. The American florist : a weekly journal for the trade. Floriculture; Florists. easily seen by making a section across the stem of an affected carnation. The threads lying in the intercellular spaces send out very slender branches, which eat their way through the cell wall and then become swollen into rounded or lobulated sucking organs or haustoria. Ward* describes sim- ilar haustoria of Heineleia vastatrix, the cause of a uredin- ous coffee tree disease. Figure 6 is from a camera lueida draw- ing showing the haus- toria of Uroniyces caryopliyllinus in the cells of a carnation stem. The rust
. The American florist : a weekly journal for the trade. Floriculture; Florists. easily seen by making a section across the stem of an affected carnation. The threads lying in the intercellular spaces send out very slender branches, which eat their way through the cell wall and then become swollen into rounded or lobulated sucking organs or haustoria. Ward* describes sim- ilar haustoria of Heineleia vastatrix, the cause of a uredin- ous coffee tree disease. Figure 6 is from a camera lueida draw- ing showing the haus- toria of Uroniyces caryopliyllinus in the cells of a carnation stem. The rust attacks the carnation at all stages of its growth, Fig. 6. Cells from the stem of a rusted carnation showing the iutercel- not soar in" the ular mvcpliiim and hanstorin_ Ohiprt tnnn-nifipH ,^fl timpc mnrp fT-ion tVip ^ ^. young cuttings nycelii and haustoria. Object magnified 30 times more than the where I have ob- served it incompanj'withtheanthrac- nose. The cuttings were probably made from a rusted plant which showed no external evidence of the presence of the parasite, but con- spores easily rub off, appearing as a brown powder. Since they are easily scattered about over other plants they are liable to germinate where there is sufficient moisture and infect them. In Fig. 7. Spot (Septoria) ou leaves. From a photograph. tained the threads within the tissues. Probably the best treatment would be to destroy all affected plants, and where possible to remove all soil and dis- infect the surroundings. If it is desirable to try cuttings from any affected or sus- picious plant, the cuttings should be. Fig. 8. Spotj(Septoria) on the^stem'andjeaves. quarantined for at least one season to be sure no disease is lurking in the tissues. "spot" of carnations or "; {Septoria Diaiithi Desm.) The so-called "spot" of carnations is very widely distributed, and probably the cause of more trouble than is generally admitted. Like the rust it has been lon
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfloriculture, bookyea
