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BOLO August

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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 (tall fescue/ryegrass)

Fairy ring (all turfgrasses)

Gray leaf spot (fescue/St. Augustinegrass)

Large patch (bermudagrass, centipedegrass, seashore paspalum, St. Augustinegrass, zoysiagrass)

Pythium blight (fescue/Kentucky bluegrass/ryegrass)

Summer Patch (Kentucky bluegrass/fine fescue)

Chinch bugs (St. Augustinegrass)

Woody Ornamentals

General: Slime mold and nuisance fungi in landscape beds

Multiple hosts: Phytophthora root rot, Armillaria root rot, Botryosphaeria dieback, sooty mold, herbicide injury, heat/drought stress, 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)

Camellia: Glomerella canker, Phytophthora root rot

Cherry, flowering: shothole (Passalora) and leaf blight (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

Gardenia: Phytophthora root rot

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, Phomopsis tip blight

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, algae on foliage, internal browning

Loropetalum: bacterial gall (knot)

Magnolia, saucer: powdery mildew

Magnolia, Southern: algal leaf spot

Maple: anthracnose, Phyllosticta leaf spot

Oaks: bacterial leaf scorch, anthracnose (Discula, Apiognomonia), Tubakia leaf spot, slime flux (mainly on oak but can occur on maple, elm, hickory, and some other hardwoods)

Pine, white: ozone injury

Redbud: Cercospora (Passalora) leaf spot, bacterial leaf scorch

Red-tip photinia: Entomosporium leaf spot 

Rhododendron: Botryosphaeria canker/dieback

Rose: Armillaria root rot, crown gall, black spot, rose rosette

Spruce: Rhizosphaera needle cast

Sycamore: scorch from heat/drought, bacterial leaf scorch, anthracnose

Tulip (yellow) poplar: powdery mildew, premature fall color due to drought

Herbaceous Ornamentals (Perennials, Bedding Plants)

Multiple hosts: Rhizoctonia root/stem/crown rot, Southern stem blight (Sclerotium rolfsii), root-knot nematodes, normal late-summer senescence of some perennials

Amsonia: rust

Aster: rust

Begonia: Pythium root rot, root-knot nematode

Coral bells (Heuchera): Phytophthora root/crown rot

Coreopsis: powdery mildew

Liriope: anthracnose on leaf tips, Fusarium crown rot

Impatiens: Rhizoctonia crown/stem blight, downy mildew*, root-knot nematode
*New Guinea impatiens are not susceptible to downy mildew

Iris: Heterosporium (Cladosporium) leaf spot, bacterial soft rot

Ironweed: Powdery mildew

Pachysandra: Volutella blight

Peony: leaf blotch (measles)

Petunia: Phytophthora crown/stem rot, Rhizoctonia stem rot

Rudbeckia: Septoria leaf spot, downy mildew

Vernonia: rust

Vinca, annual (Catharanthus): Phytophthora root rot and aerial blight, Rhizoctonia aerial blight

Zinnia: powdery mildew, Alternaria leaf (and petal) spot, bacterial leaf (and petal) spot

Fruits & Nuts

Multiple hosts: Herbicide injury, drought stress

Apple: cedar-apple rust, Marssonina leaf blotch, bitter rot, sooty blotch and flyspeck

Blackberry: cane blight

Blueberry: Botryosphaeria stem blight, Phytophthora root rot

Grape, bunch: downy mildew, anthracnose, black rot (fruit), Pierce’s disease, herbicide injury

Grape, muscadine: black rot (leaves), Pierce’s disease, herbicide injury

Peach: scab, brown rot (fruit phase)

Pear: Fabraea leaf spot

Pecan: scab

Vegetables & Herbs

Multiple hosts: Southern stem blight (Sclerotium rolfsii), root-knot nematodes, nutrient deficiencies

Basil: downy mildew

Beans: anthracnose, Cercospora leaf spot, Rhizoctonia root/stem rot

Cucurbits: downy mildew, powdery mildew (esp. squash, pumpkin), anthracnose, Fusarium wilt, gummy stem blight (esp. watermelon), root-knot nematode, ozone injury (esp. watermelon)

Pepper: bacterial spot, blossom-end rot

Thyme: Rhizoctonia aerial blight

Tomato: bacterial wilt, bacterial spot, Septoria leaf spot, Fusarium wilt (esp. heirloom varieties), early blight, late blight, gray leaf spot, root-knot nematode, blossom-end rot, growth cracks

Arthropods of the General Landscape

Cicada killers (males guarding territories, females nesting)

Wheel bugs (adults)

Green June beetles (Cotinis nitida; may attack ripe fruit)

Two-lined spittlebug (adults; often on hollies)

Arthropods Associated with Multiple Plants

Fall webworms

Japanese beetle (particularly roses and grapes)