34 



abundant by the 14th. Tlic infestation was serious enough to warrant 

 the apphcation of Bordeaux mixture and lead arsenate. The beetles 

 were also found in large numbers during June on man^• of the eommon 

 weeds. 



GuYTON (T. L.). The Chrysanthemum Gall Midge, Diarthronomyia 

 hvpogaea, F. Loew. —Ohio Ai^n'c. Exp/. S/u., Woosler, Bull. 341, 

 May 1920, pp. 103-114, 7 figs. [Received 16th November 1920.] 



Diarthronomyia hvpogaea [R.A.E., A, v, 14] was first reported on 

 chrysanthemums in ()hio in 1918. In greenhouses the length of its 

 life-cycle is from 40 to 50 days. Experiments indicated that it can be 

 successfull}' controlled at the time of the emergence of the adult by 

 spraying with a solution made of 1 part nicotine-sulphate solution 

 containing 40 per cent, nicotine to 500 parts of water, with 1 oz. of 

 fish-oil soap added to each gallon of the solution. This must be 

 repeated every four or five days as long as any living forms of the 

 midge remain in the galls. An attempt must be made to cover every 

 gall on the plant on both sides of the leaves. 



To prevent the introduction of infestation into a greenhouse, new 

 stock should be carefully inspected, and if possible, kept in a separate 

 room for some time, where developing galls should be carefully watched 

 for. Where the infestation is confined to a few plants, the safest 

 treatment is to burn them as soon as discovered. 



CooLEY (R. A.). Department of Entomology. — 26th Ann. Kept. 

 (1918-19) Montana Agric. Expt. Sta., Bozeman, Februarv 1920, 

 pp. 27-29. [Received ^1 6th November 1920.] 



Grasshoppers are the most persistently destructive of the farm 

 insect pests in Montana. They are present in injurious numbers 

 every year, and at times become so numerous that green vegetation 

 over entire districts is liable to destruction. 



Attempts have been made to find a cheaper form of the usual poison 

 bran mash, which is recognised as affording the most successful 

 remedial measure. It was found that finely powdered crude white 

 arsenic is as efficient as Paris green, which costs at least five times as 

 much. One ounce of amyl acetate replaces eight oranges or lemons, 

 and with the grasshopper tested during the experiments, is far 

 more effective. It is also much easier to transport and prepare. There 

 are also strong indications that molasses may be omitted from the 

 formula without lessening its efficiency. 



Next to grasshoppers, cutworms are tlie worst pest in Montana. 

 Porosagrotis orthogonia [K.A.E., A, ix, 21] has appeared, and threatens 

 to be more destructive than any species yet encountered. It caused 

 at least £200,000 damage in the year. 



In potato spraying experiments it was found that both zinc arsenite 

 and calcium arsenate arc quite as efficient as Paris green, and are one- 

 third cheaper. Limited experiments with crude white arsenic as a dust 

 secured promising results. 



Treherne (R. C.) cS: Ruhmax (M. H.). The Onion Maggot.— Pror. 

 Entom. Soc. Brit. Columbia, Victoria, B.C., luon. Srr. no. 11, 

 April 1920, pp. 91-94. 



