The Mai-3 is an awesome fruit and my avatar picture, sweet crunchy and low latex. I heard once that jackfruit is drought tolerant fruit tree which I do not believe to be true at all as on the hottest days I will notice on my two trees that the leaves will sag lower and almost look like they are wilting. I once grew out some seeds in pots and neglected to water them and they dropped leaves like the pictures above, so it may just be a water issue.
You can see in this post the Tony Morris I purchased in May from Excalibur
http://tropicalfruitforum.com/index.php?topic=31905.msg351453#msg351453 and here is its growth as of today.
The tree has drip irrigation connected to it as well as a “bird nest” of Areca palm frond leaves, the areca palms are self cleaning and always falling down in my yard so I have repurposed them as natural mulch, they lock in together and form a “birds nest” and naturally locks in moisture from drip irrigation. I also have fertilized with vigoro Florida lawn fertilizer 29-0-2, a high nitrogen component to speed growth, see cookie monsters thread on high nitrogen and jackfruit. For now I think best plan of action is to water and mulch, then as see more leaves keep momentum going with nitrogen.
-Joep450