White or yellow spots or marks on the upper suface of the leaves. Eventually the leaves will give a silvery mottled appearance. Leaf damage cannot be reversed.
The disease starts as palemarks on coloured petals and brown marks on white petals. The spots enlarge rapidly and by the end of the day, the whole flower has collapsed into a brown, mushy mess.
White patches on stems or pink or brown raised dome like structures on leaves and stalks about 3-5mm
Black sooty growth covering any part of the leaf, stem or branch of plants. Caused by the presences of sap sucking insects on the plants such as aphids, scale and mealybugs.
Thrips suck the sap, leaving a white mottled appearance on leaves. Other symptoms are browning on petals and fruit, and flower drop.
Yellow mottling or bronzing of the leaves similar to lace bug damage. Significant distortion of flower and leaf buds. Fine webbing can be seen on heavy infestations.