Disease Problems to Watch Out for in March



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

Tobacco - Bacterial soft rot, Cold injury, Collar rot, Fertilizer injury, Pythium damping-off, Rhizoctonia damping-off, Target spot
For more information, see the disease chapters in the production guides for flue-cured and burley tobacco.

 Forages

Alfalfa - Leptosphaerulina leaf spot, Sclerotinia crown rot

 Small Grains

General Problems - Cold injury, Nutritional problems
Barley - Barley yellow dwarf
Oats - Barley yellow dwarf
Wheat - Barley yellow dwarf, Powdery mildew, Septoria leaf blotch, Soilborne wheat mosaic, Wheat spindle streak, Wheat streak mosaic

 Turfgrasses

General turf samples - Brown patch, Cold injury, Fairy ring, Nutritional problems, Pink snow mold (TurfFiles Publications)

 Woody Ornamentals

General shrubs - Cold injury to stems (bark loose & peeling near soil line), Frost damage to blooms and new growth, Edema, Normal decline of senescent leaves on broadleaf evergreens (secondary leafspots)
Azalea - Phomopsis dieback, Phytophthora root rot, Stunt nematodes
Boxwood, Common - Lesion nematodes, Phytophthora root rot
Camellia - Algal leaf spot, Bullnose (bloom failure), Canker, Phytophthora root rot
Cherrylaurel - Bacterial leaf spot
Cypress, Leyland - Cypress canker
Hawthorn, Indian - Entomosporium leafspot
Holly, Japanese - Black root rot, Dagger, ring and root-knot nematodes
Juniper - Low pH, Phytophthora root rot
Leucothoe - Powdery mildew
Magnolia, Southern - Algal leaf spot
Photinia - Entomosporium leaf spot
Redcedar, Eastern - Cedar-apple rust
Rhododendron - Botryosphaeria dieback, Botrytis dieback (begins in old flowers), Phytophthora root rot, Stunt nematodes
Rose - Botrytis cane blight, Downy mildew, Rose Mosaic

 Herbaceous Ornamentals

Greenhouse bedding plants/perennials - Botrytis diseases, Pythium root rot, Rhizoctonia diseases (Web blight, root/stem rot), Sclerotinia stem rot, Impatiens necrotic spot virus
English Ivy - Anthracnose, Edema
Liriope - Anthracnose and secondary leafspots on last year's foliage
Pansy - Black root rot, Botrytis blight, Cold injury, Pythium root rot
Madagascar periwinkle - Botrytis blight, Phytophthora blight
Snapdragon - Downy mildew

 Interior

Geranium - Botrytis blight, Nutritional problem, Pythium root rot
Ivy geranium - Edema

 Fruits

Apple - Burr knot, Fire blight
Peach - Short life complex
Blackberry - Cane and leaf rust
Strawberry - Angular leafspot (Xanthomonas), Anthracnose, Botrytis blight, Common leafspot, Phomopsis leaf blight
For more information on tree fruits see
FDIN-002 Disease and Insect Management in the Home Orchard

 Herbs

Lavender - Phytophthora root rot
Rosemary - Pythium root rot, Rhizoctonia root rot

 Vegetables

Cabbage - Downy mildew
Cucumber - Anthracnose
Onion - Botrytis blight
Pepper - Bacterial spot, Botrytis blight, Pythium root rot, Rhizoctonia damping-off, Sclerotinia stem rot
Tomato (greenhouse) - Blossom-end rot, Early blight, Pith necrosis, Sclerotinia stem rot, Southern bacterial wilt, Tobacco mosaic

Other Links

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

Last modified on November 2000