Leaf necrosis due to p.ramorum pathogen
Lepidium oligodontum heavily infected with Albugo candida. As explained in de Lange et al. (2013) Albugo plays a prominent role in the ecology of this species
de Lange, P.J.; Heenan, P.B.; Houliston, G.J.; Rolfe, J.R.; Mitchell, A.D. 2013: New Lepidium (Brassicaceae) from New Zealand. PhytoKeys 24: 1-147
Parasitic on rocket (Eruca sativa subsp. sativa). Scale bar in mm.
I am calling this Albugo candida because that is the name used for any 'white pustule-forming' Albugo found on New Zealand Brassicaceae - but it is not entirely clear if all the "Albugo candida" we have here is truly that species, or whether some are endemic strains or even new taxa.
A critical reappraisal of the New Zealand Albugo using modern molecular methods is sorely needed.
Mildiu de la cebolla
On Ca Bay Laurel in Armstrong Woods
Oomycota or oomycetes (/ˌoʊəˈmaɪsiːt/) form a distinct phylogenetic lineage of fungus-like eukaryotic microorganisms. They are filamentous, microscopic, absorptive organisms that reproduce both sexually and asexually. Oomycetes occupy both saprophytic and pathogenic lifestyles – and include some of the most notorious pathogens of plants, causing devastating diseases such as late blight of potato and sudden oak death. They are also often referred to as water molds (or water moulds), although the water-preferring nature which led to that...