@VBGigi . . . THAT is the million dollar question!
We all seem to battle fungus, trying to grow pomegranates in the humid South East. Several of us have an ongoing conversation about what is working (sort of) and what is not.
If you read back through this thread - there’s lots of discussion about it.
See @Matt_in_Maryland post in May of 2018. Matt identified the pathogens.
Basically - no one has found the magic bullet, yet. I think the answer is . . . move to California! LOL Or maybe build a huge geodesic dome with a humidifier system!?!
It’s funny though. I had my first 2 pomegranates - a Wonderful and a Granada - produce fruit that was fungus free for a few years . . . And then the fungus arrived. It came in on something. I suspect, perhaps on one of the pomegranate trees that I ordered. ?
I will say this. My plan for this winter is to SPRAY THE #$%^$ OUT OF THEM, while they are dormant. The best advice so far, as to what to spray them with - came from University of Florida. They have had success with these fungicides - Cabrio, Luna Experience, and Penncozeb. They recommend spraying every 2-3 weeks. This was several years ago - and they may have an updated suggestion for controlling the fungus activity. I’ve also read that Captan will control the disease on fruit. (I’ve sprayed my fruit with this and some of it has remained fungus free.)
This year is the worst. I have been spraying the fruit and unopened buds with Captan, as the IFAS literature recommended. For next year - I am considering ordering a bottle of the expensive fungicide that worked in their field trials in FL. (Cabrio or LunaExperience) It would be worth it, if it will control this fungal problem . . . even somewhat.
Also - Literature also recommends Captan for the fruit / Mancozeb for the foliage.
Marc, who used to own Rolling River out in CA, suggested I use copper and lime sulfur. He wrote:
“Organic fungicides to try are copper and lime-sulfur. Micronized copper can be bought as a powder and made into a solution and sprayed onto the infected plant. Lime sulfur is sold as a liquid and made into a spray. They are both very effective fungicides, probably equal to the much more dangerous petro chemical kinds. Copper is a metal, which in small quantities is an important trace mineral. If sprayed repeatedly for year after year it can accumulate in the soil and become toxic, but it takes a lot of use for this to happen. It is very mild and won’t burn leaves when sprayed in summer. Lime sulfur completely breaks down into useful fertilizer (lime and sulfur), but is fairly caustic when first sprayed, so be careful with summer spraying. In the winter when plants are leafless it can be used in the higher suggested range, but in the summer use a more dilute mix. You can still use it pretty strong, but take it slow and see how your plants react first. The air temperature and how strong the sunlight is affects it too. I’ve used it quite a bit in the summer and it really works great. Both are excellent for brown rot with stone fruit too, which your pictures somewhat remind me of. I would highly recommend trying either or both of these before resorting to the harsher chemicals. I would suggest spraying at least every 2 weeks at least first. Maybe even once a week to try to get it under control and then doing a less frequent maintenance program.”
Basically - to help keep the fungus in check . . .
- Clean up all debris. Leaves. Twigs. Fallen fruit. Blossoms.
- Keep warm humid weather pruning to a minimum. (this is a tough one)
- Trim away all diseased branches and any evidence of disease, during winter or late fall. Cut off fruit, at harvest, above the pedicel. Fungus harbors in these little ‘nubs’ where the fruit attaches to the branch.
- Always disinfect pruning tools between plants to avoid spreading disease. 75% alcohol or a solution of water and 10% clorox.
- Spraying with fungicide(s) is almost certainly necessary to control fungus.
I have not had any insect problem, other than the Japanese beetles when they are active. They don’t seem to like the poms very much . . . very little ‘chewing’ damage.
Good Luck. Keep us posted! - Karen