A COMPENDIUM OF TROPICAL PLANT DISEASES AND DISORDERS
BACTERIAL WILT (SOUTHERN WILT)
SYMPTOMS
Yellowing and browning of the lower leaves
Drooping of the tip of some of the lower leaves that resembles lack of water
Southern wilt is caused by the bacterial plant pathogen Ralstonia solanacearum . Ralstonia solancearum is divided into several different races and biovars. A biovar 3 strain of R. solancearum can infect and cause disease of Mandevilla, Geranium and Osteospermum. Vinca vine (V. minor) and Sutera were asymptomatic hosts. The biovar 3 strain is distinct from the strain classified as a select agent (race 3, biovar 2). The strict regulatory guidelines associated with the presence of race 3 biovar 2 do not apply to biovar 3.
Leaf petiole and lower leaf turn brown in between the veins
Roots of infected plants often appear healthy
FAVORABLE CONDITIONS
Disease is primarily spread from infected cuttings
Favors temperatures of 86 and higher
Overhead irrigation
GERANIUM- RALSTONIA
RALSTONIA MANDEVILLA
RALSTONIA MANDEVILLA
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BACTERIAL WILT OF PANICLE HYDRANGEA
CORDYLINE BIPOLARIS
BACTERIAL STREAMING
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