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Since this fungus is able to infect many different garden plants , it is important to verify a plant 's immunity . Branches that have relatively wide crotch angles are also stronger and better able to support the weight of the crop . Houseplants which are most often infected include pothos , African violet , begonia , pepperomia , dieffenbachia , and Chinese evergreen . They require acidic , well-drained soils , which are not common in most Minnesota landscape situations . Some home fruit growers construct chicken-wire cages around their fruit trees to keep deer from eating their trees in winter . If rabbits are a problem , enclose the planting with a fine chicken-wire fence . The pH of the soil should be slightly acidic to neutral , about 6 to 7 . Fruit is produced on one-year-old wood . A soil pH of 5.5 to 7 ( moderately acidic to neutral ) is optimal , but growth is fine in alkaline soils as well . 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 . 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 .