Colletotrichum acutatum

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Colletotrichum acutatum - A–B) conidiomata, C–I) conidiophores, J–Q) appressoria, R–S) conidia, scale bars: A = 200 µm, B = 100 µm, C = 10 µm, scale bar of C applies to C–S (click to enlarge)
Author(s): U. Damm, P.F. Cannon, J.H.C. Woudenberg and P.W. Crous
Source: Studies in Mycology, 2012, 73, p. 55

Colletotrichum acutatum J.H. Simmonds 1968

The fungus is wide-spread in temperate and subtropical regions, but is still under quarantine in some countries. It has a large host-range, causing economically important diseases like anthracnose, blights, fruit drop or crown rot. Commonly infected crops are fruits like strawberry, citrus, apple (bitter rot), olive (olive anthracnose), almonds or blueberry and vegetables like green pepper. Losses of up to 80% have been reported from unsprayed strawberry and almond crops.

Infections start on the leaves or fruits through the germinating conidia and can spread rapidly inside the plant. On strawberry, the whole fruit may be infected within 2-3 days. The main symptoms are sunken and necrotic lesions.

Colletotrichum acutatum symptoms on strawberry
Author(s): John Hartman, University of Kentucky
Source: IPM Images

The fungus seems to disperse mainly through rain splashes or by over-head irrigation and can also overwinter in the soil. The fruiting bodies produce pink, orange or salmon-coloured spore masses.

The conidia are elongated, tapering at the ends, around 10-15 x 3 µm large. Control can be difficult under high disease pressure and both fungicides as well as resistant cultivars not always give satisfactory results.

Glomerella acutata

For Glomerella acutata var. fioriniae Marcelino & Gouli 2008 see Colletotrichum fioriniae (Marcelino & Gouli) R.G. Shivas & Y.P. Tan 2010