Plant Problems to Watch for in June


Here are some diseases we observed in the clinic during the month of June. The hypertext links will lead you to specific information about a certain disease or about diseases in a certain crop.


Field Crops
Corn Anthracnose, Bacterial stalk rot, Common maize rust, Nematodes, Nutritional problems, Maize chlorotic dwarf virus
Cotton Ascochyta blight, Bacterial blight, Damping-off (Rhizoctonia, Pythium, Fusarium)
Peanut CBR, Early leaf spot, Southern blight (Sclerotium rolfsii), TSWV
Soybean Brown spot, Cyst nematodes, Damping-off, Southern blight
Tobacco Black shank, Blue mold, Chemical and/or Fertilizer injury, Granville wilt,
Root-knot nematodes, Viruses (TMV, TSWV, PVY, Etch, Ringspot), Sore shin,
Southern blight, Weather fleck

Forages/Small Grains
Alfalfa Crown/root rots (various fungi)
Wheat Take-all, Bacterial blight

Turfgrasses (Full listing of TurfFiles Publications)
Bentgrass Fairy ring, Pythium diseases
Bermudagrass Hydrophobic soils, Nutritional problems, Spring dead spot
Centipedegrass Brown patch, Cold injury, Drought/Hydrophobic soils, Ground
pearls
Fescue Brown patch, Drought, Normal senescence of annual ryegrass
St. Augustinegrass Gray leaf spot
Zoysiagrass Brown patch, Dollar spot

Woody Ornamentals
General on several hosts Air pollution injury, Fertilizer injury, Low pH, Phytophthora root rot, Powdery mildew, Web blight (Rhizoctonia)
Azalea Stunt nematodes, Phomopsis dieback
Boxwood Lesion nematode (nematode information for the nursery and landscape), Fertilizer injury
Camellia Canker
Cotoneaster, Pyracantha Fire blight
Crabapple Fire blight, Apple scab, Quince rust
Leyland cypress Cypress canker (Seiridium), Botryosphaeria dieback/canker
Dogwood Dogwood anthracnose (Discula), Powdery mildew, Spot anthracnose,
Stress/Problem lower down
Elm Black spot, Dutch elm disease
Holly Black root rot, Mushroom root rot, Nematodes (Dagger, Ring, Root-knot)
Juniper Decline caused by combinations of the following: Excess shade, Low pH, Magnesium deficiency, Phytophthora root rot, Poor drainage, Spider mites
Maple Anthracnose, Phyllosticta leaf spot
Oak Leaf blister (leaf curl)
Photina Entomosporium leaf spot, Mushroom root rot
Redcedar, Eastern Phomopsis twig blight, Kabatina twig blight
Rhododendron Botryosphaeria dieback, Botrytis dieback
Rose Cane blights, Downy mildew, Powdery mildew, Rose mosaic virus,
Round-up injury

Herbaceous Ornamentals
General on several hosts Chemical injury, Fertilizer injury, Low pH, Phytophthora root/stem rot, Pythium root rot, Rhizoctonia root/stem rot, Southern blight (Sclerotium rolfsii). See also information on damping-off
Clematis Phomopsis or Aschochyta stem rot
Coralbells Black root rot, Phytophthora root rot, Web blight
Hollyhock Rust
Impatiens INSV, Rhizoctonia root/stem rot
Ivy, English Bacterial leaf spot, Anthracnose
Pachysandra Volutella blight
Pansy Heat stress (time to replace with summer annuals)
Periwinkle, Common Phoma blight, Rhizoctonia blight
Periwinkle, Madagascar Phytophthora blight
Snapdragon Rust, Phytophthora blight, Heat stress
Zinnia Bacterial leaf spot, Powdery mildew
Zygocactus Fusarium stem rot

Interior Plants
General Pythium root rot, Fertilizer injury, Anthracnose, Nutritional problems

Fruits/Nuts
Apple Cedar-apple rust, Fire blight, Frog-eye leaf spot, Scab
Stone fruits Brown rot, Nematodes, Peach leaf curl, Powdery mildew (rusty
spot on peach), Short life complex
Blueberry Stem blight, Phytophthora root rot
Grape Anthracnose, Botrytis blight, Downy mildew
Pecan Scab
Raspberry/Blackberry Rust diseases
Strawberry Angular leaf spot, Anthracnose, Black root rot complex, Common leaf spot, Multiplier disease (Phytoplasma)

Vegetables/Herbs
General Damping off (Rhizoctonia, Pythium, Fusarium), Fertilizer injury, Nutritional problems, Rhizoctonia root/stem rot, Southern blight
Bean Anthracnose, Rhizoctonia/Fusarium damping-off
Crucifers Alternaria leaf spot, Club root, Sclerotinia diseases
Cucurbits Anthracnose, Bacterial wilt, Choanephora fruit rot, Fusarium wilt, Gummy stem blight, Nematodes, Phytophthora root/crown rot, Sclerotinia stem rot, Viruses
See also Cantaloupe diseases
Ginseng Anthracnose, Phytophthora root rot
Pepper Bacterial spot, Blossom-end rot, Phytophthora stem rot, Rhizoctonia root/stem rot
Potato Air pollution, Black leg, Early blight, Late blight, Seed piece decay, Viruses
Tomato Bacterial spot, Blossom-end rot, Early blight, Pith necrosis, Late blight, Southern bacterial wilt, TSWV, Stemphylium gray leaf spot, Septoria leaf spot, Tobacco mosaic virus

Other Links

Plant Clinic Summaries
Plant Disease Information Notes
Plant Disease and Insect Clinic

Last modified November 2000