. Florists' review [microform]. Floriculture. .^- ,'-- 18 The Florists^ Review December 25, 1919. ing thirty-six commercial varieties was obtained from various sources. From this seed about 1,800 plants were grown to maturity without a single pustule of rust developing. Again, seed gathered from badly infected plants in the field and in the greenhouse, sown and grown in the usual manner, de- veloped no rust whatsoever, even though seed was taken from pods on which rust pustules were present. It can be safely stated that rust is not carried 6n seed nor propagated by seed. Although seeds of
. Florists' review [microform]. Floriculture. .^- ,'-- 18 The Florists^ Review December 25, 1919. ing thirty-six commercial varieties was obtained from various sources. From this seed about 1,800 plants were grown to maturity without a single pustule of rust developing. Again, seed gathered from badly infected plants in the field and in the greenhouse, sown and grown in the usual manner, de- veloped no rust whatsoever, even though seed was taken from pods on which rust pustules were present. It can be safely stated that rust is not carried 6n seed nor propagated by seed. Although seeds of the snap- dragon do not carry the rust from season to season, and seedlings are not easily susceptible to infection, propa- gation by seeds has a disadvantage in , the fact that few strains are fixed, and / selection must be practiced in order to ' have desirable strains. However, the 4 use of seedlings makes it possible to ; ^- eliminate the rust. If in a rust-in- fected house or field all infected plants are burned, and after a lapse of a year or two a new beginning with seedlings is made, clean, healthy plants will re- sult. From such plants good strains can then be developed by means of careful selection. Outdoor Snapdragons. JiJxperiments with snapdragons in the field led to the same conclusion, with reference to the ineffectiveness of fungi- cides, as in the indoor tests. In the majority of cases rust is propagated from season to season in the green- house and is carried from there to the field. During rainy, cloudy seasons in the field, rust will completely kill the plants just before blooming time and by fall the whole planting will be dead. It is important, then, to use only clean plants in the field; this means that the grower must eliminate entirely the rust from the greenhouse before he can be sure that he is using clean stock in the field. A few florists grow snapdragons throughout the year, but the majority prefer to plant in August for an early winter crop or els
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Keywords: ., bookcentury1900, bookdecad, booksubjectfloriculture, bookyear1912
