1. Flat top decay syndrome of the giant cardon cactus of Baja California, Mexico Other symptoms of flat top decay and gray decay (Presentation no. 4) Click to progress

2. A second pattern of flat-top decay, found only in the southern Bahía Concepcíon area (site 4 on the map). The decay starts with a single deep crack in the main stem of the plant, without apparent additional rotting

3. Deep cracks may appear anywhere along a branch

4. When the crack is deep enough, the branch falls

5. Common flat-top decay of cardon at Bahía Concepcíon

6. A flat-top branch may develop a new side branch that can grow to more than 5 m

7. A third type of decay, found only south of El Conejo. The entire plant becomes gray or white and later dies

8. Please download presentation number 5 describing why the affected cacti disappear