rot, Rhizoctonia damping off
Cucurbits: downy mildew, powdery mildew, fruit rots
Tomato: late blight, Septoria leaf spot, gray leaf spot, growth cracks
Arthropods of the General Landscape
Cicada killers (females may be nesting)
Wheel bugs (adults)
Two-lined spittlebug (adults; often on hollies)
Soldier beetle larvae (Cantharidae)
Arthropods Associated with Multiple Plants
Fall webworms
Bagworms (Thyridopteryx ephemeraeformis; bags often containing eggs)