That's interesting, Dan. And if that is happening in China it must be happening in vast belts of ag in north america also, right? I agree about the hemp. Supposedly the cotton industry was instrumental in getting it piggy-backed with the marijuana ban in the first place.

I would like to try those markers but I would think the edges of the metal would be very sharp regardless of how smooth you may be able to cut out the shape. I would be careful with the children/grandchildren even handling them never mind making them. I donÂt remember where on the internet I found this idea, but I made these markers last year and they held up well over this past winter. I suppose they could break and become sharp too. I need tall markers because I cannot see markers that are set too low.

One of the motion activated water jets might work. I saw them in the Gardeners supply catalog to scare off wildlife. There are screamer mats to keep kitties off of restricted places in the Doctors Foster & Smith Catalog and also Cat repellant spray for the plants and porch area. An empty soda can with some pennies in it is a good thing to shake when you see them hanging out where you don't want them. Sorry to say but it seems that a cat will always expand its territory to the limit when no other cat is there to defend it. Then they mark the new spaces to keep other cats from encroaching. I love kitties and have found that if you can sprinkle them with the hose when they are trying to claim your space as theirs they will reconsider and it does them no harm.

I found a cool site that lists a number of common garden pests in Australia (includes those that can impact citrus) - https://blog.fantasticgardenersmelbourne.com.au/common-garden-pests-australia/ You may have a couple of things doing something to those leaves.