Just be careful with this stuff, it is lethal to bees and any water living creatures.
Not sure about the stem, but it is definitely mildew on the leaves.
Hate to disagree with anyone ,but soap made for human use is not to be recommended for spraying in the garden, it contains some quite nasty...
Aphids on Roses are normally either green or red. Grey ones are more oftenfound on Lupins or members of the Cabbage family. Either way fungicide...
Separate names with a comma.
