Dear Uli: You've given me the "guts" to chime in... My experience with Imidacloprid under the granular form called Marathon was very positive, but I must emphasize you should use as directed, and I strongly recommend using another form or two of protection in a cycle, even if those forms do not control your scale, whitefly, etc. as well. I knew a graduate student who, at the first sign of whitefly activity would treat again with Marathon, time after time. The product, of course lasted a long time each cycle, but she continued to use it in a greenhouse environment without any thought of some form of integrated pest management. Within a year, the whiteflies had developed resistence. Johannes-Ulrich Urban wrote: >saying that by eyperience such potent products will sooner or later develop >resistences in many insects and for this reason it is better to use other, less >potent products in between. > > -- Mr. Kelly M. Irvin The Bulbmeister 4407 Town Vu Road Bentonville, AR 72712 479-685-1339 USDA Cold Hardiness Zone 6b E-mail: mailto:bulbmeister@bulbmeister.com Website: http://www.bulbmeister.com/ Forum: http://www.bulbmeister.com/forum/