571 



peach moth [Cydia molesta] is not definitely known to occur in the 

 State outside of the northern counties within a radius of 50 miles of 

 Washington City. 



SmulyAxV (M. T.). The Rosy Apple Aphis ( Aphis malifoliae, Fitch). — 

 Ann. Repl. Virginia Poly. Inst. Agric. Expt. Sta., 1918-1919, 

 Blackshurg, 1920, pp. 38-64, 3 figs. [Received 1st October 

 1921.] 



Of the three Aphids attacking apples in Virginia, Aphis pritnifoliae , 

 Fitch (apple grain aphis), A. pomi, De G. (green apple aphis) and 

 A. malifoliae, Fitch (rosy apple aphis), the latter is the most injurious. 

 It apparently occurs wherever apple trees are grown. A key is 

 given to distinguish the first instar stem-mothers of the three species 

 [R.A.E., A, vi, 298], and descriptions are also given of all the stages 

 of A. malifoliae. 



The life-historv as occurring in Virginia at a comparatively high 

 altitude— 2,400 feet— is described [cf. R.A.E., A, iv, 340; v, 50], 

 and details are given of the length of life in each individual stage. 

 The natural enemies of A. malifoliae include the Hymenopterous 

 parasites, Lysiphlehits testaceipes, Cress., Ceraphron sp., Asaphes 

 americana, Gir., Pyopachvnetironia siphonophorae, Ashm., Pachyneuron 

 spp., P. virginicum, Gir., Aphidius phorodontis, Ashm., Lygocents 

 stegmaius, Say, Tetrastichodes detrimentosus, Galian ; the Coccinellids, 

 Adalia bipundala, L., Cycloneda niunda, Say, Hippodamia convergens, 

 Guer., Coccinella novemnotata, Hbst., Psyllohora vigintimactdata, Say, 

 Anatis quindecimpunctata, Oliv., Megilla fuscilahris, Muls., Chilocoriis 

 bividnerus, Muls., Scymnus collaris, Muls. ; a Dipterous parasite, 

 Leucopis griseola. Fall. ; and Chrysopa sp. 



During 1916 experiments were carried on to test the value of a single 

 spraying with nicotine sulphate, 40 per cent., at the rate of f U.S. pint 

 in 100 U.S. gals, of water with the addition of 3-5 lb. of soap applied 

 at the time the buds showed green, or of a single spraying with nicotine 

 at the same rate in the dilute lime-sulphur at the time the blossom 

 buds showed pink, or with both treatments combined. Of the effect 

 of these sprays on A. malifoliae very little can be said, but A. prnni- 

 foliae may be controlled by one application of nicotine sulphate (40 

 per cent.) in water (1 to about 1,000) and soap (4 lb. to 100 U.S. gals.), 

 about the time the green buds begin to unfold and the Aphids are all 

 hatched. There is apparently no advantage in applying later sprays 

 of nicotine sulphate in lime-sulphur. Subsequent experiments confirm 

 these observations. A . prunifoliae does not affect the yield or quality 

 of the fruit, and may therefore be regarded under normal conditions 

 as causing little if any injury to apples. The preference shown by 

 it for flowers and flower-clusters may, however, make it an important 

 factor in the dissemination of fire blight (Bacillus amylovonts). 



Chittenden (F. H.). The European Horse-radish Web worm.— L^ 5 . 



Dept. Agric., Washington, D.C., Bull. 966, 25th August 1921, 

 10 pp., 8 figs. [Received 1st October 1921.] 



Evergestis straminalis, Hb. (European horse-radish webworm) 

 occurs in the northern United States on horse-radish and less often 

 on turnips and cabbage. The various stages are described. Hiber- 

 nation occurs in the larval stage in the pupal cell near the surface of 

 the ground. The moths appear about May. The eggs, laid in masses 



