Small leaf Lilly pilly trees around my swimming pool dying off branch by branch.spider mite i think.

Try ‘Yates Nature’s Way Vegie & Herb Spray’. It's certified for use in organic gardens and there's no withholding period, so you can spray and eat the same day! It's available in a ready-to-use or concentrate bottle. Click here for more info on this product: https://www.yates.com.au/product/garden-pest-control/yates-natures-way-vegie-herb-spray-concentrate