456 EXPEKIMENT STATION RECORD. [Vol.43 



natural control. Control work with arsenlcals indicates that lead arsenate 

 acts largely as a repellent rather than an an insecticide. Experiments reported 

 in which lead arsenate, zinc arsenite, and Paris green were used led to the 

 recommendation that arsenite of zinc be applied at the rate of 1 lb. to 40 gal. 

 of water, or li lbs. to 50 gal. of water, or lead arsenate 1 or 2 lbs. to 50 gaL 

 of water. 



A list is given of 23 references to literature. A brief account of the bean 

 ladybird in Colorado in 1019, by A. E. Mallory (pp. 21-24), follows. 



Smaller pear borer (Laspeyresia molosta Busck) , Nishi-Hime-Shinki'i 

 (Abs. in Rev. Appl. Ent. 8 (1920), Ser. A, No. 1, pp. 23, 2^).— This pest, known 

 in the United States as the oriental peach moth, is one of the most dastructive 

 insects in Japan, occurring in nearly all of the Provinces of the Empire. Whero 

 it is most numerous in that country, from 80 to 90 per cent of the pear crop 

 may be destroyed by it. There are 4 or 5 generations per year, the time of 

 appearance varying with the climate of the locality. 



On hybrids of Batocera albofasciata and B. gigas, K. W. Dammerman 

 (Tijdschr. Ent., 62 (1919), No. S-Jf, pp. 151-160). — Breeding experiments by the 

 author show that deviating forms ai'e actually hybrids of B. albofasciata and 

 B. gigas. It appears that so long as these species are free to select, the hybrids 

 will only occasionally occur. 



Root-bark channeller of citrus (Decilaxis citriperda Try on) , H. Tryon 

 (Queensland Agr. Jour., 13 (1920), No. 2, pp. 111-82, figs. U). — Injury to the 

 orange by a cryptorhynchid beetle here described as new was first observed 

 in Queensland in 1908, but not until 1917 was its noteworthy hai'rafulness 

 brought to attention. In the latter year certain trees at Montville exhibited a 

 lack of vigor suggestive of die-back but without the shedding of foliage. Ex- 

 amination of their root system showed that those roots at or near the surface 

 were apparently dead or nearly so, having been attacked by borers. Soon after- 

 wards the occurrence of this pest was observed at Mapleton. 



Technical descriptions are given of this beetle and an account of its habits, 

 injury caused, and the present status of control work. The eggs are deposited 

 in small depressions or holes gnawed in the bark, one egg in each. Upon 

 hatching out, the larva at once commences to mine, but apparently in no fixed 

 direction. Pupation t^kes place in wide channels within the root bark tissue. 

 There are thought to be at least two broods, adults emerging in the spring 

 (September) and again in December-January. 



Thus far experiments have not resulted in the discovery of any remedial 

 measures that can be relied upon for successful results. 



The powder-post beetle and its parasite, W. W. Froggatt (Agr. Gaz. N. S. 

 Wales, 31 (1920), No. 4, pp. 273-276, figs. 2).— This is a brief account of Lyctiis 

 brunneus, which was found in 1919 to be attacked by an undetermined braconid 

 parasite. 



Further experiments with poisoned bait on maize lands, R. W. Jack 

 (Rhodesia Agr. Jour., 17 (1920), No. 2, pp. 130-136).— This is a brief report of 

 tests made with snout beetles (Tanymecus) and the surface beetles (Gono- 

 cephalum). 



Poison boll weevils, F. C. Ward (Ga. Col. Agr. Bui. 196 (1920), pp. 12, figs. 

 2). — This presents the results of several demonstrations in poisoning the boll 

 weevil made in Georgia during the summer of 1919. Details are given of the 

 work carried on on six farms, four of which showed profits, respectively, of 

 $1.31, $4.53, $18.87, and $23.31, and two showed losses of $3.17 and $6.05 per 

 acre. The data presented have been summarized by the author as follows : 



" The use of calcium arsenate for controlling the boll weevil is profitable if 

 It Is used under proper conditions. It will be more profitable when used on 



