We are in the vineyard, doing our first prunings. While I am focussed on just pruning, my husband is pruning as well as watching out for interesting and unusual things in the vineyard. A few days ago, while we were working together, he came across the first ladybugs in our vineyard. The ladybug looked a little weird and was moving quite slowly. It had some yellow stuff on it's wings. Although it looked like pollen, when we took some close up shots of the ladybug, the yellow stuff looked like this:
At home, we learned that this lady bug was infected with the Hesperomyces virescens fungus and what we were seeing was the yellow fruiting bodies of the fungus. I came upon an excellent and freely available article called "Integrative taxonomy reveals hidden species within a common fungal parasite of ladybirds", that contained a very magnified view of the fungus:1
This illustration shows that what we perceived as pollen were groups of the fungal thalli. The illustration on the left shows a single thallus in all it's magnified glory!
We speculate that these ladybugs overwintered in a sheltered place and were out in the spring weather. When and where they became infected with the fungus is a mystery but now we know that the yellow stuff on the ladybugs are fungi!
References:
1. Haelewaters, D., De Kesel, A. & Pfister, D.H., Integrative taxonomy reveals hidden species within a common fungal parasite of ladybirds, Sci Rep 8, 15966 (2018).
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