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If you use plastic tree guards , make sure they are pushed down into the soil to a depth of two inches . Training primarily consists of bending young , flexible branches that are growing vertically into more horizontal positions , toward an optimal 60 degree angle from the main stem . Adult fourlined plant bugs overwinter as eggs laid in clusters into a slit near the top of canes of currants , brambles and other woody plants . Symptoms of gray mold depend on both host and the environmental conditions . 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 . Trees planted on M.7a generally do not require staking , except on windy sites . Control of this disease is best accomplished by preventing the entrance of phytoplasmas into the garden . Keep in mind that trees not only cast shade , but compete for water and nutrients as well ; a planting location beyond the canopy of shade trees is preferable . Because the trees are also proportionally narrower in spread , you may be able to fit two or three trees into a small space , making them a better choice for the urban landscape . Reducing the deer population is a temporary solution at best , and an option not available to fruit growers except those in rural areas . Both apple and pear trees will set abundant crops of fruit if conditions are good during bloom . North-facing slopes and sites that experience winter shade would both work well . Both species ( Heterorhabditis and Steinernema ) have been shown to attack iris borer . Virus-infected peonies may grow and bloom normally except for the strange patterns on the leaves or other subtle symptoms . The fungus produces a large amount of cottony white , thread-like material called mycelium , which can grow up the stems of plants and also spread out across the soil to infect other plants .