The Tropical Fruit Forum

Coffee grounds are about 2% Nitrogen. Some organic fertilisers blends are about that, maybe up to 3% to 5%. Animal manures would be higher again.
I find the grounds a useful liquid fertiliser, also seems to have some soil wetting ability.
Don't overdo it when top dressing pot mix with coffee grounds, it can get clumpy.
Other thing I have noticed since using the coffee grounds,
All my plants are up at the crack of dawn !

Are there any other tropical crops that are unhealthy to eat a lot of? 

Taro and Monstera deliciousa come to mind ( oxalic acid ). Not a problem if prepared properly.
Both Cashew and Mango fruit have irritating sap, many for fruit pickers.
Durian and Jackfruit directly kill a bunch of people ever year, heavy fruit falling on their heads.
Apples have cyanide in the seed, can cause problems if not removed before brewing Scrumpy Cider.

All native wildlife in Australia is protected, (apart from fishing and duck shooting season, some Kangaroo hunting, Agricultural Pest Control Permits).
Not sure if Australian Aboriginal groups with traditional hunting rights still eat them.
I have to confess I know a French vegetable gardener and excellent cook who solved a garden destruction problem, by a gang of large Bush Turkey chicks, via the freezer and cook pot. I hear they were quite tasty.
There has been a population boom in Suburban Brisbane and Sydney.
They are not too bothered by the presence of people, and often inhabit parks and picnic areas etc. and backyards.
https://www.abc.net.au/news/2014-12-26/scientist-cant-explain-brisbane-brush-turkey-explosion/5987606
https://www.dailytelegraph.com.au/news/nsw/grafton/brush-turkeys-invading-suburban-sydney-backyards/news-story/90b551e6f642527762b6f594d1ba0a3e

Some years ago I investigated Veganic Gardening. Soybean meal was suggested as a Nitrogen source.
My friend who lived near a timber sawmill in Australia often collected Acacia melanoxylon Blackwood sawdust for his garden, because of the N content.
Mulching garden beds with Lucern Hay instead of grain straw hay will add additional N.
Another way perennial legumes can add N to the soil is via leaf drop and empty seedpod drop.
Acacias in Australia often have a significant dropped mulch layer underneath the trees.

I think the studies do make some big leaps, from directly injecting/ingesting  rats with Annonacin toxin, to applying the same chemical to extracted neurons in a petri dish. Then connecting this to Annona fruit use.
In the study I looked at from Guadeloupe, the use of Annona fruit and teas was determined by a usage questionnaire to the patients as I remember.
Not sure how accurate that would be, people could easily exaggerate their use to explain their symptoms or downplay their use to avoid responsibility.
Certainly hard to gauge how much Annona people are using on a daily basis.
The presence of a disease cluster was a rate of disease different to the "normal" rate of disease incidence, sometimes in other populations or worldwide.
Otherwise it is known that some plants in the group have insecticidal properties. ( Annona Squamosa and Annona Muricata seed ).

It is reasonably common with Citrus for the scion to die but the rootstock to survive. This could be caused by a freeze but also other stress like drought or disease.
Sometimes the scion will die right back to the to the graft or bud and can recover if rootstock suckers are stopped from taking over.
Death beyond the graft is a loss of the scion variety. You could regraft the rootstock, but for rare scion varieties they may be hard to get again ?
It has been suggested that the graft union acts as a permanent cincture, and this is part of the reason grafted plants flower and fruit early.
( Apart from the maturity of the scion). As you say never 100% fully healed in that respect.
Plants also exhibit fungal dieback. A fungal infection causes progressive plant death down the stem to a lower point.
It is a strategy for the plant to escape the infection. Possibly a scion could be subject to this until the graft union is reached.
With Citrus I have often noticed that if suckers are allowed to grow well above the graft union, they can not only dominate due to vigour, but send the scion backwards and kill it eventually. ( Delayed rejection ? )
Overall I would say the closer related the rootstock and scion are related / the less incompatibility, then the more likely that both will behave similarly.
I certainly have some grafted Fingerlimes that have died back to below the rootstock and some seedling Fingerlimes that died back to the roots but resprouted, so I still have that variety.
Also I have quite a few interesting Citrus seedlings that I grew, where the original seedling was weak and now only survives as grafted plants that I propagated for insurance.
I think you would have to also consider the advantages and disadvantages of grafting to rootstock vs airlayers or even cuttings.
For rare plants you don't want to lose, or can't replace you may want a few versions as a back up plan.

In the USA it is used as a rootstock I hear ? Citrus obovoidea, KInkoji aka Bloomsweet Grapefruit.

Still haven't figured it out. Will try with the rainforest rescue people in Daintree,

Let us know the result, I can't really place it either.

I snagged some seeds off an unripe fruit today. Since everyone picks them they are hard to.get.

Some pics of fruit and seed would be great, looks interesting.

Why are our supermarket chains supporting the cartels?

In Australia supermarkets have been exposed as being complicit in farm worker exploitation, more so migrant farm workers, backpackers and those without work visas who exist in the cash economy. The prices and deadlines they set for farm produce drive the exploitation, based on low wages.
There are also organised crime links to aspects such as farm labour contractors, and the cash economy.

Hi fruitree
What can you tell us about traditional or historic Korean Citrus varieties ?
I believe there are a few long lived trees on Jeju Island.
Also some dating back from before new varieties were introduced more recently.
Any unique Korean varieties ?

Researchers from The University of Queensland have identified two desirable traits in macadamia trees
to make orchards more productive and profitable.

The first trait involves reducing the height of mature trees from an average of 15 metres down to around five, said Dr Alam.
The second trait reduces the time before new plantings produce nuts from five to three years.

https://www.uq.edu.au/news/article/2022/10/tree-traits-boost-macadamia-production

On a similar note
This nursery in Australia sells a Dwarf Macadamia. Reviews say the nuts are also fairly small.
https://www.daleysfruit.com.au/buy/dwarf-macadamia-tree.htm

Subsequently, his wife disclosed that he had habitually consumed pawpaw fruit from their family-owned nursery


The Journal article doesn't seem to cover any other Family Risk Factors, ie Family History of Parkinsons
or for that matter other risk factors from work /lifestyle including chemical use in the plant nursery which could easily parallel the fruit consumption.