340 



Pasturing sheep on the field for a few days in early spring has been 

 found beneficial, and on gravelly land where the dust mulch is an 

 impossibility, spraying the young crop with lead arsenate at the rate 

 of 5 lb. paste to 100 U.S. gals, water undoubtedly kills many of the 

 larvae. This method cannot however be recommended on account 

 of its cost and the possible danger of poisoning stock. 



Jones (C. R.). Grasshopper Control. — Colorado Agric. Expt. Sta., Fort 

 Collins, Bull. no. 233, June 1917, 27 pp., 8 figs. [Received 

 6th June 1918.] 



This bulletin gives an account of the life-history of the various 

 species of destructive grasshoppers found in Colorado and describes 

 the usual methods of control with particulars of the apparatus used. 



The more important species are Melanoplus atlantis, Riley, M. hivit- 

 tcUus, Say, M. differentialis, Thom., and M. femur-rubrum, De G. 

 Natural enemies include several parasitic and predaceous insects ; 

 a species of Sarcophaga has been bred abundantly from both nymphs 

 aaid adults. The large Carabid beetle, Calosoma obsoletum, Say, and 

 a robber fly, Promachus sp., have been observed on various occasions 

 feeding upon young grasshoppers. Solitary wasps, such as Priononyx 

 atratus, are also instrumental in destroying young hoppers. A list 

 is given of insectivorous birds that constantly feed upon grasshoppers 

 and other insects, while all domestic birds are known to aid materially 

 in checking them, but are only cf practical value on small areas. 



Pettit (R. H.), Report of the Entomologist. — 56tJi Ann. Rept. 

 (1st July 1916 to 30th June 1917) Michigan State Bd. Agric., 

 Lansing, 1917, pp. 321-322. [Received 5th July 1918.] 



During the period under review the pests that were more trouble- 

 some than usual included Aphids, particularly on fruits, onion maggot 

 [Hylemyia antigua], cabbage maggot [Phorbia brassicae] and bean 

 maggot [P. fusciceps]. The clover leaf beetle \Hyj)era punctata'] was 

 present in some districts early in the season and another weevil, 

 Sitones hispididus, became so numerous on lucerne that in some locali- 

 ties entire fields were destroyed. The fruit-tree leaf-roller \Cacoecia 

 argyrospila] continued to thrive in restricted areas and proved very 

 difficult to control. The tomato stalk-borer, Papaipema nebris 

 (nitela), ravaged potato fields, while a similar, if not the same borer 

 destroyed many young maize plants. Experiments in the control 

 of woolly aphis [Eriosoma lanigeriim] on young apple trees in nurseries 

 are being carried on. 



NoTEWARE (J. R.). Report of the South Haven Experiment Station, — 



56th Ann. Rept. {1st July 1916 to 30th June 1917) Michigan State 

 Bd. Agric, Lansing, 1917, pp. 673-678. 



Various "sprat's for scale-insects were used during the period, but 

 owing to lack of uniform conditions of application it was impossible 

 to determine the relative merits of the materials employed. For 

 Aphids on apples, " nicotine sulphate 40 percent., 1 oz. to 8| U.S. gals., 

 combined with lime-sulphur," was used, and also Scalecide, 1 gal. 



