. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 932 Contribution from the Bureau of Entomology L. O. HOWARD, Chief Washington, D. C. PROFESSIONAL PAPER September 20,1921 LIFE HISTORY OF THE CODLING MOTH IN THE GRAND VALLEY OF COLORADO By B? H. SIEGL,ER, Entomologist, and H. K. PLANK, Scientific Assistant, Fruit Insect Investigations, in Coopera- tion with The Colorado Agricultural Experiment Station CONTENTS Introduction The Grand Valley of Colorado Explanation of Terms . Methods and Rearing Apparatus Era ployed i
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 932 Contribution from the Bureau of Entomology L. O. HOWARD, Chief Washington, D. C. PROFESSIONAL PAPER September 20,1921 LIFE HISTORY OF THE CODLING MOTH IN THE GRAND VALLEY OF COLORADO By B? H. SIEGL,ER, Entomologist, and H. K. PLANK, Scientific Assistant, Fruit Insect Investigations, in Coopera- tion with The Colorado Agricultural Experiment Station CONTENTS Introduction The Grand Valley of Colorado Explanation of Terms . Methods and Rearing Apparatus Era ployed in the Life-History Studies The Insectary Seasonal-History Studies of 1915 Wintering Larvae . . Pupae of the Spring Brood . Moths of the Spring Brood . The First Generation . The Second Generation The Third Generation Codling-Moth Band Studies of 1915 Seasonal-History Studies of 1916 Pupae of the Spring Brood Moths of the Spring Brood The First Generation The Second Generation The Third Generation Codling-Moth Band Studies of 1916 . Natural Enemies of the Codling Moth . Miscellaneous Studies . ..... Effect of Cool Temperatures on Emergence of Moths of the Spring Brood Miscellaneous Studies—Continued Time of Day Moths Emerge ... 84 Codling Moth Flight Trials .... 87 Time of Copulation .... 89 Time of Day Moths Oviposit ... 91 Oviposition by Individual Moths . 99 Deposition of Infertile Eggs .... 106 Time Required for Codling Moth Larva to Leave the Egg . • • 107 Larvae that Fail to Extircate Them- selves From the Chorion .... 107 Habits of Newly Hatched Larvae . 108 The Codling Moth "Sting" . . 108 Codling Moth Larvae Feeding on Pear Twigs 108 Experiments with Black and White Bands 109 Percentage of Transforming and Wintering Larvae Ill Laspeyresia pomonella (L.) var. simpsonii (Busck) Ill Review of Seasonal-History Studies of the Codling Moth in 1915 and 1916 ... 112 Summary 115. JP*&*^&U WASHINGTON GOVERNMENT PRINTING OFFICE 1921. Please note that these
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