In message <[log in to unmask]>, Computer Software Solutions Ltd <[log in to unmask]> writes >Does anybody know of any mathematical relationship between the number of >mites which will fall as the result of the insertion for diagnosis of >Apistan/Bayvarol strips, and the total number of mites in the hive? Norman has answered this so here is a small addition. I suggest you use the OMF under all colonies and put a tray under each for a day or two in May and see what you get. Use the multiplier and take it from there. Use any integrated method you wish and monitor again, say, a month later. Adjust the potency of your method(s) to suit the level found. You can monitor the mites for damage and consider breeding from those colonies doing most damage. What do people say about this approach? I haven't tried it yet as I have chickened out and have only used an annual application as one of the herd but it is the logical conclusion to integration, which would have to be on an individualised basis. The critical time would be late in the year when overwhelmed colonies disperse. -- James Kilty