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NC State Extension

BOLO August

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.


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

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

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, 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)

Written By

Mike Munster, N.C. Cooperative ExtensionMike MunsterPlant Disease Diagnostician for Commercial Ornamentals Call Mike E-mail Mike Entomology & Plant Pathology
NC State Extension, NC State University
Page Last Updated: 4 months ago
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