Fire Blight on the quince (Fig. 112) is no less prevalent than Leaf Blight, and it is probable that the former ranks as the most important of quince diseases. It affects orchard trees commonly, and in the nursery is regarded as a very troublesome disease. Entire blocks of quinces in the nursery have been destroyed by Fire Blight. The twigs are killed back and on two- and three-year-old stock the blossoms, which occur profusely, are blighted. The disease occurs widely in the United States on the pear, quince and apple, and not infrequently is found affecting the hawthorn, apricot, plum, service-berry and mountain-ash. In the orchard the quince ranks below the pear and apple in susceptibility; however, in the nursery the order of susceptibility is as follows: quince, apple and pear. Among the quinces there are no marked differences in varietal resistance; all varieties are susceptible. The Fire Blight disease is discussed in detail under Pear (page 323). A special consideration of nursery quinces should supplement the treatment as outlined for Fire Blight of the pear. To avoid blossom blight it is regarded as good practice to remove all blossom-buds from the two-year - old quince trees; this should be done before the flowers open to avoid initial infection.
Fig. 112. - Fire Blight on quince.