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Rust - Plant fungal disease
Signs - Very descriptive these fungal diseases - looks like the pant is going rusty. Orange-brown pustules develop initially on the undersides of leaves. These may be unnoticed for some time, so by the time the pustules appear on the upper leaf surface and are noticed, the disease has taken hold. Actually a whole group of different fungi can cause the disease known as rust, and different types often have different host preferences and life cycles. Damage - Not usually a killer, but very unsightly and badly affected plants can be so weakened they are unable to withstand winter frosts. Treatment - A fungal disease so one of the best ways of dealing with it is by good hygiene. Remove all dead leaves in autumn to prevent the spores from over wintering, burn the leaves or take them to the skip rather than use them for compost or you may well just perpetuate the problem. Grow resistant varieties. Badly infected plants are best discarded - on the bonfire or tip, not the compost heap - and replaced. Improve ventilation for plants grown under cover. Keep plants watered and fed well so they are able to fend off the effects of rust with their own immune system. Hollyhocks will almost always get rust, the best way to deal with it is to grow new plants each year as older plants will just get worse and worse.
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Make sure you shake the bottle well before
use as the active ingredients often settle to the bottom - take it from me
I learned the hard way!