652 EXPERIMENT STATION EECOED. 



A new sawfly (W. paciflcus), first observed iu the winter of 1913, is reported 

 to be ttie source of some damage to cherry trees. The larvse of the radish 

 weevil (C. sparsus) tunnel about inside the radish, devomnng the whole interior 

 of a small plant, and rendering it unfit for food. Tipulid larvje (C. angwiti- 

 prnnis) were observed tunneling in the decayed wood of prune trees in an 

 orchard near Corvallis, and the injury, while secondary in nature, is said to 

 he fairly serious since it shortens the life of tlie infested trees. 



Tomato insects, root knot, and "-white mold," J. R. Watson (Florida Sla. 

 Bill. 125 (1914), pp. 55-78, figs. 1/f). — A brief popular account is given of the 

 more Important insect enemies of tomatoes in Florida and of root knot and 

 white mold and means for their control. 



Three cornered alfalfa hopper. V. L. Wildermuth (U. .S'. Depf. Agr., Jour. 

 Agr. Rvsmrch, S {J915), No. J,, pp. 3Jf3-362, flg. i).— This membracid {Stictoce- 

 phaia fesiinu), first described in 1831 by Say, has become of economic impor- 

 tance to alfalfa crops in the irrigated valleys of the .southwestern United 

 States and to alfalfa and cowi>eas in the Southern States. Injury is due to the 

 sucking of plant juices by both adults and the larvse and the development of a 

 feeding scar which often takes the form of a ring or girdle and which is usually 

 accompanied by a gall formation. 



In this paper the author deals with its specific identity, distribution, and 

 food plants; presents descriptions of its several stages; and reports studies of 

 its life history and habits, seasonal history, damage to alfalfa and other plants, 

 natural enemies, and preventive measures. 



" Plants of the legume family constitute the favorite food. The eggs are de- 

 posited in the stems of the food plants, usually back of the sheath leaves or 

 below the surface of the ground. In cowpeas the eggs are deposited in pockets 

 on the stems. The egg period in Arizona occupies from 12 to 41 days and the 

 five stages of the nymphal period from 22 to 69 days. The average combined 

 length for both periods is about 50 days. In southern Arizona there are four 

 generations annually and during extremely mild winters the adult insects are 

 active thi'oughout the season. During colder winter the .species hibernates in 

 both the egg and adult stages. 



" The alfalfa hopper is little affected by natural enemies and is only reduced 

 in numbers by the variable winter temperatures. The Sonoran redwing 

 [Agelaius phceniceus margineJIa] was found to feed upon the species. The 

 cleaning up of places of hibernation and the eradication of weeds, rubbish, etc., 

 is the only known system that will reduce the numbers of the pest." 



A bibliography of 11 titles is included. 



Control of green pea aphis in 1914 (Macrosiphum pisi), L. B. Smith (Vir- 

 ginia Truck. 8ta. Bui. 13 (191.',), pp. 301-312. fig. 7).— This is a report of exi^ri- 

 ments with control measures for one of the most troublesome and destructive 

 insects with which truck growers in tidewater Virginia have had to contend. 

 The results of spraying experiments lead the author to recommend the use 

 of either of the following formulas: Blackleaf 40 10 oz., whale-oil soap 4 lbs., 

 and water 50 gal. ; or whale-oil soap 5 lbs. and water 50 gal. The spray should 

 he applied within one or two days after the aphidids are found on the pea vines 

 and two or three sprayings may be necessary especially if the aphidids are 

 very numerous. The second spraying should come about one week after the 

 first. The growing of clover, especially crimson clover, in the vicinity of the 

 pea field should be avoided if possible since this species passes approximately 

 eight months of the year on clover. 



The life history and habits of the corn earworm (Chloridea obsoleta), H. 

 Garman and H. H. Jewett (Kcuturki/ Sta. Bui. 187 (19^), pp. 513-591, p/v. 

 13, figs. 3). — Observations of the boUworm or com earworm in Kentucky were 



