I Finally got some answers about my fruit trees by sending a photo to the dep of agriculture, and I also showed photos to a small garden centre/ shop
@Don Alaska
(The lady in the small garden centre - originally worked for dep of agriculture)
both agreed it’s a chemical , weed spray issue that’s effected the roots of the trees , they may survive by treating with Seasol spay on ( again) which was done yesterday ..again …with a new bottle I purchased while out shopping ….Hub did it as soon as I got home …its stinks like fish / seaweed ….,so he came in and had a shower right after spraying