close-up of a rose leaf showing yellow and brown spots caused by fungal disease, with a dramatic dark background. perfect for use

black spot fungus botanical problems research brown spots rose dark background diplocarpon rosae disease identification diseased foliage leaf closeup plant damage fungal infection symptoms plants garden care pest control gardening challenges issues horticulture infected discoloration macro shot nature health pathology bush prevention treatment problem yellow leaves yellowing close-up showing caused dramatic background perfect use