62 EXPERIMENT STATION RECORD. 



little difference is observed in the extent to which different varieties of grapes 

 are attacked. The grape curcnlio is preyed npon by a number of insect ene- 

 mies. Among the various methods which may be adopted in controlling this 

 pest, spraying is of chief importance. It appears to be possible by means of 

 arsenical sprays to control the pest quite completely. For this purpose 4 oz. 

 of Paris green and 4 lbs. of lime in ')() gal. of water are quite satisfactory. 

 Grapes may also be protected by surrounding each cluster with a paper bag. 

 If this method of combating the pest is adopted it may be estimated that pins 

 will cost l.j cts. a thousand, bags 85 cts. per thousand, and the work about $1 

 per thousand bunches. This method not only has the advantage of protecting 

 grape clusters against the curculio, but also prevents rot, and the grapes have a 

 fine appearance. It is recounnended for home vineyards and commercial grow- 

 ers who cater to a fancy trade. The insects may also be controlled to some ex- 

 tent by jarring and by collecting infected grapes. A brief bibliography relating 

 to this insect is appended to the bulletin. 



Arsenical treatment of grape flea beetles, L. Trabut (Bui. Affr. Algerie ct 

 Til II is ic. 12 (V.KKi). Ao. 6'. PI). 112-11.'/). — Some difficulty has been experienced 

 in the use of ui-dinary arsenicals for destroying this pest since the grape foliage 

 i.5 injured by applications strong enough to destroy the Insects. Within recent 

 years, however, better results have been obtained from the use of lead arsenate 

 s;ince this material is almost eqiu^lly poisonous to the insects and not soluble 

 and therefore not injurious to the grape foliage. 



The Bombay locust (Acridiuni succinctum), 11. Maxwell- Lefroy (Mem. 

 Dept. Ai/r. India. Ent. 8er., 1 {1006). Xo. 1. pp. 112. pis. IS).— The present 

 account contains a report of investigations on Acridiuni siicciiictiim in India 

 during the years 1903-4. In various parts of the Bombay Presidency this locust 

 prevails in large numbers where it feeds on grasses, sorghum, and various other 

 crops. In some cases the migratory locust {A. peregrin um) appeared after the 

 other species had left. The winged locust appears during October, undertakes 

 niigration during November, remains largely in forests from December vuitil 

 March 20, shows other migratory movements from March 20 to May 20, after 

 which they become scattered. The life history of the insect is discussed in 

 detail. In combating this species, various remedies have been tried, including 

 the use of arsenical poisons. Experiments were carried on by G. K. Walker in 

 which the effect of eatiqg forage plants treated with arsenicals was tested on 

 cattle. In some instances unfavorable results were obtained, since arsenic taken 

 repeatedly in small doses exercises a cumulative poisonous effect. The general 

 programme of eradication of locusts as recommended by the author includes a 

 'f:tudy of the movements of-the swarms during the first migrating period, driving 

 the locusts out of crops and destroying them, jtarticularly at night and at the 

 lime when the young hoppers first appear. 



A hopperdozer, P. K. Blinn {Colorado Sta. Bill. 112, pp. 8, figs 5). — During 

 recent yeai's alfalfa has been greatly injured by grasshoppers in various parts of 

 Colorado, and for the last few years these pests have apparently been increasing 

 in numbers. Last year the injury from grasshoppers was unusually severe. 

 Various methods were adopted, sucb as driving and the use of poisonous baits, 

 but without much success. Experiments were carried out by the author in a 

 number of localities during which a hopperdozer costing about $4..50 for con- 

 struction was tested to determine its value when hauled over the field behind 

 the mowing machine. It was found that 1 horse could be attached to the side 

 in such a manner as not to frighten the grasshoi)pers away from the bo{)per- 

 dozer. The hoi)perdozer was mounted on wheels in order not to catch in the hay. 

 The use of this machine on a G-acre field of alfalfa resulted in catching between 



