FIG. 1.-YOUNG PLANT INJURED BY THE BEAN APHIS (APHIS RUMICIS). FIG. 2.-HEALTHY YOUNG PLANT, SHOWING BENEFITS OF SPRAYING. THE GLOBE ARTICHOKE AND APHIDS. SPRAYED AND UNSPRAYED ROWS OF GLOBE ARTICHOKE. The aphids Myzus braggii and Aphis rumicis have been controlled in the row at left by spraying with nicotine sulphate. The plants in the row at right have not been sprayed. Cutworms, the predominating species apparently being Feltia annexa Treitschke and Agrotis ypsilon Rottemburg, cause some injury, especially during the cooler months of the year when only the smaller developing leaves are present on the plants. Larvæ of two agromyzid flies, Agromyza platyptera Thomson var. jucunda Van der Wulp, and Agromyza sp.,1 have been found mining in the leaves and the membracid Entylia sinuata Fabricius breeds on them. The leaves are also fed upon to some extent by various other insects, among them the larva of the cabbage looper (Autographa brassicae Riley) and the adult of the southern corn rootworm (Diabrotica duodecimpunctata Olivier). 1 Determined by F. R. Cole. In 1914 Mr. I. J. Condit found larvæ of Phytomyza (Napomyza) lateralis Fallén working as leaf miners on globe artichokes at Berkeley, Cal. The reared adults were determined by Mr. Frederick Knab, Bureau of Entomology. |