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For more information about fireblight , see the Yard & Garden Brief “ Fireblight , ” at http://www.extension.umn.edu/projects/ yardandgarden / ygbriefs / p223fireblight.html . Ideally , the tree should receive one inch of water from rainfall and / or irrigation every week from May through August . " These 4 to 5 scaffold branches should begin about 30 inches from the ground ( 40 inches if turf will be located beneath the branches and need to be mowed ) , should be spaced as equally around the trunk as possible and should be spaced vertically at least 6 inches from one another . Closer planting will make training and management of the trees difficult , and the trees may shade each other so that fruit quality is harmed . Be careful when taking cuttings from plants grown outdoors , as they may be infected but not yet showing symptoms . Position each tree so that the graft union ( identifiable as a swelling several inches above the root system ) is 2 to 4 inches above the soil line . Fourlined plant bugs are active for about a month ; there is one generation each year . While no plants are immune , fleshy-leaved plants are more likely to suffer from oedema than those with thin-leaves . Likewise , the seed from a Honeygold apple will not produce a Honeygold apple tree . Dig a hole large enough so you can spread the root system out without bending the roots . Plants do not store at all well after this dipping regime , so it is best to treat plants about the time they would be breaking dormancy . Planting time is a good time to install a tree guard to protect your tree from winter injury and bark chewing by small mammals . Fungicides help protect plants from disease ; however , they are not very effective at " curing " a problem once it has started . Dig the holes large enough to accommodate all the roots and deep enough so you can cover the uppermost roots with 3 to 4 inches of soil . Errors in the DEM contributed about 9 mm of noise to the coseismic offset estimates obtained by Massonet et al. ( 1993 ) , where rms vertical errors in the topographic data were estimated after the fact to be about + / -24 m. Systematic errors in selected areas can , of course , be much larger than this . It begins early in the spring when the shoots are about six inches tall .