. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 644 LABORATORY EXERCISES For this and other experiments consult Melhus, T. E.: Culture of Parasitic Fungi on Living Hosts. Phytopathology, ii: 197-203, October, 1912. Pear Blight (Bacillus amylovoriis, Burrill) (Fig. 228).—Take some pear twigs long enough to be accommodated easily under an ordinary bell jar. Cut off these stems under water and transfer to a jar under water, so that the cut ends are not exposed to the air. Then make slanting cuts at the upper end of the twigs with a ster
. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 644 LABORATORY EXERCISES For this and other experiments consult Melhus, T. E.: Culture of Parasitic Fungi on Living Hosts. Phytopathology, ii: 197-203, October, 1912. Pear Blight (Bacillus amylovoriis, Burrill) (Fig. 228).—Take some pear twigs long enough to be accommodated easily under an ordinary bell jar. Cut off these stems under water and transfer to a jar under water, so that the cut ends are not exposed to the air. Then make slanting cuts at the upper end of the twigs with a sterile knife and inoculate the cut ends with the organism. Cover the twigs and jar in which they are placed with a bell jar. as shown in the accompanying. Fig. 227.—Crown gall artificially produced in greenhouse of University of Penn- sylvania by inoculation of Pelargonium zonale with Pseudononas tumefaciens. (Photo by Charles S. Palmer.) illustration. Note the result of the inoculation on the tissue of the twigs and on the health of the leaves. Consult Dugg.^e, B. M.: Fungous Diseases of Plants, pp. 121-129. Lcttticc Drop {SdcTotinia Libertiana, Fuckel.).—Lettuce leaves may be in- oculated by means of the sclerotia of fungus, or bj the mycelium laid upon the sur- face of scarified areas of the leaf. As inoculation produces a virulent form of the disease cmHrol, plants of lettuce should be kept for comparison (Dcggar, pp. 190-200). Wilt of Sweet Corn {Bacterium (Pseiidomonas) Steu'arti E. F. Sm. (Fig. 229).— 1 his organism was furnished on beef agar and is best inoculated by applying small. 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 Harshberger, John W. (John William), 1869-1929. Philadelphia : P. Blakiston's Son & Co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1917
