Bacterial Wilt on Marigolds
Distribution and Host Range
Southern bacterial wilt, caused by Pseudomonas solanacearum, is a widespread and destructive disease of numerous crops in the warm climates of the world. It is a major disease of tobacco, tomato, potato, dahlia, geranium, hollyhock, hydrangea, marigold, nasturtium, zinnia and others. Bacterial wilt is the most frequent disease problem of marigolds in North Carolina landscapes.
plants may become stunted with foliage light green to chlorotic (yellow)
or grey green in color. The upper foliage may wilt slightly in the early
stages of the disease but the plant rapidly wilts completely. Diseased
plants often die within 7-14 days after the first symptoms are observed.
Southern bacterial wilt is a difficult disease to control. There are no chemicals that provide effective control before or after planting.
control is to avoid susceptible plants or to grow resistant cultivars.
The following marigold cultivars are resistant to bacterial wilt: Cupid;
Irish Lace; Papaya Crush; Pineapple Crush; Pumpkin Crush; Rusty Red; Sparky;
Sparky Mix; Bonanza Yellow; Choice Mix; Copper Canyou; Cupid Mix; Fort
Knox; Golden Harmony; Goldie; Gypsy Dancer; Naughty Marietta; Orange Lady;
Senator Dirksen; and Tangerine Gem. If it is necessary to grow a susceptible
cultivar in an area where the disease has been a problem in the past,
plant the susceptible cultivar in another part of the area or plant them
in new soil or a soil-less media in planter boxes.
For assistance with a specific problem, contact your local North Carolina Cooperative Extension Service personnel.
Distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914. Employment and program opportunities are offered to all people regardless of race, color, national origin, sex, age, or disability. North Carolina State University at Raleigh, North Carolina A&T State University, U.S. Department of Agriculture, and local governments cooperating.
to information: March 1996