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Secondly , while high-resolution data are generally required only in specific regions , these can be located anywhere on the globe , meaning that the data should be obtainable anywhere . There are a few varieties of apple available that are resistant to apple scab , the most important and destructive disease of apples in Minnesota . Though the corresponding spectrum is continuous ( from a few hours to several months ) , the response mechanism of the solid Earth is the same as for tidal loading . Some varieties are resistant to apple scab ; see Table 1 . Before each cut is made it is advisable to dip the pruning shears in a 1:10 chlorine bleach : water dilution . After the initial pruning at planting , fruit trees should be pruned on an annual basis in late winter — preferably after the coldest weather is past — before they break bud .