89 



The use of comparatively concentrated solutions of sodium sulpho- 

 carbonate and sodium ethyl-xanthate for treatment of balled earth 

 about the roots of coniferous plants is not recommended, as they cause 

 injury to the roots. 



Leach (B. R.). U.S. Bur. Ent. Experiments with Hot Water in 

 the Treatment of Balled Earth about the Roots of Plants for the 

 Control of Japanese Beetle Larvae. — Soil Science, Baltimore, Md.,x\\, 

 no. 1, July 1921, pp. 63-68, 1 fig. [Received 19th December 1921.] 



Further experiments were made in 1920 for the control of the larvae 

 of Popillia japonica, Newm. (green Japanese beetle) in soil about 

 the roots of coniferous and other plants with hot water (100°-130° F.). 

 The tests are described and prove that the roots of the plants cannot 

 stand exposure to heated water to the same extent as the larvae. 

 The larvae withstand an exposure of two hours in water heated to a 

 temperature of 105° F., but succumb in 45 mins. at 110° F., in 12 mins. 

 at 115° F., in 6-8 mins. at 120° F., in 3-4 mins. at 125° F. and in 1-2 

 mins. at 130° F. Soil-balls require immersion in water brought up 

 to a temperature of 110° F. and to remain immersed at that temper- 

 ature for 45 mins., and therefore this method of treatment is too slow 

 for actual practice. Plants vary in their resistance to immersion 

 in heated water, but even the most resistant are checked in their 

 subsequent growth. 



Urbahns (T. D.). The Strawberry Rootworm {Paria canella). — 

 Monthly Bull. Cal. Dept. Agric, Sacramento, x, no. 8, August 1921, 

 pp. 311-313, 3 figs. [Received 19th December 1921.] 



Typophorus [Paria) canellns, F. (strawberry root worm) is at present 

 distributed over about 300 acres in California. The various stages 

 and the character of injury are described [R.A.E., A, viii, 313]. In 

 California the adult beetles are sometimes active on warm winter 

 days, and they appear in large numbers in March. Eggs are laid in 

 the crowns of the strawberry plants and soil crevices from the end 

 of March until May. The larvae appear in June and work their way 

 to the finer roots of the plants. Pupation occurs in July, and the adults 

 emerge at the beginning of August. 



Spraying with lead arsenate (3 lb. powder to 100 U.S. gals, water) 

 or dusting with Paris green (1 lb. to 6 lb. flour) in the latter part of 

 August is advocated against this pest. If the beetles are present 

 in the spring, this treatment may be applied after the spring rains and 

 before abundant blooming occurs. \Vlien it is too late for arsenical 

 sprays, grasshopper poison bran mash may be useda 



Strong (L. A.). Quarantine Service. Reports for the Months of 

 May and June 1921. — Mthly. Bull. Cal. Dept. Agric, Sacramento, 

 X, no. 8, August 1921, pp. 331-335. [Received 19th December 

 1921.] 



The pests intercepted during May and June were : — From Washing- 

 ton, Plodia interpunctella on walnut sacks. From Florida, Lepido- 

 saphes beckii and Chrysomphalns aoniduni on oranges and grapefruit ; 

 and Aspidiotns cydoniae on coconuts. From Maryland, Lepidosaphes 

 (5441) G 



