Arabidopsis thaliana is a host to the powdery mildew Erysiphe cichoracearum and nonhost to Blumeria graminis f. sp hordei, the powdery mildew pathogenic on barley (Hordeum vulgare). Screening for Arabidopsis mutants deficient in resistance to barley powdery mildew identified PENETRATION3 (PEN3). pen3 plants permitted both increased invasion into epidermal cells and initiation of hyphae by B. g....

Several leaf spotting or blotching fungal diseases occur on forest trees in Guilan province (N Iran). Some of them such as maple tar spot affect health of host trees severely, but many are of minor effect. This study was carried out to identify unknown and less known fungi causing leaf spot and leaf blotch diseases on broad leaf trees in this region. So far numerous fungi were collected. Four s...

Two powdery mildew species have been collected from Iran. For the first time, Erysiphe magnifica on Magnolia sp. was identified from Iran based on morphological and molecular characteristics. Erysiphe corylacearum was collected for the second time in the country and reported for the first time from Guilan province. There are some polymorphisms in ITS-rDNA sequences of...

A new species of Poemeniinae, Poemenia quercusia Sun & Sheng, sp. n., is described and illustrated. Specimens were reared from twigs of Quercus wutaishanica Blume in Haicheng, Liaoning province, P.R. China. A key to species known from China and the Eastern Palaearctic Region is provided.

A gall midge that induces upwardly folded leaf-margin galls on Quercus serrata, Q. mongolica and Q. dentata (Fagaceae) in Japan and South Korea is described as Macrodiplosis selenis sp. n. (Diptera: Cecidomyiidae). M. selenis is distinguished from Palaearctic congeners by a combination of morphological characters. Genetic differences supported the result of morphological comparison and indicate...

A new genus of oak gallwasp, Coffeikokkos Pujade-Villar & Melika, gen. n., is described from Costa Rica. Diagnostic characters and generic limits of the new genus are discussed in detail. The new genus includes Coffeikokkos copeyensis Pujade-Villar & Melika, sp. n., which induces galls on stems of Quercus bumelioides, an endemic oak to Costa Rica, Honduras and Panama. The new species and galls ...

Recent research has suggested that increasing neighbourhood tree species diversity may mitigate the impact of pests or pathogens by supporting the activities of their natural enemies and/or reducing the density of available hosts. In this study, we attempted to assess these mechanisms in a multitrophic study system of young oak (Quercus), oak powdery mildew (PM, caused by Erysiphe spp.) and a m...

Field surveys in Zagros forests located in western Iran were done to study some aspects of biology and host range of Biscogniauxia mediterranea during 2014-2016. The ability of its conidia and ascospores to cause the disease was evaluated under greenhouse condition. Ascospore viability and development of anamorph and teleomorph were surveyed under different conditions. The pathogen host range w...