Anthracnose and fruit mummification of olive fruit

Anthracnose and fruit mummification of olive fruit

H.S.S. Duarte, P.G.C. Cabral, O.L. Pereira, L. Zambolim, E.D. Gonçalves, J. Vieira Neto, E.M. Zambolim and V. Sergeeva | View Article The olive tree is an arboreal species belonging to the family Oleaceae with recognized importance in the production of olive oils and olives. In December 2008, typical lesions of anthracnose, with mature fruit mummification (Figs. 1, 2) were observed in olive tree fields in Maria da Fé, in the state of Minas Gerais, Brazil . A fungus was isolated directly on potato dextrose agar (PDA) from conidia collected from pink to orange masses on infected...
Pseudocercospora cladosporioides on olive berries in Australia

Pseudocercospora cladosporioides on olive berries in Australia

V. Sergeeva, U. Braun, R. Spooner-Hart and N. G. Nair | View Article Pseudocercospora cladosporioides (Sacc.) U.Braun (syn. Cercospora cladosporioides, Mycocentrospora cladosporioides) is a common widespread leaf spot disease of olives in most olive growing regions in the world. Cercospora leaf spot of olives has been attributed to P. cladosporioides in Australia (A´ vila et al. 2005). In May 2006, we found P. cladosporioides on berries of olives (Olea europaea) in Australia for the first time. It was isolated from berries of the cultivar FS-17 at harvest at an olive grove in Menangle, New South Wales (3470S; 150440E) (material deposited at the Herbarium of the Martin Luther University, No. 1925 F). The fungus causes small brown sunken spots with greenish boundaries on the surface of the berries (Fig. 1). Infected berries showed signs of rotting. The spots showed the presence of conidiophores and conidia fully agreeing with those on infected leaves where it is commonly found. P. cladosporioides is recognisable by having conidia formed singly, more or less cylindrical, (25–)30–65(–95)3–5 mm, (1–)3–5(–7)-septate, very pale to medium olivaceous-brown, with obtuse apex and obconically truncate or subtruncate base (A´ vila et al. 2005). P. cladosporioides has been found on olive berries in Spain (del Moral de la Vega and Medina Cabezas...
Evidence of early flower infection in olives causing anthracnose disease

Evidence of early flower infection in olives causing anthracnose disease

Vera Sergeeva and Robert Spooner-Hart | View Article We present new evidence for early asymptomatic infection of flowers of olive varieties Barnea and Manzanillo by Colletotrichum acutatum J.H. Simmonds and C. gloeosporioides (Penzig.) Penzig & Saccardo, in Australia. Incubation of the surface-sterilized flowers showed that they were infected from early stages of flowering until fruit set and that the fungi were present in calyx, petals, stamens and pistil. In some instances the pedicels were also...