Fungous malattie delle piante . r meno poligonale in profilo. L'asci sono clavate tooblong o leggermente incurvata, 55-75 X 6-i2/x. Essi sono numerosi trovanella perithecia e così lontano come osservato non ci sono paraphyses. Thespores sono otto, diventando due-celled, uno dei quali è più grande altodel altri. Le spore sono oliva-di colore marrone, 11-15 x 5-7 M. istologica di sviluppo del perithecium non ha beenfollowed. La delle ascospore germinano facilmente in acqua e alcune volte vero appressoria sono prodotte, come indicato nel caso della 270 FUNGOUS MALATTIE DELLE PIANTE La germinazione dei conidi. L'osservazione h

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Fungous diseases of plants . r less polygonal in outline. The asci are clavate tooblong or slightly curved, 55-75 X 6-i2/x. They are numerous inthe perithecia and so far as noted there are no paraphyses. Thespores are eight, becoming two-celled, one of which is larger thanthe other. The spores are olive-brown in color, 11-15 x 5-7 M. The histological development of the perithecium has not beenfollowed. The ascospores germinate readily in water, and some-times true appressoria are produced, as stated in the case of the 270 FUNGOUS DISEASES OF PLANTS germination of the conidia. The observation has been made(Chnton) that the scab is first seen more abundantly on the lowerleaves, and from this the inference is drawn that infection ischiefly as a result of the production of the perfect or Venturiastage on old leaves which have fallen to the ground. The pro-duction of the perfect stage is common when the leaves fall uponsod and are more or less protected by their own number or bybeing partially covered with grass, etc.. Fk;. 121. Ve.ntukia Pom/, from Wintered Leaves of Apple Control. In the agricultural experiment stations of the UnitedStates spraying experiments have been quite generally conductedlooking toward the prevention of apple and pear scab. Some dif-ferences in treatment have been recommended for regions whereclimatic relations are diverse, but in general the method of treat-ment is much the same. At least one spraying should be madewith strong Bordeaux mixture before blossoming. In Californiait has been recommended to spray twice before the fruit budshave opened; this in case of the pear. A second (or third)spraying may be given immediately after the petals fall, and at ASCOMVCETES 271 least one more two weeks after the second. The conditions, however, must determine the length of time intervening and thenumber of applications made. XLV. BITTER ROT OF THE APPLE AND OTHER FRUITSGlomereUa ntfomaciilans (Plerk.) Spaukl. (S: Von Sch. Blair. J. C. Bitter Rot of Apple

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