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Excessive pruning should be avoided because it greatly reduces the crop for that year . 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 . Leave two-thirds of each bulb showing above the soil . By this we mean that , within a given pixel , the position of radar scatterers has not changed to any significant degree , but the ensemble of scatterers ( i.e ., the entire ground surface within that pixel , as well as some adjacent ones ) has moved up , down , or sideways in some correlated fashion . Although one will not know exactly what one is getting with a seedling rootstock — every single seed is a genetically different individual — hardiness , anchorage and adaptability to different soil types are generally excellent . False Japanese beetles and Japanese beetles resemble each other . Both species ( Heterorhabditis and Steinernema ) have been shown to attack iris borer . At that point , caterpillars have grown to about 1 to 2 inches in length . Sanitation - - or removal of any spent flower blooms , infected buds , leaves and stems - - is best done during a dry , calm time of the day . Fertilize the soil every month during late spring and summer , but mix your fertilizer half-strength . Pruning the trunk back in this way is intended to induce branching that will result in scaffold branch options the following year . Both temperature and humidity are important factors in the development of powdery mildew . The main distinguishing feature between the two species is that the Japanese beetle has five tufts of white hair along both sides of the abdomen and two small dots of white hair on the tip of it . Ideally , the tree should receive one inch of water from rainfall and / or irrigation every week from May through August . 2.3 and 2.4 ) have both been identified in SAR interferometry images ( Massonnet and Feigl , 1995a ) . One problem is that earthquakes occur infrequently in any given location , confounding efforts to maintain a high level of preparedness . Control efforts with fungicides require reapplication every 7 to 14 days . Now select 4 or 5 scaffold branches from those that remain , pruning out any “ duplicate ” branches that are growing just above or just below scaffolds . One method of control is to hang a very strongly scented bar of soap in each tree in summer . They are both scarab beetles belonging to the same subfamily , shining leaf chafers ( Rutelinae ) . In order to be effective , they must be applied at the first sign of disease and repeated every 7-10 days . This disease can appear at any time of the growing season , but is most common in cloudy , rainy weather . 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 .