Final diagnosis


Cercospora longissima (cercospora leaf spot)

The spots spread; they reveal an irregular shape, more or less rounded to angular when delimited by the ribs. A fairly limited yellow halo surrounds them. <b> <i> Cercospora longissima </i> </b> (Sigatoka, "<i> cercospora </i> leaf spot")
Cercospora2
Cercospora10
Cercospora5
Cercospora3
The spots, initially damp, quickly turn brown; a central area remains clear. <b> <i> Cercospora longissima </i> </b> (Sigatoka, "<i> cercospora </i> leaf spot")
Cercospora11
Cercospora12
The spots eventually merge. The fabrics of some of them are tearing. <b> <i> Cercospora longissima </i> </b> (Sigatoka, "<i> cercospora </i> leaf spot")
Cercospora6
Cercospora1
Cercospora4
Cercospora7
Cercospora13
Cercospora8
Cercospora9
On necrotic tissues, we can easily observe tapering conidiophores, grouped in clusters, carrying at their end filiform and multicellular conidia. <b> <i> Cercospora longissima </i> </b> (Sigatoka, "<i> cercospora </i> leaf spot")
Several unbranched and erect conidiophores of <b> <i> Cercospora longissima </i> </b> (Sigatoka, "<i> cercospora </i> leaf spot") are visible on the epidermis of this leaf. Initially hyaline, they gradually turn brown.
The conidia formed at the end of the conidiophores are hyaline and cylindrical. They show from 1 to 18 partitions and measure from 11 to 170 µm in length. <b> <i> Cercospora longissima </i> </b> (Sigatoka, "<i> cercospora </i> leaf spot")