344 



to maize in the ear by weevils and other Coleopterous pests of stored 

 grain. The results obtained confirm the conclusions already arrived 

 at on this subject and justify the recommendations previously given 

 [see this Beview, Ser. A, vii, p. 3]. 



Becker (G. G.)- Control of the Round-headed Apple-tree Borer.— 



Univ. Arkansas Agric. Expt. Sta., FayettevWe, Circ. no. 42, Julv 

 1918, 4 pp., 2 figs. [Received 10th June 1919.] 



The information contained in this circular concerning Saperda 

 Candida, F. (round-headed apple-tree borer) has previously been noticed 

 [see this Review, Ser. A, vi, p. 447]. 



UvAEov (B. p.). 063op-b BpeflMTenew cenbCKoxoaniiCTBeHHbix-b 

 pacieHiii TM(})nMccHoft m 3pMBaHCK0M ry6epHiM. [Review of 

 Agricultural Pests of the Tiflis and Erivan Governments for the Year 

 1916-1917.] «Tii(J)nMCCKoe SeMCKoe Biopo 6opb6bi Cb BpeAMTenflMM 

 ceilbCKaro X03flMCTBa.» [Tiflis Bureau for Control of Agrindtural 

 Pests], 58 pp., 1 plate, 1 map. [Received 9th June 1919.] 



" The list of the insect pests here given comprises : — 17 Arachnoidea, 

 10 Orthoptera, 84 Rhynchota, 61 Lepidoptera, 53 Coleoptera, 13 

 Diptera, and 16 Hymenoptera. 



The characteristics of the different localities are described, with the 

 pests occurring in them. Lists of the pests arranged according to 

 .their food-plants, as well as alphabetically under their scientific 

 names, are appended. 



The pests recorded include Rhynchota : — Stephanitis pyri, F., 

 which is widely distributed and causes most damage in dry districts, 

 being especially numerous in April. Eriosoma {Schizoneura) lanigerum, 

 Hausm. (woolly aphis) is one of the most serious pest in the Caucasus ; 

 the damage caused varies in different districts, damp localities suffering 

 most. Pterochloroide^s persicae, Cholodk., is found everywhere on 

 peaches, ultimately causing the death of the trees in about 10 to 15 

 years ; the chief damage is done in hot and dry districts. Almonds 

 and Primus divaricata are also attacked. Myzodes tabaci, Mordv., 

 is a very serious tobacco pest, and much reduces the value of the crop. 

 Brachycolus noxius, Mordv., Maerosiphum granarium, and Aphis 

 maidis are the chief Aphid pests of cereals. Aspidiotus ostreaeiformis. 

 Curt., infesting pear and apple trees, is one of the most important 

 Coccids. 



Lepidopterous pests include : — Orgyia antiqua, Hb., which infests 

 apples and has two generations a year, hibernation occurring in 

 the egg-stage of the second generation. Nygmia phaeorrhoea 

 occurs chiefly on Mespilus oxyacantha, more rarely on apples, pears 

 and plums. Pyrausta mibilalis, Hb., causes great damage to maize 

 and has two generations in the Caucasus. Cydia {Carpocapsa) pomonella, 

 L., is chiefly found in the higher districts attacking apples, plums, 

 pears, apricots, quinces, pomegranates, peaches and cherries, but does 

 not appear in great numbers probably owing to the activity of para- 

 sites and fungus diseases. Hyponomeuta ynalinellus, Z., and H. varia- 

 bilis, Z., which may become very serious pests, are unequally 

 distributed in the different districts, depending on climatic conditions. 



