. Annals of applied biology. Biology, Economic; Biochemistry. E. J. Welsford 41 to the drying sheds many of the mature worms forsake the scales, no doubt owing to the gradually increasing dryness, and they may be found in bunches among the roots. In this position they are subjected to rapid desiccation and they soon become dormant and fall off, often on to healthy bulbs. If such worms become moistened they revive in a very short time and speedily infect the material around them. Again, if the sheds are warm, the eggs, which have been deposited in the scales, hatch and the larvae attack the tis
. Annals of applied biology. Biology, Economic; Biochemistry. E. J. Welsford 41 to the drying sheds many of the mature worms forsake the scales, no doubt owing to the gradually increasing dryness, and they may be found in bunches among the roots. In this position they are subjected to rapid desiccation and they soon become dormant and fall off, often on to healthy bulbs. If such worms become moistened they revive in a very short time and speedily infect the material around them. Again, if the sheds are warm, the eggs, which have been deposited in the scales, hatch and the larvae attack the tissue in which they are. Fig 3. Diseased bulb showing ring of brown tissue. Fig. 4. Diagrammatic drawing of bulb which has been cut in half longitudinally. Second year of attack. Infection spreading up from plate. « = crinkly leaves growing at right angles to bulb. lying. Dry, cool conditions check the spreading of the disease and prevent the occurrence of fresh infection; unfortunately such condi- tions are difficult to obtain in practice. When diseased bulbs are planted in the autumn a certain proportion of them die and liberate eelworms which infect their neighbours. Those which survive start growing earlier than healthy bulbs (Fig. 5), and in the spring often produce one or more curved leaves showing crinkled. 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 Association of Applied Biologists; Association of Economic Biologists. [Wellesbourne, Warwick, etc. ] Association of Applied Biologists [etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiochem, bookyear1918
