Spots on Yucca Plant

[darkandstormy]

I have 2 large Yucca plants in pots on a paved outdoor area that have blackish spots on the leaves from halfway down.

I read to spray them with a fungicide and used Mancozeb twice 10 days apart according to directions.

The spots are still there and now have yellow rings around them and a few leaves are turning yellowish also.

Will this fix the problem as I have not seen results yet?
Will the spots disappear? Or the leaves die?
Have I used the right product?

Any help would be appreciated as I am not much of a green thumb unfortunately

[bubba louie]

bump

[AJ_Greenthumb]

Yuccas are classed as a succulent ? not sure
if so , you may have blackspot , i get the same thing on my Epiphylliums ,
it is usualy caused due to too much water , i had to mix up an enviro friends spray of sulphur and lime and oil i think it was..which dries out the leaf and protects it from future infestations (up to 3 months).
the black spot will dry up and just fall out , leaving a hole in your leaf.
Better than the plant dying i guess.

if you're interested i can post the mixture...but it will send the plant blue , only for a short while.

tell you a story..
i watered my epiphylliums one afternoon.. and left the hose in my shade house and went to do something...
i forgot to turn off the hose at the tap , and during the night the hose come apart slightly at the join..
now we all know cacti do not like too much water..
well the next morning i get up and go outside , only to find a rivver of water running down my driveway...my epi's had copped water all night long...
within a week..they all started to rot.. all the new spikes were rotting , and they were due to flower in a months time ..
this spray was the only thing that saved them as it also stops rott.

this september i should get my flowers

ok ,
cheers
AJ

[darkandstormy]

thanks for your reply..

Id appreciate the recipe for the spray - id rather it be blue for a while than dead! hehe

[AJ_Greenthumb]

ok here we go...
6 and a half level desertspoon full of BLUESTONE (copper sulphate) per 5 litres of water.

12 and a half level desertspoon full of CALCIUM HYDROXIDE ( slaked lime) per 5 litres of water.

dissolve the copper sulphate with most of the 5 litres of water,
then make the calcium hydroxide into a cream with the remainder of the water and stir it into the copper sulphate solution.

Add 0.5 mls of summer oil as a "sticker" ( not needed)

spray every 6 weeks if needed , making sure to spray lower sides of leaves as well.


hope this helps , remember this can be used on all cacti too..

cheers
AJ

[Lin]

Sounds like a Bordeaux mixture - Pete has a similar recipe and some guidelines for it's use here:
http://www.abc.net.au/gardening/stories/s1631445.htm