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Pests & Diseases - Australia

Yucca plant - leaf damage

21 years ago

I have a yucca elephantipes placed in a sunroom where it is obviously getting substantial light and direct sun. I bought this rather large specimen about three months ago and have watered it once a month. I have noticed in the past few days that many of the leaves have black spots up to 5mm in diameter that go right through the leaf - on the underside of the leaf the edges of these spots have tiny droplets of a honey coloured liquid. A local garden centre said it is most likely stress from the plant being indoors and to relocate it outside - could be but any other ideas ?

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Comments (4)

User
21 years ago
I put my indoor plants out side under a tree for a while, they also go out on the back decking when it rains maybe that is what it needs. My Yukka lives outside in a huge pot it is not the same one as yours, and has no spots on it. Are you giving it the right amount of water, just remember no plant was meant to live indoors all the time, so put your indoor yukka outside for a time in the warmer weather it should make a difference.

MM.
ShrekandYoshi
21 years ago
Mine is exactly the same!!!

My Yucca has bee living outside for almost 2 year now and has grown really well and is doing great. But every now and then it gets the black spots on the leaves that go right through as you say and then on the underside there is honey like droplets.

I have had to spray them to get rid off some of those little white bugs with the furry butts. There is also a type of spider that seems to like making flat cotton like webs on them but I can't actually see whaty is making the black spots and sticky stuff.
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Hi Tyler. Two years ago my husband was hauling my variegated Yucca indoors. The largest crown from hit the doorway and broke. I didn't want to discard. I first showered the crown. Next I prepared a shallow pot using well-draining soil. Before inserting crown in soil, I cut a little of the stem that was torn off, to even out. Honestly, I can't tell you how long it took to root, but because foliage hadn't died or discolored, I figured something was happening. I left the crown in the shallow pot throughout fall, winter, and part of spring, giving infrequent watering. It was placed about 5' from a south window, (which equals medium/low light here in IL.) The following spring, I removed plant from the shallow container then potted in the same 17" container w/mom. I hope you're following me. :) The stuff you're talking about could be wax..wax is used to transport D. fragrans canes so they don't dry out when shipped to US. The wax might be used for Yuccas too, but I'm not sure. It's usually red in color. Yuccas are slow-growing, some much slower than others. Be patient..lol. Before you know it, you'll have a huge plant..after it gets 'x' tall, hits the ceiling, you'll want to know what to do next...lol. What size is its pot? You can repot, toss most of old soil and add fresh soil, or simply top new soil on old, water and give a dose of fertilizer. Your south window sounds perfect. Yuccas are sun-lovers. 31 floors up, in an unobstructed window, that IS a sunny spot. If you decide to root your yucca crowns, you'll need two pots. Shallow containers are best to root, but it's up to you. Good luck, Toni
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A tree that crashes, perhaps because it lost a lot of fine roots because they dried out during repotting, or you removed a very large % of the fine root mass during repotting, or because you didn't water frequently enough during the immediate aftercare, isn't usually cause for the panic it inspires in growers not used to the fact that your tree will defoliate as a drought response, but usually bounce right back, as long as the tree was in reasonably good health. Young trees, such as you commonly see growing as houseplants, are a very high % of dynamic mass, which gives them a strong "will to live". You really do have to almost work at actually killing them if you have a good soil and don't forget to water for half a trip around the sun. You're using something close to the 5:1:1 mix, so the soil should hold quite a bit of water. Just poke around in the soil a little where there are no roots to see if it's still damp, cuz damp is all you need/want. You don't want wet/soggy. Is your tree FIXED so it can't move in relation to the container. Rigging a tree so if it moves the pot has to move with it helps the tree reestablish much faster. Al
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tmulla1_hotmail_com
15 years ago
I have a yucca silver star it lives in a pot on the deck it has black spots what do i do about this my friendly garderning friends
Pam_loves_2_garden
14 years ago
I have the same problem and came across this information:

Watch your yucca plant or signs of anthracnose of agaves, a fungal disease that causes lesions on leaves and red to orange spore masses. Remove affected leaves at first sign of infection.

6
Check your yucca plant often for signs of spotted mites, which leave tell-tale gray webs under leaves, as well as tan or gray speckling on the plant. Spray the yucca plant with insecticidal soap to control the mites; you can also discourage them by misting your yucca plant frequently.

Read more: How to Care for My Outdoor Yucca Plant : eHow.com http://www.ehow.com/how_6109111_care-outdoor-yucca-plant.html#ixzz1vbLUd1O7

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