Puccinia allii

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Rust fungi parasitize on vascular plant specimens from numerous botanic families. It is significant, that the life cycle of this fungus has several forms of sporification. Also it’s common for them to produce spores and disseminate them in quantity, which may cause an epyphytoty.

Genus Puccinia Pers. is the largest in the order Uredinales. It includes both monoecious and dioecious species, with Puccinia allii (DC.) Rudolphi affects differet species of genus (Allium сера, A. sativum, A. porrum, A. fistulosum, A. ursinum, A. atroviolaceum, A. brevidens, A. monadelphum, A. platyspathum). It occurs everywhere. On the surface of onion’s leaves there appear prolonged, dispersed, sometimes interfluent pustule with urediniospores (fig. 1).

First they are covered with suberect epidermis, through which one can see masses of yellowish-brown urediniospores (fig. 2). Epidermis breaks and urediniospores flow out on the leaf’s surface (fig. 3, 4, 5). Urediniospores are more or less globular, elliptic or egg-shaped, aculeolate, 18-32х18-24 µm (fig. 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16). Teliospores are positioned in black, flat, differently shaped, covered with epidermis acervulus, bicellular, mostly oblongly-clavate or clavate, rounded on top, often dulled, coarctate or truncated, with solid sporoderm, slightly constricted, narrowed to the bottom, smooth, 35-80х17-30 µm, brown, on a very short, firm stem, numerous paraphyses are at hand (fig. 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30).

(This page was moved here from http://phytopathology.net/Portal/Puccinia_allii )