in survey of infected samples to downy mildew of broadbean, chenopodium murale and rumex chalpensis using olympus microscope (bh2) and valid keys and recently published papers, two species were identified (choi et al. 2009, ershad 2009, telle & thines 2012).

Powdery mildew is one of the most devastating diseases in cucurbits. Crop yield can decline as the disease severity increases. In this study, we evaluated the effect of silver nanoparticles against powdery mildew under different cultivation conditions in vitro and in vivo . Silver nanoparticles (WA-CV-WA13B) at various concentrations were applied before and after disease outbreak in plants to d...

Callose plays an important role in plant development and response to multiple biotic abiotic stresses. synthase (CalS; EC 2.4.1.34), the main enzyme callose synthesis, has been studied a number of crops but not cucumber (Cucumis sativus L.). In this study, 10 genes encoding putative were identified classified into four clades. Expression levels CsCalS genes, which varied considerably, detected ...

Surveys were carried out to determine species composition and host range of powdery mildews (Erysiphaceae) in Gilan province, Iran. Twenty seven taxa were identified. Among them Erysiphe circaeae, E. punicae, E. urticae, Microsphaera erlangshanensis, M. multappendicis, M. trifolii and Podosphaera clandestine/ var. cydonia are new to Iran. Parietaria officinalis and Phuopsis stylosa are new host...

In spite of the economic importance of powdery mildew on cucurbits, literature and databases about the fungal species reveal different species numbers and names, often indicating only two species, with inconsistent host specificities for different members of Cucurbitaceae. Revision of the available literature indicates the presence of at least six species of powdery mildews on Cucurbitaceae wit...