. Bulletin of the Department of Agriculture. Agriculture. BULLETIN No. 843 ^ i yL^'^'«-r<^ Contribution from tiie Bureau of Entomology L. O. HOWARD, Chief. j)J^'<^WU Washington, D. C. PROFESSIONAL PAPER June 7, 1920 THE BEAN LADYBIRD. By F. H. Chittenden, Entomologist in Charge, and H. O. Marsh, Entomological Asftistant, Truck-Crop Insect Investigations. With a report on "The Bean Ladybird in Colorado, in ; By A. C. Mallory, Scientific Assistant. CONTENTS. Introduction i^ynonymy Dfscription The adult The egg The larva The pupa Distribution Danger of future spread Life
. Bulletin of the Department of Agriculture. Agriculture. BULLETIN No. 843 ^ i yL^'^'«-r<^ Contribution from tiie Bureau of Entomology L. O. HOWARD, Chief. j)J^'<^WU Washington, D. C. PROFESSIONAL PAPER June 7, 1920 THE BEAN LADYBIRD. By F. H. Chittenden, Entomologist in Charge, and H. O. Marsh, Entomological Asftistant, Truck-Crop Insect Investigations. With a report on "The Bean Ladybird in Colorado, in ; By A. C. Mallory, Scientific Assistant. CONTENTS. Introduction i^ynonymy Dfscription The adult The egg The larva The pupa Distribution Danger of future spread Life history and habits Seasonal history Reproduction and development- History and literature Unpublished records Natural control Effect of climatic conditions Natural enemies Page. 1 2 2 3 4 4 5 5 7 7 7 10 11 13 13 14. Page. Preventive measures 15 Hand picking and brushing 15 Clean cultural methods 15 Early and late planting 15 Direct measures of control 16 Experiments with insecticides__ 16 Cooperation IS Summary of control measures-_ 18 General summary 18 Literature cited 20 The bean ladybird in Colorado in 1919 Life-history records Injury Control 21 21 23 INTRODUCTION. In the semiaricl region of the Southwest, where an immense acreage of beans is grown annually, a destructive insect known as the bean ladybird, bean beetle, " bean bug," and spotted bean beetle ^ does great injury. Indeed, it is to the bean crop what the Colorado potato beetle is to the potato, a pest of the highest importance in the region which it inhabits. The beetle devours all parts of the bean plant—leaves, flowers, and growing pods. Its main food supply, however, is the leaves, through which it cuts irregular holes (PI. I; III; IV, fig. 1). Its injuries, ^ Epilachna corrupta Muls. ; order Coleoptera, family Coccinellidae. Note.—This insect was under the observation of the junior author (who died Sep- tember 10, 1918), from 1914 to 1917. The life-history investigations were conducted in an op
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