On a recent visit to Franschhoek I noticed that the roses at the end of each row of vines added a lovely romantic touch!  In fact the reason they are planted is not aesthetic at all, it’s very functional and is practiced world-wide.  Roses and grapes are susceptible to the same disease but the roses are more sensitive and act as an early warning signal for mildew which is a fungal disease. Action can be taken to treat the vines – they can be sprayed with fungicides once the mildew is detected. Two kinds of mildew exist – powdery mildew which appears on all green parts of the vine which eventually, if left untreated, split and rot the fruit.  The second kind is called…