Plectosphaerella cucumerina

Plectosphaerella • Glomerellales • Sordariomycetes • Ascomycota • fungi • plant diseases • pests-diseases-weeds

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Plectosphaerella cucumerina - from left to right and top to bottom a-e) colonies on PDA after 14 d at 23 ± 2 °C, f–h) asci and ascospores, i) hyphal coil with phialides, j–p) phialides, q) aseptate conidia, r) 1-septate conidia, s) conidiophore. — Scale bars: f–i = 10 μm; j–s = 5 μm (click on image to enlarge it)
Author(s): A. Carlucci, M.L. Raimondo, J. Santos and A.J.L. Phillips
Source: Persoonia (2012) 28, p. 40

Plectosphaerella cucumerina (Lindf. 1919) W. Gams 1968

The fungus is widespread in tropical and subtropical regions and infects cucurbits and other crops. It is also regarded as a saprophyte and can be commonly found in soil and plant debris. An important disease is Plectosporium blight of cucurbits, characterized by bleached, diamond-shaped lesions on leaf veins and petioles. Yield losses on cucurbits may exceed 50%. Other diseases include leaf spots, black leg or root rot and wilts. The conidia disperse through rain splashes and wind. They are elliptical to cylindrical in shape, sometimes with 1 septa, and about 5-9 x 2-3 µm large. For controlling cucurbit blight, crop rotation and fungicides are recommended. For studies of this fungus as a possible biocontrol agent of weeds see P. cucumerina as weed pathogen

Synonyms:
Fusarium tabacinum
Microdochium tabacinum
Monographella cucumerina
Plectosporium tabacinum (anamorph synonym)

• Other images of Plectosphaerella cucumerina (IPM Images - click to enlarge)
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  symptoms on Cucurbita pepo

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  symptoms (diamond shaped lesions on petiole) on Cucurbita pepo

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  symptoms on pumpkin fruit

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  conidia