Sampling Leaves to Estimate the Density of Brown Mite, Bryobia Rubrioculus (Acarina: Tetranychidae), on Apples

In the first generation brown mite, Bryobia rubrioculus (Scheuten), on apple inhabits the wood as well as the leaves. To eliminate sampling the wood, which is very tedious and time consuming, equations were developed to describe the total population of immature stages and adults from observations of the number of mites on the leaves alone.