. Bulletin of the Department of Agriculture. Agriculture. jS^^twL BULLETIN No. 513 Contribution from Bureau of Entomology. L. O. HOWARD, jj^"^L Washington, D. C. March 10, 1917 FUMIGATION OF ORNAMENTAL GREENHOUSE PLANTS WITH HYDROCYANIC-ACID GAS. By E. K. Sasscer, Collaborator, and A. D. Borden, Scientific Assistant. CONTENTS. Introduction 1 Equipment necessary for fumigation 2 Preparation of house for fumigation 3 Method of computing the cubical contents of even and three-quarter-span 4 Time for fumigation 4 Chemicals required for fumigation 5 Determining the a
. Bulletin of the Department of Agriculture. Agriculture. jS^^twL BULLETIN No. 513 Contribution from Bureau of Entomology. L. O. HOWARD, jj^"^L Washington, D. C. March 10, 1917 FUMIGATION OF ORNAMENTAL GREENHOUSE PLANTS WITH HYDROCYANIC-ACID GAS. By E. K. Sasscer, Collaborator, and A. D. Borden, Scientific Assistant. CONTENTS. Introduction 1 Equipment necessary for fumigation 2 Preparation of house for fumigation 3 Method of computing the cubical contents of even and three-quarter-span 4 Time for fumigation 4 Chemicals required for fumigation 5 Determining the amount of cy anid to be used. 5 Chemical formula t o be employed 6 Mixing the chemicals 7 Number of generators to be employed 7 Exposures 7 Ventilation after fumigation 8 Effects of weather conditions on 8 Advisability of a fumigation box i) How insects are disseminated from house to house 9 Cost of hydrocyanic-acid gas fumigation 10 Precautions 11 Plants and insects fumigated in 11 Plants and insects fumigated in fumigation box 18 Conclusion 20 INTRODUCTION. Hydrocyanic-acid gas, if intelligently employed, is one of the cheapest and most efficient methods of controlling thrips, aphids, white flies, and various scale insects on plants grown under glass. That this method of control has not been generally adopted is no doubt owing to the deadly poisonous nature of the gas if inhaled, its disastrous effect on tender plants if improperly used, and the pre- Note.—Hydrocyanic-acid gas was first used against greenhouse pests in 1S95 by Messrs. A. F. Woods and P. H. Dorsett (see Circular No. 37, Bureau of Entomology, U. S. Department of Agriculture) in an effort to destroy insects on diseased plants under observation. Subsequently others have employed the gas in greenhouse fumigation, but with varying success, largely because of inexperience and improper methods of procedure. In the earlier experiments in greenhouses conducted by the Bureau of Entomology the
Size: 1863px × 1341px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
