It appears that my Imidacloprid treatments of my crotons is wearing off. It makes sense that as a plant grows, the imidacloprid concentration within the plant will diminish. Time is another factor. Seems that the faster growing crotons need more Imidacloprid. Multiple overnight lows in the 50's F and lower 60's really slowed my crotons down. I was very happy that the plants were "hardening off" for the cold season and that my garden was scale free. Temps have really warmed up and new leaves are budding. Checking all the budding leaves revealed croton scale attempting a reestablishment accompanied by ants. Fortunately very few big fat green females were found. Looks like I caught them early. The ants must have been busy as I found croton scale evidence on about 35 plants in random places around the garden. Everything got "nuked" with Dimethoate yesterday afternoon. Hopefully this treatment will get me through the winter. I plan on applying Imidacloprid in late March 2013. Supposedly it will help with the spider mites too. A very bizarre observation is that I had spider mites during our very active rainy season. Now that we enter the dry season, I can't find any. Hmmmm, now that I said that - the spider mite outbreak is sure to happen any day now. Just a heads up to check you plants for scale.