Powdry Mildew Jade Plant

cardarlin(5)January 24, 2011

My Jade Plant has had a few rounds with Powdry Mildew since bringing it in from my deck in late October. Because I live in Michigan and its winter its hard to get good circulation in the rooms. I've done the natural method of mixing dish soap, baking soda and water together and spraying it down and the soil as well. But it just keeps coming back. Half of the plant has completely died off. Is there anything else I can do? Would putting a fan in the room help?

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rhizo_1 (North AL) zone 7

Jade is very sensitive to soap applications. It may be that which has caused the death of parts of the plant.

    Bookmark   January 24, 2011 at 12:51PM
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Cardarlin. I'd like to add to Rhizo's advice.

High temps, high humidity, over-watering and low light contributes to powdery mildew. Since grouping plants raises humidity, it's best keeping your Jade solo.

Jades prefer cool temps, high light, low-little humidity and well-draining soil.
Placing a fan in the room, 'as long as breeze isn't aimed directly on plant/s,' help, a lot.'

What's the temperature in the room Jade lives? How often do you water? These are questions you have to ask yourself to figure the cause of mildew.

Are you fertilizing? There's no need to fertilze Jades in winter, especially since you're in MI. Avoid chemical fertililzers w/high Nitrogen.
Once you rid mildew, and your Jade sends out new growth, an organic fertilizer is a better choice.
Water in the morning. It'll give your Jade the rest of the day to dry off, discourages disease, and 'prevents powdery mildew.' Most important, soil should dry between waterings before more water is added.

Two most important factors are: Jades/succulents need sun, (the more the better,) and well-draining soil.

It's probable you've over-watered. Do you check soil before giving soil a drink? Does the pot have drainage holes?

I found this recipe online.

1 teas of Baking Soda
1 quart of Water
2-3 drops of dish soap
Garlic...(Sulfur is effective against powdery mildew. Garlic contains high levels of sulfur. So a 'few cloves,' should be addeed to Baking Soda mixture.) Allow mix to sit overnight before spraying, and shake thoroughly before use.

You did the right thing spraying with Baking Soda, especially if it was applied as soon as you noticed mildew. Spray once a week with the Baking Soda solution.

Hopefully, your Jade will resume to health..In the future, be careful when watering, place your Jade in a cooler room with the brightest light. Artificial light strengthens foliage. Any light will do.

Good luck, and keep posting..Toni

1 Like    Bookmark   January 24, 2011 at 2:00PM
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There's good news, good news and bad news about this subject.

I have a large specimen jade that developed a serious case of powdery mildew when I brought it in from outdoors in the fall.

Apart from following all of the good housekeeping practices (not overwatering, removing the dead leaves, ensuring adequate ventilation, and washing my hands after working on the plant), I treated it with a fungicide containing propiconazole, in this case Honor Guard PPZ.

After consulting the application instructions, I determined that the application rate should be 8 oz. per 100 gallons. I went to my local drugstore and the druggist gave me a free eye dropper that was calibrated in ml. I also purchased a cheap plant mister for less than two bucks at my local odd lot store. I mixed 2.3 ml. of the fungicide in one gallon of water and applied it with the plant mister to the tops and bottoms of all leaves and stems until the liquid was dripping off (i.e. everything was wet). You should follow the MSDS instructions and do this somewhere where the runoff will not be problem (e.g. outside or on a large plastic sheet). Also observe the handling and personal protection warnings.

The good news is that the fungicide did not kill the plant. The other good news is that the powdery mildew is completely gone (I pinched off all of the dead or dying leaves a week after treatment), the plant has returned to good health and is setting new leaves, etc., approximately eight weeks after treatment.

The bad news is that a 4 oz. bottle of Honor Guard PPZ (available from Control Solutions Inc.) is around thirty bucks. Mind you, if you have a large plant that you wish to keep, it is well worth it and you should have enough fungicide to carry out literally hundreds of treatments.

Here is a link that might be useful: Honor Guard PPZ product label

    Bookmark   March 3, 2011 at 3:36PM
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tapla (mid-MI z5b-6a)

Tebuconazole is also available inexpensively over the counter and is an extremely effective systemic fungicide. It's an approved chemical for houseplants, but shouldn't be sprayed indoors. I've used it to treat plants prophylactically for a number of years and haven't yet had a plant react poorly to it. As always, if you decide to use it either as a prophylactic or fixative, read and follow label instructions carefully.


    Bookmark   March 3, 2011 at 4:41PM
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rhizo_1 (North AL) zone 7


Did you follow all of the "must" directions regarding proper, safe, and legal use? I'd like to see pictures of you in the protective gear, lol. And this dangerous chemical is not recommended for indoor, household use.

Here is a link that might be useful: Click here

    Bookmark   March 3, 2011 at 4:45PM
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I had the same powdery white mildew on my jade plants so I sprayed them with the mixture of baking soda, water, dish soap and garlic about a week ago and now they are all dying. Leaves are dropping, the stalks are limp and whole sections of the plants are falling off. These plants have been healthy and thriving for years so when I noticed the mildew, I decided to treat it right away. But now the leaves are still coated with what feels like the baking soda mixture so I wiped them down with a warm wet rag the other day but they're still white and powdery.

I would appreciate any suggestions/advice! I've heard wiping them with rubbing alcohol and a Q-tip might work?

I love these plants and am so proud of how they've grown over the years and don't want to lose them!


    Bookmark   January 26, 2014 at 7:59PM
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I can't understand this issue of powdery mildew and Jades. They are a pretty care free plant if they are given proper light and are not over watered. Cambridge, wondering where you came up with that concoction for the mildew? Follow the proper growing practices for these succulents and mildew will not be an issue.


    Bookmark   January 26, 2014 at 9:31PM
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Thanks for responding. I found the concoction in this message thread above. I have had no issue with my jades until very recently when I noticed the powdery white substance. Maybe it's not mildew after all?

Do you think wiping the leaves off with rubbing alcohol (someone recommended this) and/or water and a Q-tip might help remove the powdery residue left by the spray?


    Bookmark   January 27, 2014 at 9:39AM
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Tiffany, purpleinopp GardenWeb, Z8b Opp, AL(8B AL)

I would like to see a pic of what's going on, if possible. You can add 1 pic per post using the 'browse' button.

If you have a central heating system, the air moves every time it kicks on.

    Bookmark   January 27, 2014 at 10:01AM
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