. Florists' review [microform]. Floriculture. Infected' Snapdragon Plant. I Mycelium Appears on St«'in aiut at Base.) about ten or twelve diseased plants in the bench. At Easter there was a like number. The disease was not confined to one particular spot in the benches, al- though at one place there were six dying or dead plants. The fact that this dis- ease was spread over a 300-foot bench seems to indicate that it was brought in either in the soil or the manure. How It Acts. The first indication of trouble is a wilting of the plant or of a part of the plant. In many instances one branch will
. Florists' review [microform]. Floriculture. Infected' Snapdragon Plant. I Mycelium Appears on St«'in aiut at Base.) about ten or twelve diseased plants in the bench. At Easter there was a like number. The disease was not confined to one particular spot in the benches, al- though at one place there were six dying or dead plants. The fact that this dis- ease was spread over a 300-foot bench seems to indicate that it was brought in either in the soil or the manure. How It Acts. The first indication of trouble is a wilting of the plant or of a part of the plant. In many instances one branch will wilt, followed in a few days by wilt- ing of the whole plant, succeeded by death. The infected branches, or the main stem, or both, turn brown. If the grower looks closely he will usually see a white cotton-like material clinging to the brown, dead stem tissue. This is the mycelium, or vegetable portion of the •fungus, which has entirely permeated the stem and has finally burst through the bark. This cottony growth is not al- ways visible when the plant dies. How- ever, it appears if the plant is allowed to remain in the bench for several days after death. One of the illustrations shows a plant which was artificially in- oculated with the disease, from pure culture. The fine, thread-like mycelium can plainly be seen at the base of the plant and on the stem. The wad of cot- ton, which was used to hold down evap- oration and keep in moisture at the base of the plant, is also visible on the soil. If the plant is undisturbed, small, hard, black bodies of irregular and vary- ing shape develop, ranging from the size of a shot to the size of a pea. These bodies are called sclerotia. They develop both on the outside and in the interior of the diseased stems. The larger num- ber of these sclerotia will be found in the pithy, brown stem by carefully splitting the branch. One of the photographs shows vertical sections of diseased stems containing these bodies. Determining the Disease.
Size: 1158px × 2158px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecad, booksubjectfloriculture, bookyear1912
