Black spot on Gastoaloe

Black Spot

 

Please go to our Glossary link at the bottom of the page for explanations of scientific terms



Identification

Identification is the easy part, black spots occuring on Aloes and Gasterias, usually on the older leaves.
It may be caused by a fungus called Montagnella, or by stress, or maybe by a combination of the two. Insect damage may allow black spot entry to the plant.

Prevention

There is some evidence to suggest that if plants are grown "hard" - that is, in good light, with good air circulation and with good nutrient supply and good greenhouse hygeine, then incidence of black spot is less.
Eliminate biting/sucking insects in the greenhouse.

Back to previous page

Black spot on Gastoaloe


Cure

As there is still confusion as to the causal agent, there is no cure as such. Some treatments can sometimes alleviate the symtoms.
Regular sprays with a copper fungicide can help. Possibly the fungicide Mancozeb can help.

More information/speculation can be found here in a pdf file.

Back to previous page