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If you discover iris borer damage early in the season , you can crush the insect while it is inside the leaf or remove the infested leaf . The quality of the fruit from these disease-resistant trees is acceptable , although it may not measure up to that of some other varieties recommended in Table 1 for zones 4a and 4b . When it is violated because natural phenomena generate large displacements and displacement gradients ( e.g ., volcanic eruptions , landslides ) , simple differencing of before and after topographic data should be adequate to define the changes to the degree of accuracy required for their study . When using the fruit for jam , you should harvest it before it is fully ripe so that natural fruit pectin levels will be higher . To fully ripen the fruit , remove it from refrigeration and allow it to sit at room temperature for a few days . Lack of resources is an important factor but , even when substantial resources are available , it is often difficult or impossible to acquire the needed information with available techniques without putting field crews at significant risk . Although there is more than one way to prune a fruit tree , home gardeners in Minnesota commonly prune and train using a " central leader " system , where a single central trunk runs the entire height of the tree and supports the fruiting branches . Clip the clothespin onto the leader and position the flexible shoot between the other ends of the clothespin . Drain and pot the plants immediately . Prepare the soil to accommodate one plant by removing soil from a space 15 inches deep by 24 inches wide by 24 inches long . In seismic zones , the spatial density of points required to explain the sources of crustal deformation is strongly influenced by the thickness of the elastic layer . Pruning and Training Pruning for Fruit Production Pruning a tree grown for fruit is somewhat different than it is for a landscape tree such as a birch . The group recommends obtaining the necessary technological support to obtain data that will prove ( or disprove ) the utility of SAR interferometry for eruption forecasting . Since root rot fungi are in the soil , use pasteurized disease-free soil . During the first three years of growth , allow four or five canes to develop per year , removing only weak or damaged wood .