407 



RoHWER (S. A.). Descriptions of four new parasitic HymenDptera. — 



Canadian Entomologist, Lnndod. Ont., li, no. 6-7, June-Julv 1919, 

 pp. 160-162. 



The new species of Hymenopterous parasites here described are : 

 Tetrastichus rugglesi bred from Agrilus arcuatus in Minnesota, and 

 Trigonura hicoriae, Ecphylus hicoriae and Heterosjnlus hlackmanni, 

 all bred from Hicoria glabra in New York. 



Treherne (R, C). Wireworm Control, with special Reference to a 

 Method practised by Japanese Growers. — Agric. Gaz. Canada, 

 Ottawa, vi, no. 6, June 1919, pp. 528-530. 



The usual remedial measures against wireworms practised in Europe 

 and America are reviewed, including seed treatments, soil fumigation, 

 soil treatments, soil handling, trapping and baiting. As the onion- 

 growing industry in British Colmnbia is largely in the hands of the 

 Japanese, it was a matter of interest to observe the methods employed 

 by them. These comprised the use of baits made of rice shorts- or 

 rice bran roasted dry in pans or on sheets of tin over a fire. These 

 have a strong odour which is said to be attractive to wireworms. 

 The roasted substance is moistened with a little water and moulded 

 by hand into small compact balls, which are then placed in the ground 

 in holes about ten feet apart between the rows of onions. In about 

 a week or ten days the baits are taken up, broken open, and the 

 wireworms removed by hand and destroyed. The baits can then 

 be re-moulded and re-set. An experiment was tried with these baits 

 on 4 acres of ground on 25th April, the cost being nearly £3. A 

 table shows the records of captures examined on 2nd May, when the 

 onion plants were about 1 in. above the ground. Those on land 

 previously baited yielded an average of from 1*9 to 3' 9 wireworms 

 per bait, while on land not previously baited the average was from 

 20"2 to 22"6 per bait. From the remainder of the plantation 5,755 

 baits captured 24,869 wireworms ; this is not a very high average, 

 but in view of the large acreage and the variability of infestation the 

 results were considered to show that this method has a distinct value 

 in wireworm control. A single bait, used twice on a heavily infested 

 spot, yielded 90 \\dre worms, so that the statement of Japanese growers, 

 that over 100 individuals may be taken in a single bait, seems quite 

 possible. 



HoLLowAY (T. E.) & LoFTiN (U. C). The Sugar-Cane Moth Borer. — 

 U.S. Dept. Agric, Washington, D.C., Bull. no. 746, 18th April 

 1919, 74 pp., 9 plates, 12 figs. [Received 26th July 1919.] 



This bulletin deals at length with Diatraea saccharalis cramhidoides, 

 Grote (sugar-cane moth borer), and its economic importance as a 

 pest of sugar-cane. The history and distribution of the various 

 species of Diatraea and their native food-plants are given. The various 

 stages of D. saccharalis cramhidoides are described and its life-history 

 and seasonal occurrence discussed. 



