388 



thejleaves become rolled, two or three sprayings, at one week's interval, 

 should be given to the plants, using 2 lb. lead arsenate to 50 U.S. 

 gals, water. After the crop is gathered, the plants should be entirely 

 cut down and burned. 



Waid (C. W.). Tomato Growing in Michigan. — Michigan Agric. Expf. 

 Sta., East Lansing, Spec. Bull. no. 89, March 1918, 18 pp. 9 figs. 

 [Received 13th July 1918.] 



The insects mentioned in this bulletin as pests of tomatoes are 

 cutworms, for which poisoned bran mash is advocated, the potato 

 beetle [Leptinofarsa deceniUneata], blister beetles and flea-beetles, 

 which can usually be killed by dusting with 1 part dry powdered 

 lead arsenate diluted with 5 or 6 parts of flour, hydrated lime, air 

 slaked lime or any other inert powder to serve as a carrier. This 

 must be applied as soon as the larvae. begin to appear. In planting 

 out tomatoes in the field, care should be taken that there are no 

 nymphs or immature forms of white-flies [Ahurodes] present on the 

 plants. 



Parrott (P. J.) & Glasgow (H.). The Radish Maggot. — New York 

 Agric. Expt. Sta., Geneva, N.Y., Bull. no. 442, November 1917, 

 pp. 693-715, 8 plates, 2 figs. [Received 13th July 1918.] 



In this bulletin, Phorbia brassicae, Bch. (radish or cabbage maggot) 

 is dealt with in its relation to radish culture. The adult flies appear 

 during early May ; eggs are laid on the ground within 3 to 5 days ; 

 these hatch and the larvae begin their attacks on the roots of radish 

 plants, the damage generally being most evident during June. In 

 favourable conditions there are three broods and perhaps a partial 

 fourth. Early sowing of the crop, so that it may be harvested before 

 the period of danger from the maggots, is recommended, provided 

 that favourable weather and soil conditions exist. For the protection 

 of these early-sown radishes, frames covered with cheesecloth of 

 20 to 30 mesh have given excellent results, both protecting the plants 

 from Phorbia brassicae and from flea-beetles [PhyJlotreta vittata, F.), 

 and producing finer plants than those grown in open beds. 



Robinson (R H.). The Calcium Arsenates. — Oregon Agric. Coll. Ex-pt. 

 Sta., Corvallis, Bull. 131, June 1918, 15 pp. 



The information contained in this bulletin has previously been 

 abstracted from another source [see this Review^ Ser. A, vi, p. 338]. 



Newcomer (E. J.). Some Stoneflies Injurious to Vegetation. — 

 Jl. Agric. Research, Washington, D.C., xiii, no. 1, 1st April 1918, 

 pp. 37-41, 3 plates. [Received 15th July 1918.] 



Among the western species of stone-flies of the genus Taeniopteryx, 

 including T. pacifica. Banks, T. pallida, Banks, and T. nigripennis, 

 Banks, the first-named has proved to be of considerable economic 

 importance. The first adults appear during March, when the fruit 

 buds are beginning to swell, and as these begin to open, the flies eat large 

 holes in them, frequently destroying them entirely. In other cases, 



