Rust fungi infecting hollyhock and other plants in Malveae are frequently intercepted at ports of entry to the USA, particularly Puccinia malvacearum and P. heterogenea. These two species can be difficult to distinguish and can be further confused with other, less common species of microcyclic rust fungi infecting hollyhock: P. heterospora, P. lobata, P. platyspora, and P. sherardiana. Molecula...

The taxonomy, morphology and distribution of  rust species on Arundineae (Poaceae) in Iran was studied. Five species of Puccinia viz. P. magnusiana Körn., P. phragmitis (Schumach.)Körn., P. isiacae G. Winter, P. trabutii Roum. & Sacc. and P. akiyoshidanensis Morim. are described and illustrated. Of these, Puccinia akiyoshidanensis is considered as a distinct species and newly recorded for Irani...

A number of different fungal hyperparasites have been observed to grow in pustules of rust fungi. Examples of these are Verticillium (HASSEBRAUK 1936, KOTTHoFF 1937, GAMS 1971), Darluca fi/um (KRANz 1973), Monocillium nordinii (TSUNEDA and HIRATSUKA 1980), Alternaria and Cladosporium species (OMAR and HEATHER 1979). Verticillium lecanii may be the most interesting fungus for biological control ...

Based on the floristic study of rust fungus flora (Uredinales) ofGolestan National Park, located in the Northeast of Iran, 68 rust taxa were recognized. Of these, one subspecies and five species viz. Phragmidium sanguisorbae subsp. mediterraneum on Sanguiosorba minor, Puccinia difformis on Galium aparine, P. jasmini on Jasminum fruticans, P. rhylismoides on Thalictrum isopyroides, Uromyces mogi...

Rust fungi are destructive plant pathogens. The draft genomes of several wheat-infecting species have been released and potential pathogenicity genes identified through comparative analyses to fungal pathogens that are amenable to genetic manipulation. Functional gene analysis tools are needed to understand the infection process of these obligate parasites and to confirm whether predicted patho...

Rusts are one of the most severe threats to cereal crops because new pathogen races emerge regularly, resulting in infestations that lead to large yield losses. In 1999, a new race of stem rust, Puccinia graminis f. sp. tritici (Pgt TTKSK or Ug99), was discovered in Uganda. Most of the wheat and barley cultivars grown currently worldwide are susceptible to this new race. Pgt TTKSK has already s...

The role of extracellular fl-1,3-glucanases and chitinases was investigated in oat leaves after infection with different rust fungi . The oat leaves (Avena sativa L .) were inoculated with the compatible rust Puccinia coronata f. sp . avenae and the two nonpathogens Puccinia recondita f. sp . tritici and Puccinia graminis f. sp. tritici . No alterations in enzyme activities were found in the co...

the percentage of urediniospore germination of two isolates of yellow rust {puccinia striiformis f. sp. tritici) namely, wyr 69/10 |race 104e 137(1)] and isolate wyr 79/4 |race 41e 139 (4)], was studied at various temperatues between 5-20°c on agar and the adaxial surface of detached leaves on a layer of benzimidazole agar. four replicates for five temperature treatments were arranged as a ...