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I am currently using Quantum-Total. I apply it at about a 1.5-2% dilution every 3 or 4 weeks. The microbes populate both the media and the plants, so the idea is to maintain a strong population by periodically dose them for reinforcement. Letting the potting media dry definitely reduces the...

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Probiotic treatments can be curative. The trick is finding the microbe that attacks the pathogen at issue, which is why complex consortia are preferred. Sort of the "shotgun" approach versus "the rifle" of a single species that may-, or may not be properly aimed.

https://greenbarnorchid.com/

Thanks for the update, Clark. I guarantee Kelpak will be beneficial, but to some degree, it depends upon how it is used. The manufacturer recommends not applying it more often than every two weeks, nor more dilute than 1:500. In the 11-12 years I’ve been using the stuff, I’ve settled on...

You're right. The airiness of LECA comes into play with the spaces between them, not within the particles themselves - they are superior at holding water. If you had 100% spherical particles of the same size, that would be roughly 40% open space. Any irregularity in size or shape decreases...

@Tom-DE have you considered using LECA instead of sponge rock? Water holding capacity is similar and it won’t crumble over time. It is heavier, but not enough to be an issue in a blend.

Welcome aboard, Dom.

Nice! Welcome to the group.

Why bother? I’ve reused soil for several years with no modification, other than tilling - sort of like farmers all over the world.

It’s tough to diagnose some things. My first thought was pseudomonas as well - a bacterial disease - but anthracnose, a fungal infection, may look similar. A treatment with a copper-based product can help with either.

Just a "heads up" - I've sold enough to make space for the material coming in on Monday, so I'm going to end the sale at midnight Eastern tomorrow. If you're looking for a price break, don't wait!

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I acquired one from a grower here. In my experience, they appear to take a long time to build up enough mass and phytochemical resources to be "comfortable" enough to expend them on reproduction, but once they get there, they're pretty regular.

I'm down to my last few cases of Kelpak, but I need to get them gone so I have room for the next load. So...until these are gone, ① I have reduced the price, ② other discounts still apply, and ③ free shipping to US addresses is still included. These, and the bottles coming in have an...

acmodomtum x hookerae

Yeah, maybe you waited “a bit” too long….

I agree; mites, which are affected by neither insecticides nor fungicides. From a cost perspective, the first thing I’d try would be OrganiShield (formerly sold as SucraShield). It is not a toxin, but a “super surfactant” that is a contact killer by stripping the protective coatings off...

Generally speaking, I think folks that are having issues overdo it with disinfectants, bactericides, and fungicides. In the vast majority of cases, the true issue is poor culture, often due to ignorance of the needs of the plant or I attention to the fact that something has changed. One major...

Without a yellowish tinge to the leaves, that is not fusarium, it is straight up desiccation. I just hope your extreme treatments haven't rendered the root system ineffective. Ideally, you want to keep the potting medium moist at all times. See if you can get some Kelpak (I know it's...