Question

Name the black spots under the leaf of firm a) vaculos b) pollen grains c) spores d) projections

Answer 1

Black spots on rose leaves are caused by the black spot fungus Diplocarpon rosae. Not only does it make the plant look unsightly, but it also causes the leaves to drop prematurely, which weakens the plant if it occurs repeatedly. The fungus spends the winter on the stems of the rose and on fallen leaves.