all compost leaches nutriments to the water and air i take yellowing as the first signs of feed loss it can be too much water but usually its feed
if the marks on your leaves feel sticky then it is aphid goo if not then mag is probably correct . the goo and mag cling to or manifest themselves in or on the fleshier or higher parts of the leaf but a good feed of epsom salts and tommorite will buck them up
f1 incas are not an outdoor variety i think (check with dobies )and will need some protection ,not against late frosts but against temperature drop
i hope this is of use
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