. Bulletin of the Department of Agriculture. Agriculture. fc-l* -iA»o£CTi» -' UNITED STATES DEPARTMENT OF AGRICULTURE 1 BULLETIN No. 703 i^aitSr Contribution from the Bureau of Entomology % J&P'^&U L. O. HOWARD, Chief ^??**&^U. WASHINGTON, D. C. V November 20, 1918 MISCELLANEOUS TRUCK-CROP INSECTS IN LOUISIANA. I.—INSECTS INJURIOUS TO THE GLOBE ARTICHOKE IN LOUISIANA. By Thos. H. Jones, Entomological Assistant, Truck-Crop Insect Investigations. INTRODUCTION. Insect injury to the globe or burr artichoke {Cynara scolymus) apparently has received little attention from American ec
. Bulletin of the Department of Agriculture. Agriculture. fc-l* -iA»o£CTi» -' UNITED STATES DEPARTMENT OF AGRICULTURE 1 BULLETIN No. 703 i^aitSr Contribution from the Bureau of Entomology % J&P'^&U L. O. HOWARD, Chief ^??**&^U. WASHINGTON, D. C. V November 20, 1918 MISCELLANEOUS TRUCK-CROP INSECTS IN LOUISIANA. I.—INSECTS INJURIOUS TO THE GLOBE ARTICHOKE IN LOUISIANA. By Thos. H. Jones, Entomological Assistant, Truck-Crop Insect Investigations. INTRODUCTION. Insect injury to the globe or burr artichoke {Cynara scolymus) apparently has received little attention from American economic entomologists. While the artichoke has not as yet attained the rank of an important food plant in the United States, the demand for the edible heads is increasing in the markets. The crop is grown in Louisiana, and since the fall of 1914, when the writer was assigned for work on truck-crop insects, in cooperation with the Louisiana Experiment Stations, many growers have complained of insect in- jury to the plants. The most serious damage to the globe artichoke in Louisiana is caused by two species of plant-lice, or aphids, Myzus braggii Gil- lette and Aphis rumicis Linnaeus, both usually occurring in the same field and being most numerous during the late winter and in the spring. INJURY CAUSED BY THE ARTICHOKE APHIS, MYZUS BRAGGII. The artichoke aphis is the most common and, generally speaking, the most injurious insect enemy of the globe artichoke in Louisiana. It occurs in great abundance on the under sides of the leaves and its green color harmonizes with that of the leaf. In cases of severe infestation its presence brings about a condition such as that de- scribed in the following letter sent in by a correspondent in Rapides Parish: " Please let me know what to do for burr artichoke plants attacked by a dark smut which attracts large flies and bees. I had 1 58681°—18—Bull. 703 1. Please note that these images are extracted from scanned page images that
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