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100 per cent abundant alfalfa field artificially ascospores attack avenaceum bacterium barley heads blight infection blighted heads blighted wheat heads blossoming causal organism cause blighting cereal crops coleoptile color cornstalks culmorum degree of infection discoloration dough stage favorable formed fungi fungus Fusarium conidia Fusarium species Fusarium-blight Gibberella saubinetii glumes grown plants head infection headblight heads of wheat healthy host hyphae infected area infected heads inoculation isolated from blighted July July 17 kernels lodged wheat field masses of conidia mercuric chlorid moist moisture mycelium Naumov node number of blighted oats parasitic pathogenicity perfect stage perithecia pionnotes plates plots point of infection pots produced rachis rootrot rotting and browning Sacc saubinetii conidia SCAB Schaffnit seed Selby sheaths showed sown species of Fusarium spelt spikelets infected spores sporodochia sterile soil symptoms test tube tissues underground portions usually varieties variety planted water-soaked whole head killed wilting Wisconsin Wollenweber young seedlings
Page 1 - Maine, through the courtesy and at the expense of the Office of Cereal Investigations. Bureau of Plant Industry. United States Department of Agriculture. * Reference is made by number (italic) to "Literature cited,
Page 15 - Wollenweber give the following diagnosis : " Perithecial stage : Perithecia scattered or gregarious, free on the surface of the host, as well as embedded in mycelium or on a distinct plectenchymatic stroma, ovoid, subconical, sub-flask-shaped ; averaging 225...
Page 31 - Wheat: Soil troubles and seed deterioration. Causes of soil sickness in wheat lands. Possible methods of control. Cropping methods with wheat.
Page 16 - Peridium strongly verrucose, owing to protuberance-like projections of cell groups, red to reddish brown, except the almost colorless conical beak. A few paraphyses line the inner wall of the throat from the ascus ball to the ostiolum. Asci up to over a hundred in each perithecium, intermixed with a few more celluled paraphyses.
Page 22 - skin" was peeled off just above the affected part, or the diseased part of the plant was broken open so that the spot from which the isolation was to be made was not touched even with sterile utensils.5 Four or five small fragments of diseased tissue were cut out with a sterile scalpel and transferred with a sterile needle to cooled poured plates of a suitable medium. When a rotted tuber showed a noticeable difference, in color or otherwise, in different regions of the decayed part, a separate set...
Page 2 - It is not a wheat disease alone, because it also occurs on spelt, rye, barley, oats, and certain grasses. And it is not "scab...
Page 9 - ... visible. Badly diseased cobs failed to develop normal kernels. Occasionally one side of a cob was found to be more seriously affected than the other. In such cases the kernels on one side of the cob developed to normal size while those on the other side were sinall, shriveled, or did not develop at all.
Page 15 - The chief cause of headblight and one of the chief causes of rootrot of the cereal crops in the United States is Gibberella saubinetii (Mont.) Sacc.
Page 11 - Atanasoff (j) in 1918, when it was demonstrated that the hyphae present in the previously infected heads or cornstalks remain viable till spring, when they form new conidia and thus help the further propagation of the fungus.