610 



A. pomi (green apple aphis), the latter reappearing in midsummer 

 on new growth, curling the foliage and staining the fruit. Peas were 

 considerably damaged by Acyrthosiphon {Macrosiphum) pisi (pea 

 aphis) and M. solanifolii (pink and green aphis) . Eriosoma {Schizoneura) 

 lanigenim caused little damage, though present in unusual numbers. 

 Myzus cerasi caused the usual amount of damage. Pears were much 

 damaged by Psylla pyricola (pear psylla). Cydia {Laspeyresia) molesta 

 showed a marked increase in numbers and seriously attacked fruit 

 early in the season. 



Macrodactyhis sitbspinosus (rose bug) was unusually abundant, 

 but the self -boiled lime-sulphur treatment again proved effective. 

 Epitrix atcunieris (potato flea-beetle) occurred early in the season 

 in large numbers, and in some parts potatoes were seriously damaged. 

 Coating with Bordeaux eliminated some injury. 



Conotrachelus nenuphar (plum curculio) did much damage to apple, 

 peach and plum that had been unprotected. Some control was obtained 

 during the period of attack b^^ a complete coating of common spray 

 mixtures. Owing to the increased spread of Popillia japonica (green 

 Japanese beetle), efforts to exterminate it were abandoned, and attention 

 was devoted to delaying its spread by quarantine and artificial control 

 measures and the introduction and establishment of natural enemies. 



Experiments are described on the effect of atmospheric moisture 

 on the metabolism of Brtichis oUectus (bean weevil) [R.A.E., A, 

 X, 43]. The effects on seeds of various methods of subjecting them to 

 low atmospheric moisture for protecting them against seed-infesting 

 insects are given. 



Investigations have proved that dusting is almost as effective as 

 liquid sprays in controlling the common insects on peach, but on 

 apple, Cydia pomonella and Conotrachelus nenuphar cause twice as 

 much injury to dusted fruit as compared with sprayed fruit. Dusting 

 materials should be fundamentally investigated to make them adhere 

 and to render them as effective against sucking as against chewing 

 insects. It has been proved in New Jersey that nicotine-impregnated 

 dusts destroy a higher percentage of the oat aphis [Siphonaphis padi] 

 and apple leaf-hopper [Empoasca mail]. 



Brood studies and methods of control of Cydia pomonella have 

 been continued. So far the existence of only two broods is indicated. 

 Spraying controls the larvae entering the blossom end, but does not 

 always control those entering the sides. The idea that thorough 

 control of larvae entering the blossom end will result in a satisfactory 

 control of the second brood has been disproved in parts of the State 

 badly infested by both broods, and in these the second brood has 

 caused double the damage. Experiments are being made to determine 

 the value of changes in spray schedules designed to effect side control 

 of both broods. 



Peterson (A.). Experiments with Various Substances for the Control 

 of the Peach-tree Borer, Sanninoidea exitiosa, Say. — Kept. New 

 Jersey Agric. Expt. Sta., 1920-21, New Brunswick, 1922, pp. 

 378-388, 1 table. 



Experiments with various svibstances for the control of Aegeria 

 (Sanninoidea) exitiosa, Say (peach-tree borer) were made during 1920-21 

 and included asphalt compounds, hydrated lime, mercuric chloride, 

 sodium sulpho-carbonate, sodium cyanide, orthodichlorobenzene and 

 paradichlorobenzene. No product used prevented the entrance of 



