Do you think this powdery mildew on Aster squamatus is a Golovinomyces asterum sl ? Scale is at 2.5um / division.
Possibly a Golovinomyces asterum on Aster (Smphyotrichum) squamatus
- Steve_mt
- Erledigt
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Hi Steve,
I agree that this should be G. asterum. By the way, I recommend to look at Erysiphales in water and not to stain it with congo red. In some cases, you have to judge if fibrosine bodies are present and I do not know if they survive in congo red.
Björn
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Thank you for the tip regards staining
I often stain automatically mounts so good to know about this hint. Accidentally, some spores would not take the stain and do not know if that might avoid adverse reactions on the fibrosine bodies.Hi Steve,
I agree that this should be G. asterum. By the way, I recommend to look at Erysiphales in water and not to stain it with congo red. In some cases, you have to judge if fibrosine bodies are present and I do not know if they survive in congo red.
bjorn
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Hi Steve,
even if some conidia remain unstained, I would still recommend using water instead of congo red (in NH3?) since it is unclear what the chemicals do to the fibrosine bodies or how they change the size of the conidia.
Björn
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https://www.agriculturejournals.cz/publicFiles/129_2019-PPS.pdf
Possibly it is var. moroczkovskii (see figure 3 of the paper)
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I agree on that. It's also the only variety that Klenke and Scholler mention on Symphyotrichum.
Björn
