Manual of vegetable-garden insects . y a uniform greenish yellow,without the darker lines found onthe forms on the peach, or plum(Fig. 66). When the plant becomesFig. 66. —Wingless viviparous crowded, winged forms (Fig. 67) are female spinach aphis (X 11). , i i • i • pi produced which migrate to new feed-ing grounds. The insects are most destructive to spinachlate in the season when the cooler weather prevents the rapidmultiplication of their predaceous and parasitic enemies,although they may become troublesome at any time. In thefall some of the winged females return to the peach, j^hmi ( rc
Manual of vegetable-garden insects . y a uniform greenish yellow,without the darker lines found onthe forms on the peach, or plum(Fig. 66). When the plant becomesFig. 66. —Wingless viviparous crowded, winged forms (Fig. 67) are female spinach aphis (X 11). , i i • i • pi produced which migrate to new feed-ing grounds. The insects are most destructive to spinachlate in the season when the cooler weather prevents the rapidmultiplication of their predaceous and parasitic enemies,although they may become troublesome at any time. In thefall some of the winged females return to the peach, j^hmi ( rcherry, establish themselvesalong the veins on the un-derside of the lea^?es andgive birth to true or ovipa-rous females. The latter areusually of a pinkish color,similar to the stem-mothersof the preceding pairing with the winged males, they deposit their eggs in the axils of the budsand in crevices of the bark. The eggs are small, oval andshining black, and closely resemble those of the common greenapple Fig. 67. — Winged viviparous femalespinach aphis (X 7^). BEET AND SPINACH INSECTS 107 Control. The spinach aphis is readily killed when hit by spraying withBlack Leaf 40 tobacco extract, 1 pint in 100 gallons ofwater to which 5 or 6 pounds of soap have been added. Onspinach, however, and other plants the leaves of which lie closeto the ground, it is not easy to obtain satisfactory controlowing to the difficulty of wetting the underside of the leaveswith the spray. References Taylor, Jour. Eeon. Ent., 1, pp. 83-91. Agr. Exp. Sta. Bull. 133, pp. 32-37. Truck Sta. Bull. 2, i)p. 30-32. 1909. Other Beet and Spinach Insects Southern corn root-worm : 222 CaV)bage looper: 8 Cabbage webworm : 16 Garden webworm : 18 Harlequin cabbage bug : 38 Serpentine leaf-miner : 4() False ehinch-bug: 47 Yellow bear caterpillar : 3)7 Carrot beetle: 185 Celery leaf-tyer: 189 Celery looper: 191 Adelphocoris rapidus: 195 Western twelve-spotted cucumb
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