Definition of black spot in US English:
black spot
nounˌblæk ˈspɑtˌblak ˈspät
A disease of plants, especially of roses, producing black blotches on leaves.
Example sentencesExamples
- Neem oil also prevents powdery mildew and black spot.
- A soaker hose waters the base of every plant, thereby minimizing black spot and mildew problems that often arise from wetting the leaves.
- Some rose varieties are especially prone to black spot and require regular spraying to keep the plants vigorous.
- Many popular roses are also susceptible to three fungal diseases, whose names black spot, mildew, and rust are descriptive of their appearance on rose leaves.
- To prevent black spot from infecting new plants, spray with a synthetic chemical fungicide once every 10 days, starting in midspring.