Natural Beekeeping International Forum

[J Smith]

Seeing as how our Rose flowering for the year is coming to an end and the majority of forum members will be heading into Spring soon, this is a handy organic spray for roses that suffer from black spot- often prevalent during damp Spring conditions.

Organic spray for blackspot on Roses
In a 10litre bucket of water add 5 tablespoons of baking soda and a couple of splashes of compost tea or worm farm liquid and a dash of washing up liquid. Mix thoroughly and spray weekly.

[CeeBee]

...and is there any evidence that it works? And that adding Sodium bicarbonate to the environment isn't doing any harm?

[J Smith]

Works on our roses.
I would prefer to add Sodium Bicarbonate to the environment sooner than some of the store bought black spot sprays that have added insecticides to rid the roses of aphid at the same application.