. The American florist : a weekly journal for the trade. Floriculture; Florists. tm- The American Florist. 889. NEPHROLEPIS SCOTTII AT THE NEWPORT EXHIBITION.—See page : CHRYSANTHEMUMS Roller Worm Defies Hydrocyanic Acid. Ed. Am. Florist:—We have been troubled in two chrysanthemum houses with roller worms on the plants; these two houses failed of being completely emptied before planting, so that they did not undergo their usual fumigation with burnt sulphur. Finding hand-picking slow and laborious we decided to try to kill the roller with hydrocyanic acid. We got down our technical books, Prof
. The American florist : a weekly journal for the trade. Floriculture; Florists. tm- The American Florist. 889. NEPHROLEPIS SCOTTII AT THE NEWPORT EXHIBITION.—See page : CHRYSANTHEMUMS Roller Worm Defies Hydrocyanic Acid. Ed. Am. Florist:—We have been troubled in two chrysanthemum houses with roller worms on the plants; these two houses failed of being completely emptied before planting, so that they did not undergo their usual fumigation with burnt sulphur. Finding hand-picking slow and laborious we decided to try to kill the roller with hydrocyanic acid. We got down our technical books, Professor Troop's latest bulletin, consulted our chemistry, also our druggist, and made all arrangements to fill the houses with gas at night after all the employes had left. At the last moment, af^er looking over the plump buds and grand foliage, we weakened and decided to try our first large experiment on a house of benched roses, into which a few pot plants ol chrysanthemums should be brought. We had the stone jars arranged along the walk, and first combined the sul- phuric acid with the water. The little packages of potassium cyanide were tied to weights on fine wires and dropped into the stone jars from the outside of the house, which had been made quite air-tight. The house was allowed to re- main closed for a full three-quarters of an hour, and the next morning we anxiously investigated for results. We found the black aphis just as dead as if we had fumigated with tobacco, the green aphis a little more so, but the roller worms were gayly gambolling about their gauzy tents, not a soul of them in- jured to all appearance. The chrysanthe- mums and a few large plants of Aloysia citriodora had their soft tips burned, and the tender growths of only those roses exposed to the direct fumes of the gas were scorched. The gas was evi- dently strong enough to injure stock, but was not strong enough even to touch the roller worm. This is not wiitten to criticize the lor- mulas given,
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfloriculture, bookyea
