Hello all.this is my first attempt at posting. We have a 2500 tree grove in Western Australia, close to the ocean. The oldest trees were planted in 2001. Although large and vigourous, many of them have terrible scale infestations so that the current fruit is either sticky with honeydew, or dirty with sooty mould. The scale seem to breed continuously. I spray with white oil mixed with a little Potassium carbonate, but am not having any noticable success in getting on top of the problem. We have natural predators in the grove, like lady bird beetles and predatory wasps, but they aren't winning either. Any suggestions would be gratefully received. Regards, Judith Williams