752 EXPERIMENT STATION RECORD. 



" The grape-blossom midge is foimd in Chautauqua County, especially on 

 early varieties of grapes. The adult midges emerge from the soil during the 

 latter part of May and the first week in June. They mate soon after emergence 

 and egg-laying begins. The females deposit the eggs in the blossom buds and 

 soon perish. The eggs hatch in a few days and the larvae feed on the pistil of 

 the blossom bud. The work of the larvae prevents the development of the buds 

 and thus such injured buds do not produce any fruit. The feeding of the larvsB 

 causes the buds to have an enlarged appearance and to become red in color. 

 The larvae feed about 2 weeks and then pass from the buds to the soil where 

 they remain until the following spring. These larvae form hibernating cocoons. 

 Pup£e were found the first part of May. The pupal stage is at least 3 weeks in 

 length. The use of a nicotin preparation as a spray was found to diminish the 

 number of eggs laid. , , , 



" Experiments were made with various insecticides to kill the rose-chafer 

 and a mixture consisting of 10 lbs. of arsenate of lead, 25 lbs. of glucose, and 

 100 gal, of water was found to be very effective in killing the insects. The net 

 gain per acre over the unsprayed grapes was $G1.S4. Experiments proved that 

 the numbers of the rose-chafer could be materially reduced by cultivating the 

 soil when the insects are in the pupal stage. 



The grape root-worm is the most serious insect pest of grapes in Chautauqua 

 County. . . . The most efficient method of controlling this insect is to spray 

 the vines with an arsenical poison, preferably arsenate of lead, when the beetles 

 are feeding. This is usually combined with Bordeaux mixture. Experiments 

 during 1910 appear to show that the use of a gallon of molasses, 6 lbs. of 

 arsenate of lead, and 100 gal. of water is a very effective treatment. 



" The experiments with the grape leaf-hopper have shown that the nymphs 

 are very easily killed by the use of a nicotin preparation, guaranteed to con- 

 tain 2.7 per cent nicotin, and diluted with 65 to 100 parts of water. Lime- 

 sulphur solution as dilute as 1 gal. to 100 gal. of water proved very effective 

 against the leaf-hopper nymphs but it generally caused much injury to grape 

 foliage and the fruit." 



Commercial lime-sulphur solution, when used as a repellent for the grape 

 blossom midge in dilutions ranging from 1-40 to 1-60, severely injured the 

 foliage. 



[Olive insects] (BuJ. Dir. Agr. Com. et Colon. [Tunis^, Ik {1910), No. 56, 

 pp. 296-3Ji5, figs. 7 ) . — Several papers relating to insect enemies of the olive and 

 their control are here presented, as follows: Combating the Principal Olive 

 Pests, by Chapelle (pp. 296-312) ; Treatment for Lccanium olew and a Fungus 

 Disease due to Cycloconiwnv oleaginum, by E. Zacharewicz (pp. 315-318) ; 

 Insects and Diseases of the Olive, by N. Minangoin (pp. 319-336) ; and Le- 

 canium olece, by Morizot (pp. 340-345), 



Castilla rubber pests in Mexico, D. L. Crawford (Amer. Rev. Trop. Agr., 

 1 {1910), No. 8-9. pp. 2'il-2.'i7). — A brief account of observations of the insect 

 pests of CasiiUa cUistica in Mexico. 



Insects destructive to Canadian forests, C. G. Hewitt {Com. Conserv. 

 Canada Rpt., 1 {1910), pp. 142-151). — An address in which the more im- 

 portant insect pests of Canadian forests are briefly discussed. 



The animal enemies of Pinus cembra, C. Keller {Mitt. Schweiz. Central- 

 anst. Forstl. Versuchsu\, 10 {1910), No. U pp. 3-50, figs. 15; ahs. in Zrntbl. 

 Allg. u. Expt. Biol., 1 {1910), No. 15-16, pp. 552, 553).— A report of studies of 

 the insect and other animal enemies of cembran pine in the forests of the 

 Swiss Alps. 



Insects destructive to books, W. R. Reinick {8ci. Amer. Sup., 10 {1910), 

 No. 1825 pp. A08-410, figs. 8; Amer, Jour. Pharm., 82 {1910), No. 12, pp. 



