708 



Maryland, are tabulated. Tliree-3'ear-old apple and peach trees badly 

 infested with this scale were used, and the application was made on 

 25th and 26th March 1914. Dry barium-sulphur was used at the rate 

 of 16 lb., 2i lb. and 32 lb. to 50 U.S. gals. On 30th May, 99| per 

 tent., 100 per cent, and ICO per cent, respectively of scales were dead, 

 and on 4th July no young scales were seen to be alive. The 

 percentage killed was also 99| when only 10 lb. had been used. The 

 lime-sulphur solution of 33° Be. was diluted at the rate of S-J- gals, to 

 50 gals., and on this plot 99^ per cent, of the scales were dead on 30th 

 May, while no young scales were alive on 4th July. On the unsprayed 

 control plot, only 50 per cent, of scales were dead on the former date 

 and very many young individuals were seen on 4th July. This. 

 similarity of result was again noticed in the control of other Coccids ; 

 they both controlled oyster shell scale [Lepidosajjhes uh)ii] and had no- 

 effect on peach Lecanium [Eulecanium iiersicae] or terrapin scale 

 \E. nigrofasciatum]. It is well known that lime-sulphur will not control 

 the latter. Another experiment showed that barium-sulphur has. 

 decided fungicidal properties and that it may prove to be even less 

 injurious to foliage than lime-sulphur solution. 



Arsenate of lime is another new insecticide worthy of consideration 

 as a possible substitute for arsenate of lead, as it appears to be equally 

 efficient, so far as one season's tests can determine [see this Review,. 

 Ser. A, iii, p. 447]. In a foliage test on peach trees 1| lb. of arsenate 

 of lime was diluted in 50 U.S. gals, water and almost defoliated the 

 trees, while arsenate of lead used on this same variety caused very 

 little injury. This test showed that arsenate of lime is more likely to 

 injure susceptible foliage than arsenate of lead. Apart from this, 

 it appears that for spraying apple and shade trees, arsenate of lime 

 may be used with the same degree of efficiency and safety as arsenate 

 of lead, and unless some unsuspected objection to this new insecticide 

 arises, it would seem a waste of money to continue the use of the more 

 expensive poison. 



Cory (E. N.). Insect pests of 1914. — Rept. Maryland State Hortic. Soc, 

 College Park, Md., xvii (1914), 1st March 1915, pp. 104-112. 

 1 plate- [Keceived 20th September 1915.] 



Cirphis {Leucania) unipuncta, Say, (army worm) destroyed grain 

 and forage crops in various parts of Maryland in 1914. Poison bran 

 mash was used against the injurious second brood. In several places 

 where it was not controlled, the third brood proved injurious about 

 10th October. Mayetiola {Cecidomyia) destructor, Say, (Hessian fly) 

 continued to be injurious. Cephus pygmaeus, L., (wheat-stem sawfiy) 

 and Meronvyza americana, Fitch, (wheat-stem maggot) are recorded 

 for the first time. Corn root worms {Cramhus sp.) and wire worms did 

 considerable injury to maize near Elkton. Sitotroga cerealella, Oliv., 

 (Angoumois grain moth) was unusually abundant in maize and wheat. 

 Epicauta cinerea, Fors. (grey blister beetle) caused considerable damage 

 to the lucerne crop of one grower. Tischeria malifoliella, Clem, (trumpet 

 leaf-miner of the apple) seemed to be on the increase. Eriosoma 

 (Schizoneura) lanigeruin, Haus., (woolly aphis) continued to be one 

 of the most injurious ap]>le pests. Pine tar creosote, either undiluted 

 or in emulsion made with caustic soda, should be sprayed about the 



