anyone know what this is ?

[clovisman]

I think I would think about getting the neem oil on that! Its worked for me on a lot of problems!

I have used a a spray made from water and baking soda- found info on a site - resource quide for organic pest and disease control- tried to post link here but had problems -it seems that in Russia potassium bicarbonate has been used to control fungus for decades