. The American florist : a weekly journal for the trade. Floriculture; Florists. 18 The American Florist. Jan. 2S,. Fig. 9. Septoria, section through one of the conceptacles. Magnified 30 times more than the scale. treatment would be to destroy all affected plants, and where possible to remove all soil and disinfect the sur- roundings. If it is desirable to try- cuttings from any affected or suspi- cious plant, the cuttings should be quarantined for at least one season to be sure no disease is lurking in the tissues. "spot" of oaenations OB "; (Septoria Dianthi Desm.
. The American florist : a weekly journal for the trade. Floriculture; Florists. 18 The American Florist. Jan. 2S,. Fig. 9. Septoria, section through one of the conceptacles. Magnified 30 times more than the scale. treatment would be to destroy all affected plants, and where possible to remove all soil and disinfect the sur- roundings. If it is desirable to try- cuttings from any affected or suspi- cious plant, the cuttings should be quarantined for at least one season to be sure no disease is lurking in the tissues. "spot" of oaenations OB "; (Septoria Dianthi Desm.) The so-called "spot" of carnations is very widely dis- tributed, and prob- ably the cause of more trouble than is generally admitted. Like the rust it has been long known in Europe and has been several times men- tioned in this coun- try. The disease pos- sesses certain char- acteristics which en- able one to distin- guish it quite easily from other leaf troubles of the car- nation, but when it attacks the stem it is apt not only to produce injury which to most observers might seem greater than the external evi- dence would indi- cate, but also to in- duce secondary dis- turbances which re- sult in killing the plant or preventing the full opening of the flowers. Fig- ures 7 and 8 represent respectively a pen drawing and photograph of the spots on the stem and leaves. The spot is usually characterized by a nearly circular or oblong dirty white or brownish center bordered by a dark band purplish in color. This band is well defined on its inner edge where it joins the center but is usually lUde- flned and diffused with the green of the leaf on its outer edge. The whitish center of the spot is dotted here and there with minute black points, which are portions of the fruiting concep- tacles projecting through the epidermis to the outer surface. Frequently the spot is on the margin of the leaf when Fig. 10. Septoria Spores. it is semicircular in form. Occasion- ally the s
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfloriculture, bookyea
