. The American florist : a weekly journal for the trade. Floriculture; Florists. CONCRETE BENCHES AND WALKS IN GREENHOUSE. as a fungicide in destroying epiphytic fungi, particularly the powdery mildews of the rose, vine, hop, etc., is well known. Sulphur is also sometimes used in destroying the spores of endophytic fungi, or at least in preventing their growth. As a fungicide sulphur is used or applied in several ways. (1) In the sublimed form or flowers of sulphur, it is dusted on the plants. (2) Both sub- limed sulphur and ground roll-sulphur, brimstone or flour of sulplnir, are mixed with w
. The American florist : a weekly journal for the trade. Floriculture; Florists. CONCRETE BENCHES AND WALKS IN GREENHOUSE. as a fungicide in destroying epiphytic fungi, particularly the powdery mildews of the rose, vine, hop, etc., is well known. Sulphur is also sometimes used in destroying the spores of endophytic fungi, or at least in preventing their growth. As a fungicide sulphur is used or applied in several ways. (1) In the sublimed form or flowers of sulphur, it is dusted on the plants. (2) Both sub- limed sulphur and ground roll-sulphur, brimstone or flour of sulplnir, are mixed with water to form a paste, which is applied to the heating pipes in green- houses, the finely divided vaporized sul- phur thus produced collecting on the plants; or small pieces of roll-sulphur may be carefully heated on a sand bath, the finely divided vaporized sulphur be- ing distributed in the same way; or sul- phur in the form of an impalpable pow- der known as ventilated sulphur may be used, as in Germany and Italy where it is used for fighting the vine blight. (3) Sulphur is also applied in combination with lime in the form of solution, as in the lume-sulphur washes, tliese being solutions of a number of sulphides and lower sulphates of calcium. Sulplnir is insoluble in water and is not affected by most reagents under or- dinary conditions, ana of itself could not be considered to have fungicidal properties. Nor is it likely that it ex- erts a mechanical action like certain of the insecticides, as pyrethrum flowers, or insect powder, which act by closing the breathing pores of the insects. The action of sulphur as a fungicide is prob ably due. then, to certain compounds of sulphur which result from the manner of using it. It is generally considered by plant pathologists rhat when sulphur is used in a powdered form as a remedy for plant diseases, the effects are due to sulphur dioxide. While sulphur dioxide ficiency of powdered sulphur when dusted on plants is in direct ratio t
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