. Bakterien in Bezug auf Pflanzenkrankheiten. Bakteriologie; Pflanzenkrankheiten. Willst von KÜRBISGEWÄCHSEN. 251. ^/looinm m s grün Keimblatt aus der Gestochenen Blatt von einem Abstand von 2 cm voneinander getrennt., war auch verwelkt. Um 16.00 Uhr des gleichen Tages die Rebe wurde in das Labor gebracht und fotografierte zusammen mit einer gesunden Rebe des gleichen Alters (Vol. I, Abb. 8). Das erste Blatt unter dem gestochen, einer war für Bazillen in den Venen der Blade untersucht. Sie waren vorhanden, aber noch nicht zahlreich. Das Blatt-Blatt verwelkt gewesen war und nicht mehr als 25 Stunden (Samples in Alkohol für die mikrotom gesetzt wurden). Die Klinge der Firs

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. Bacteria in relation to plant diseases. Bacteriology; Plant diseases. WILT OF CUCURBITS. 251. ^/looinm m s green cotyledon separated from the pricked leaf by a distance of 2 cm., was also wilted. At 4 p.m. of the same day the vine was brought into the laboratory and photographed along with a healthy vine of the same age (Vol. I, fig. 8). The first leaf below the pricked one was examined for bacilli in the veins of the blade. They were present but not yet numerous. The leaf-blade had been wilted rather more than 25 hours (samples were put into alcohol for the microtome). The blade of the first leaf up which was normal at 3 p. m. the previous day but had wilted either the morning of the seventh day or the previous night, was also examined: The spiral vessels at the apex of the petiole contained numerous bacilli. The veins of the blade were not examined but samples were put into alcohol for sections. Bacteria were also found in the vessels of the uppermost small leaf at the junction of blade and petiole. The petioles of these leaves (pricked one included) were rigid and neither these nor the stem had changed color. For the appearance of a single infected bundle in cross-section see fig. 69. For appearance of a whole petiole in cross- section with low magnification consult Vol. I, pi. 3. (151.) Cucumber var. White wonder (Cmcmotm ifl/wMj). Many pricks were made in a basal lobe of a leaf about 2.25 inches across. The morning of the fifth day the first slight trace of the wilt appeared in the pricked part of the leaf. At 2 p. m. the wilted part was duller green and covered an area of nearly i sq. cm. in the middle of the pricked part. The following day (3 p. m.) there was only a small increase of the wilt: Not one-twentieth of the leaf-blade was involved. The eighth day about one-fourth of the pricked leaf was flabby and the middle of the diseased area was now brown and dry. The following day the pricked side of the leaf was dry-shriveled and the rest of the blade had w

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