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If you have any doubts , consider putting a new plant in a quarantinearea of your garden , where , if it is diseased , the disease can not spread to other plants . Currants and gooseberries are highly tolerant of less-than-perfect sites . Because they bloom fairly early in spring , the trees should not be planted on low sites where cold air may settle . Trees planted on M.7a generally do not require staking , except on windy sites . These numbers are bound to grow as populations swell and are increa-singly concentrated along coast lines and mountain ranges , which often represent tectonically active plate boundaries zones ( Bilham , 1991 ) . North-facing slopes and sites that experience winter shade would both work well . Unlike many other plant pathogens that have narrow host ranges , foliar nematodes , particularly Aphelenchoides fragariae , have broad host ranges and are capable of infecting hundreds of species of plants . Because named cultivars have root systems that are fibrous and shallow , they do not tolerate dry sites without supplemental water . The use of Geographical Information Systems ( GIS ) is becoming commonplace in the Earth sciences , as well as in all aspects of land use management . They often have a crusty or corky appearance , and can occur in irregular patches , or streaks , as well as distinct spots .