856 EXPERIMENT STATION RECORD, 



eni sloi)e of the Stato it is expected that it will, in a few years, become dis- 

 triiuited throiijrliout nearly all the important peach sections. 



Three imiutrtaiit plum lice considered are the mealy plum louse ( Ilynloptcrus 

 ariin(Ii)tis) which is sometimes sufficiently numei'ous to completely cover the 

 under surface of the leaves, the rusty l)rown plum louse (Apliis srtnriw) which 

 is found particularly uiion red or American plums, and the ho]) iilaut louse 

 (Phorodon humtdl) which inhabits the i)lum as a winter host plant. 



The black cherry louse (Myzus cerasi) is said to be generally distributed 

 through the orchards of the eastern sh)pe of the Rocliy Mountains in Colorado. 



Directions for the preparation of the insecticides recommended in the bulletin 

 are appended. 



Orchard plant lice and their remedies, ('. P. Uillettk and E. P. Taylor 

 {Colorado St(t. Bui. I.l'/. pp. .i-Ki). — An abbreviated edition of the above. 



Control of leaf blister mite in apple orchards, 1'. J. Parrott {New York 

 titate Sta. Bui. 306, pp. ^17-^38). — This is a continuation of worli previously 

 noted (E. S. K., 18, p. J)55), 



The general spotting of apple foliage by this pest is said to have been an 

 annual occurrence for several years, the pest having now become quite common 

 throughout the apple-growing sections of western New York. It is also known 

 to occur in Massachusetts. Pennsylvania, Illinois, and the province of Ontario. 



It is concluded tliat the experiments reported show very conclusively that the 

 blister mite is not a difficult pest to combat and that it can be efficiently con- 

 trolled by sulphur sprays, miscible oils, and homemade oil emulsions. Orchards 

 regularly sprayed with such mixtures are not subject to injury by the mite. 



" Comparative tests of the boiled lime-sulphur wash, the homemade concen- 

 trated lime-sulphur wa^h, and two commercial preparations gave equally satis- 

 factoi'y results. One application of either of these sprays has practically pre- 

 vented spotting of foliage by the mite. 



" With the increased availability of the sulphur sprays these are now prac- 

 ticable remedies for the treatment of apple orchards for the blister mite. In 

 employing these remedies for this purpose, a plan of spraying well adapted for 

 the treatment of apple trees is an application of a sulphur wash as the buds 

 are swelling and before the leaves appear, followed by the usual second and 

 third applications of the Bordeaux mixture in their proper season." 



Sulphur sprays for blister m.ite, F. H. Hall {New York State 8ta. Bui. 306, 

 popular cd., pp. 3-1). — This is a popular edition of the above bulletin. 



A note on the fumig'ation of citrus trees with hydrocyanic-acid g'as, F. 

 Thomsen (Transvaal Agr. Jour., 7 {1908), No. 25, p. 74, pl. 1). — ^A description 

 with illustrations of frame tents used in fumigating citrus trees. A table is 

 given showing the quantities of materials to be used in the various sizes of 

 of tents. 



The castor semi-looper (Ophiusa melicerte), H. M. Lefroy {Mem. Dept. Agr. 

 India, Ent. Ser., 2 {190S), No. J,, pp. 59-77, pis. 2. fig. 1). — A general account 

 of the life history and habits of this insect, which is the source of considerable 

 injury to the castor bean {RiciHiis communis). In addition to several other 

 plants, tea is occasionally attacked. A hymenopteron and a tachinid fly arc- 

 reported as important enemies. Cultural methods, hand picking, and the 

 application of arsenicals are described as remedial measures. 



Pemphigus tessellata: Alternate host, migrants, and true sexes, Edith M. 

 Patch {Ent. Neivs, 19 {1908), No. 10, pp. ^S-^-^SS, pl. i).— From observations 

 recorded by the author it appears that the maple is an alternate host plant of 

 the alder blight {Pemphigus' tessellata) and that the maple forms described by 

 Rilej' as P. acerifolii are P. tessellata migrants. 



