Liability to loss by pests is a great detriment to the popularity of the pear in America. The insect pests of pears are numerous. Codling-moths attack the fruit wherever the pear is grown in America, and can be kept down only by expensive arsenical sprays. The psylla, while irregular in its outbreaks, is most damaging and hard to control when it appears. These are the chief insect enemies, but a dozen others take more or less toll from tree or fruit. Foliage and fruit are attacked by several parasitic fungi, of which pear-scab is most troublesome, requiring treatment wherever the pear is grown, and under favorable conditions for the fungus preventives often fail to give the fruits a fair cheek. But of all diseases pear-blight is the most serious, its effects and virulency being such as to give it the popular name "fire-blight." It is caused by a bacterium which cannot be checked by sprays, and must be combatted with expensive and unsatisfactory sanitary measures, such as cutting out branches and trees, so drastic as to make impossible commercial cultivation of pears in regions where climate favors the disease. Pears compete with apples more than with any other fruit, but are at a disadvantage with this near relative in having a much shorter period during which the fruits can be used. Varieties of the two fruits begin to ripen at nearly the same season, but there are few sorts of pears in season later than December, and these are of poorer quality than the fall varieties; while apples are abundant and of prime quality four or five months later, and may be kept until early apples usher in a new season. During most of its season, also, the pear must compete with the perishable summer and autumn plums and peaches, so luscious and delectable that the firmer and less highly flavored pome-fruits suffer in comparison. Still another reason why the pear is not a popular dessert fruit in America is that, of all fruits, the varieties of this one are the most variable in quality of the product. Sorts that should produce pears of highest quality bear fruits poor or indifferent in texture and flavor in unfavorable seasons, on unsuitable soils, or under neglect. Good pears can be grown only when environmental factors are favorable and under the most generous treatment. Extensive cultivation of the Kieffer and its kin for canning has hindered the cultivation of pears for the fruit-stand and to grace the table as a dessert fruit. So common has the Kieffer become that many of the present generation are hardly aware that the pear may be a delicious fruit to eat out of hand.