How long are they planted before this happens? And where are they planted, in a container or in the ground?

Pansies tend to be best for winter and spring planting as they aren't able to cope with hot days of summer. They tend to stretch, lose colour and sometimes get these patches which i believe is something to do with to little water and then to much. It happens all the time at the nusrsery as they dry out so quick in tiny cells, and we always tell people that they are best suited to spring and winter etc, and there are only a few varieties of pansy/viola that is 'summer tolerant'.

Bambo
Thanks for your response, there has been a long fordelay on my part as I could not work the sustem,but have now been shown by a friend.
the pansies are well grown possibly three months old and if in pots the problem is about 100% of plants diseased but if in the garden only about ten % .

Nickyt08
Thank you for your response and advice to the pansy problem question sorry for the delay in sending my thanks, but I could not wrok the system for responding but with the help of a friend have now manageged.

Well there are two or three things this could be, both of which cause purple brown spots on the upper leaf surface - Pansy Downy Mildew and Pansy Leaf Spot. Both are fungal diseases, and difficult to control, though a fungicide called mancozeb may have some effect, if its still available.

There is another fungal disease of pansies too, Pansy sickness, but this doesn't usually occur with purple spots, rather the foliage yellows and dies off. As you seem to be having more trouble with pansies in containers, I'm wondering whether you reuse the same compost, or don't clean and sterilize the pots before planting. Recommend you clear out all containers, dispose of compost, scrub them well with hot soapy water, rinse thoroughly and dry, then use fresh compost. This may well reduce or solve the problem.

Bambo
Thanks for your advice and you are right, I often neglect washing used pots
and also use compost a second time, so I must take more care with these
things.
You are also probably right in blaming fungal diseases, as I get black spot,
rust, powdery mildew on my roses and flowers, but the bigest problem has
been brown rot on my apples, pears & plums,I did spray an anti fungal solution in June but the has made no difference.

regards
dabo