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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 . 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 . If you prune off the wilted shoot near the base and look at it in cross-section , you will see that the water conducting system inside the stem has turned brown . More often , infection occurs on individual stems near the soil line . However , several diseases can affect daylilies grown under poor cultural conditions , especially if plants are overcrowded , planted in poorly drained soil , or subjected to prolonged periods of warm , wet weather . It feeds upon numerous plant types , including flowers ( particularly roses as well as flowers such as peony and dahlia ) and fruits ( e.g ., grape , raspberry , and strawberry ) . It frequently hangs over at or near the lesion . Because currants and gooseberries do not perform well under dry or waterlogged conditions , most soils will benefit from the addition of organic material such as shredded peat or compost before planting . However , evidence indicates that some pear varieties may be self-fruitful under some conditions , and you might be able to get a small amount of fruit with only one tree . This disease , caused by bacteria present in the soil , infects plants through wounds or natural openings near the root crown of the plant . Dwarfing rootstocks reduce tree size by up to 75 % , so that a tree may be only 8 , 12 , or 15 feet tall when mature , depending upon its rootstock , scion variety , and growing conditions . For this reason , carefully clean soil off your tools and even your shoes . This will keep voles from burrowing under them to get at the trees . Upon identification of gray mold , infected plant material should be removed and disposed of . Upon drying it leaves a brown spot on the raised area . Scab spores overwinter on fallen apple leaves , so removing all leaves from under the tree in autumn can lessen the severity this disease , although it may not prevent it . Unlike most plant pathogenic nematodes , foliar nematodes live in and feed upon the aerial portion of the plant .