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Bio dome plant problems

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Penelope51 starts with ...
Wondering if anyone has advice on what could be causing the following problems in our biodome?

-Wax Jambu pink -back sooty mould & new leaves are bright green
-Abui leaves/ pale & dropping
-Acerola leaves deformed and bumpy with variegated colour
-Cembedak losing leaves and leaves pale (some had mould)
-Papaya yellow spots on top of leaves, black on back
-Mango new leaves bright green
-Soursop leaves yellowing

Lucern was applied heavily in biscuits about 2.5 months ago
Pictures - Click to enlarge

Picture: 1
  
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Penelope51
GYMPIE,4570,QLD
20th June 2022 1:55pm
#UserID: 30381
Posts: 3
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jakfruit etiquette says...
Hard to say. If the biodome is a plastic hoop tunnel, how much condensation is there over the day ? If it is dripping back down it is excessive.The plants are in the soil, so is there any drainage ? Any ventilation/ airflow ? to get any excess moisture out ? Maybe a solar fan or open both ends to ventilate.
The mulch looks very heavy, is it composting and causing fungal problems. Any chance the lucerne has herbicide residue from weed control in the lucern crop ?
The mulch is right up to the trunks, and covering the whole floor. Lucern biscuits can get mouldy inside. Maybe some more pics of the structure would help.
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jakfruit etiquette
MERBEIN,3505,VIC
21st June 2022 10:10pm
#UserID: 5133
Posts: 867
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Penelope51 says...
Thanks for your reply and insight, most appreciated.
Yes, the biodome is a plastic hoop tunnel, and it seems condensation must be excessive as it drips from the dome throughout the day…side flaps and front and back entry points were closed about a month ago (they’re open again now) leaves touching the dome were rotting.
…there was a lot of mould in the lucern (since receiving your reply we have removed most of it). Can you recommend an alternative mulch? …sugar cane? tea tree?
Thank you for your help :)
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Penelope51
GYMPIE,4570,QLD
23rd June 2022 10:08pm
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Original Post was last edited: 24th June 2022 10:23pm
jakfruit etiquette says...
Not sure about the mulch. The lucern biscuits are fairly dense, so a less packed mulch might be better. Fluff it up a bit. Most of my plants in tunnels are in pots with gravel floors. Some are benched on wooden pallets and they eventually rot too. Maybe lightly mulch then compost that and start again. What's the mulch for ? If you are trying to cool the soil have you thought of a shade cloth cover over the top ? New plastic seems worse for condensation. Here it is mainly a problem in winter and after frost.
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jakfruit etiquette
MERBEIN,3505,VIC
25th June 2022 4:10pm
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