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Tag Archives: RHS
Powdery mildews (PMs) are common plant pathogens with obvious symptoms seen on leaves, shoots, buds and fruits of plants. Their occurrence and spread is therefore relatively easy to monitor and as such new disease reports (NDRs) are common.
This morning I was lucky enough to find a sealed envelope waiting for me on my desk. I had an idea and hope of what it may contain, and was far from disappointed… In mid-May of this year the Powdery … Continue reading
Please refer to the 2015 survey for updated info. As part of the Powdery Mildew citizen science scheme, I am asking YOU to keep an eye open for powdery mildews. Powdery mildews commonly occur on garden plants, are unsightly, and … Continue reading
With approximately 800 different species of powdery mildew present on earth today, grouped into 13 genera (according to Braun & Takamatsu, 2000) of 5 tribes, combinations of the aforementioned features, as well as many less superficially obvious, are numerous. While many … Continue reading
Like any organism reproduction is key to the life of the powdery mildews. Their short generation time and mixture of asexual (self-replication) and sexual life cycles have evolved to produce the veracious organisms which blight many of our agricultural and … Continue reading
Amongst the most important visual, superficial features of the powdery mildew are their appendages. These limb-like features arising from the surface of the, sexual spore containing, chasmothecia are important for latching onto the stems and leaves of their hosts. They vary … Continue reading
After establishing itself on a host a powdery mildew can begin to reproduce. Asexual conidia (spores) are produced as 3-D protrusions, on structures called conidiophores, from the predominantly 2-D mycelial network on the surface of a host. In this aspect … Continue reading
The year 2000 saw a major revision of the taxonomy of the powdery mildews originally proposed by Braun (1987). The new monograph saw the recognition of the five major lineages of the Erysiphales therefore establishing the five ‘tribes’ (table 1).
Winter is here and with it we have left behind my dear biotrophic fungus, the powdery mildew (PM). Requiring plant material to source nutrients to grow and reproduce means that with the dropping of leaves, characteristic of ‘Fall’, PMs must … Continue reading
Since the visit of powdery mildew expert Dr. Roger Cook in mid-August I have been pressing on in order to successfully culture colonies of the Erysiphales. This has involved experimentation with various methods, including infection of both detached leaves and fresh … Continue reading