Name and publication
Phytophthora acaciae A.F. dos Santos, T.C.A. Alves, D.J. Tessmann, K.L. Ivors & J.B. Ristaino (2019)
Alves TC, Tessmann DJ, Ivors KL, Ristaino JB, Dos Santos ÁF. 2019. Phytophthora acaciae sp. nov., a new species causing gummosis of black wattle in Brazil. Mycologia 4 111 (3): 445–455.
“acaciae” referring to the genus of the host plant
Type: BRAZIL, Rio Grande Do Sul, Triunfo, 29°54′21.34″S, 51°42′27.05″W, 36 m alt, dried culture isolated from black wattle trunk, 12 Nov 1999, A. F. Santos, holotype MBM 415188.
Ex-type: culture AN02
Sequences for ex-type in original manuscript: ITS KX396303, cox1 KX396267, cox2 KX396279, β-tubulin KX396338, RAS KX396313, TEF1α = KX396326
Position in ITS phylogenetic tree
Colonies and cardinal temperatures
Colony morphology cottony with rosaceous pattern on CA. Minimum growth temperature 6°C, optimum 18–24°C, and maximum 36°C.
Conditions for growth and sporulation
Sporangia were papillate, non-caducous, and predominantly ellipsoid in shape. Sporangia averaged 51 x 31 µm (overall range 28–85 x 21–50 µm); Sporangiophores simple or loose sympodia; Hyphal swellings absent. Chlamydospores present, abundant.
Most typical characters
Morphologically similar to other species in Clade 2d.
Additional specimen(s) evaluated
Brazil, Rio Grand so Sul, Triunfo, from Acacia mearnsii trunk canker, AN05; AN12; AN13; AN14; AN23; AN905; AN906; AN907; AN908; AN909; AN910; AN911; AN912; AN913; AN914; AN915; AN916; Piratini, from Acacia mearnsii trunk canker, AN72; AN73; AN74; AN74B; AN87; AM5
Hosts and distribution
Disease note: trunk lesions accompanied by gummosis or no gum exudation, from the trunk base to ~1.5 m of 2–6-year-old Acacia mearnsii commercial plantations
Host: Acacia mearnsii
Additional references and links
Fact sheet author
Treena Burgess, Ph.D., Phytophthora Science and Management, Harry Butler Institute, Murdoch University