. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE m BULLETIN No. 907 mm *jf ^j^jMi* Contribution from the Bureau of Entomology j&^&SU L. O. HOWARD, Chief. —a©->-Y— Washington, D. C. PROFESSIONAL PAPER October 20, 1920 FUMIGATIOxN OF CITRUS PLANTS WITH HYDRO- CYANIC ACID: CONDITIONS INFLUENCING INJURY. By R. S. Woglum,1 Entomologist, Tropical and Subtropical Fruit Insect Investigations. CONTENTS. Introduction 1 The effect of hydrocyanic acid on plants 2 Details of experiments 3 The effect on plant injury of temperature
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE m BULLETIN No. 907 mm *jf ^j^jMi* Contribution from the Bureau of Entomology j&^&SU L. O. HOWARD, Chief. —a©->-Y— Washington, D. C. PROFESSIONAL PAPER October 20, 1920 FUMIGATIOxN OF CITRUS PLANTS WITH HYDRO- CYANIC ACID: CONDITIONS INFLUENCING INJURY. By R. S. Woglum,1 Entomologist, Tropical and Subtropical Fruit Insect Investigations. CONTENTS. Introduction 1 The effect of hydrocyanic acid on plants 2 Details of experiments 3 The effect on plant injury of temperature, light, and moisture before fumigation 4 The effect on plant injury of temperature, light, and moisture after fumigation 10 The effect on plant injury of temperature, light, and moisture during fumigation 22 Page General discussion of factors which influence fumigation ~ 27 The concentration of the gas 28 The length of exposure 29 The physiological condition of the plant 30 Atmospheric and light conditions 33 Summary 41 Literature cited 42 INTRODUCTION. The important factors long known to modify damage to the fruit and foliage of citrus trees under orchard conditions of fumigation with hydrocyanic acid include temperature, moisture, light, and physiological condition of the plant. Of these, light appears to have more completely influenced the application of this gas than any other factor and early confined fumigation to a night practice. Coquillett OS),2 the originator of orchard fumigation with hydro- cyanic acid, found early in his studies that citrus trees were less liable to injury by this gas when treated at night than in daytime, and explained that this result was due to decomposition of the gas by light and heat into other gases more injurious to the plants. Gossard (7), working with citrus trees in Florida, stated that "mid- day fumigation can hardly be ; More recently Fernald, Tower, and Hooker (5), experimenting with cucumbers and to
Size: 1686px × 1482px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
