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« on: June 22, 2021, 07:51:24 AM »
There was a recent post on apples in Florida, I figured the topic deserves its own thread for those in similar climates. I do not think the Dorsett Golden and Anna are any good.
I grew apples for nearly 20 years on the coastal Plain of South Carolina. Lots of heat, humidity and fungal pressure, actually worse than my present location in Cape Coral.
Summers there were sweltering with little air movement. Hard to think of a more hostile place to grow apples.
I spent a couple years researching any and all apple varieties known to tolerate heat and humidity. I tried to grow well over 100 varieties, fruiting about 25 or so more than once. Dorsett Golden and Anna were both garbage, the fruit could not take the heat and humidity. Most apple trees themselves grew fine but not the fruit. I found that tolerance to heat, humidity, and fungal rots were much more important than chill hours. In the nearly 20 years I was there, chill hours ranged from about 450 to 850 at my farm in St. George, SC. On the plus side, the only insect pest was the plum curculio which only caused cosmetic damage.
Apples can be grown at altitude in the tropics if they are defoliated with urea after cropping, that stimulates bloom. I attended a lecture at a fruit growers meeting in one of the Gulf coast states given by someone growing them.(red delicious) He grew them in the South Pacific at 5000-7000 feet of altitude not far from the equator. That is not a low chill cultivar and is the apple equivalent of a Tommy Atkins mango.
I found that lack of chill extends bloom periods. This means drought followed by rain can stimulate bloom. Sometimes a period of cooler weather during the Summer/Fall can also do this. Mangos can sometimes throw a few off season bloom too, this is not unique to apples. Some apples bloomed several times a year. You might never get a full bloom if chill is insufficient, but you will still probably get some fruit. One variety, Carolina Red June, even sometimes matured 2 crops in a year.( fruit was small, mediocre and mealy, don't plant it.)
Extended and inconsistent bloom is bad for commercial growers on spray schedules, but not an issue for home growers. Most of the low chill varieties I tried never completely defoliated in Winter unless we had a really hard freeze below about 15 degrees F.
Aside from fungal rots, internal breakdown is a major problem for most apples ripening in hot weather. Several varieties fruited fairly well but had mealy texture. William's Pride had bad breakdown. The only mealy apple that tasted pretty good despite the texture was Arkcharm. The only mealy apples I ever actually enjoyed eating.
The other problems on varieties that can fruit in hot climates are bitter pit and watercore. If you ever ate a bitter but otherwise beautiful Braeburn apple, it had bitter pit.
Water core is actually a treat for home grower. It is actually clear circular areas of flesh up to about quarter size that are SUPER sweet, brix off the charts. It shortens shelf life a lot, so that pretty much eliminates many varieties from large scale commercial consideration.
I grew the best Gala apples ever for a year or two but that variety needs CONSTANT spraying or the fruit will rot. Even then, I lost a lot. I gave up on it, be warned... That variety ticks off all the boxes except for its extreme susceptibility to rotting. Would probably grow great in a desert, it can take triple digits while ripening without breakdown. Water core, yes, but fruit was not mealy.
Pink Lady is one of my favorite apples to eat and the only one I actually buy at the stores. It was nearly a perfect tree and was low chill but rarely held more than a few fruit to maturity despite plenty of pollen. The few fruit that were held, never sized well. It ticked off almost all of the boxes except for productivity. Fuji was unproductive as well as susceptible to rot and bitter pit.
One surprise was Bramley's seedling. It was one of the heathiest trees. Great Britain's best cooking apple, but very acidic and not eaten out of hand there. When I grew it, it had a nearly perfect sugar-acid balance. I bet the brix was close to 20. It was intensely sweet and subacid. An Englishman would probably drop dead of shock eating one like that. I am sure it never ever attained that level of quality in the British Isles. I do wonder how it would perform in Australia if anyone can chime in on that. The tree itself is triploid and seemed immune to fungal problems. Fruit needed minimal spraying since it was late maturity. My goat herd killed that tree when they got into the orchard so I only fruited it twice.
Pristine was also a big surprise. Small, Golden Delicious type. Extended bloom period and very disease resistant. At my farm it started ripening July 4th and season was over a month long. One year it reached 100 degrees F at my farm almost every day for the entire ripening period. A very nice apple, there was some watercore but the fruit was crisp despite the extreme temperatures. Sometimes had partial bloom later in Summer but did not mature 2 crops.
One benefit of high temperatures in apples that can ripen fruit without breakdown is that brix can be off the charts. Most commercial apples are lucky to hit the mid teens, but a lot of apples I grew were over 20 most years.
For a large Golden type, I would recommend trying Ozark Gold. Eating a huge one with water core was a real treat. I tried a bunch of California apples, none of them really did well.
One class of apples that did well are Russets. American Golden Russet did the least well of that class but was still a high quality fruit. Any of them are worth a trial. Hudson's Golden Gem and Brown Russet were very nice and were August to early September apples at that location.
I tried a bunch of Japanese varieties, most took the heat but had high susceptibility to rots. You might not be able to grow apples as a commodity in a subtropical/ tropical climate, but if you are determined and pick the right varieties, you can probably grow some of your own apples. I had planned a pick your own/roadside market and would have been successful if the black bears would have gone away. They were protected and the wildlife people did not designate a bear as a problem for relocation or removal unless it was out and about causing trouble during the daytime. Even one bear can do a lot of damage.
I would try to root a very disease resistant variety in a stooling bed to use as rootstock if I were to start over.