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| the offspring of a zebra and a donkey. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| black spot | |
| —n | |
| 1. | a place on a road where accidents frequently occur |
| 2. | any dangerous or difficult place |
| 3. | a disease of roses, Diplocarpon rosae, that causes circular black blotches on the leaves |
black spot
common disease of several plants that is caused by species of Pseudomonas bacteria or by many fungus species in the genera Asterina, Asterinella, Asteroma, Diplotheca, Glomerella, Gnomonia, Microthyriella, Placosphaeria, and Stigmea. Infections occur during damp periods and appear as round to irregular black leaf spots, sometimes on petioles, stems, and flower parts
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