. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. ASCOMYCETES 267 There are probably no varieties of the pear or apple which are entirely free from scab. Nevertheless, there is a great dif- ference in susceptibility. In New York, Flemish Beauty, Sum- mer Doyenne, Duchess, Clairgeau, Sheldon, Seckel, Anjou, and Lawrence have been reported as more generally affected than Le Conte, Kieffer, and Bartlett. In California the later varieties like Winter Nellis and Easter Beurre are said to be more sus- ceptible than the Bartlett, which,
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. ASCOMYCETES 267 There are probably no varieties of the pear or apple which are entirely free from scab. Nevertheless, there is a great dif- ference in susceptibility. In New York, Flemish Beauty, Sum- mer Doyenne, Duchess, Clairgeau, Sheldon, Seckel, Anjou, and Lawrence have been reported as more generally affected than Le Conte, Kieffer, and Bartlett. In California the later varieties like Winter Nellis and Easter Beurre are said to be more sus- ceptible than the Bartlett, which, however, is only resistant to an intermediate degree. The susceptibility of different varieties of apple to the apple scab seems to vary considerably according. Fig. 119. Conidial Stage: Fusicladium of the Pear Scab Fungus to the region in which grown, yet nearly all of the standard varieties may be affected during seasons favorable to the fungus. The fungus. The spores of the Fusicladium stage germinate readily in water and develop a short germ tube, or sometimes two germ tubes. The germ tube sometimes forms a dark spore- like structure, if the conditions are not favorable for further rapid growth. This structure is scarcely in the nature of an appres- sorium, and may be considered a resting stage, which will grow out into mycelium under favorable conditions. It is believed that the mycelium of these two species of fungi develops for a short time superficially, then penetrates the epidermis in some way. At any rate, the mycelium is found at a very early stage beneath. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Duggar, Benjamin M. (Benjamin Minge), 1872-1956. Boston ; New York : Ginn
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