511 



Weldox (G. p.). Spraying Deciduous Fruit Trees.— Mthly. Bull. 

 Cal. State Dept. Agric, Sacramento, xi, no. 7, July 1922, pp. 24-30. 



The spra3dng of almond trees should be more general in California 

 in order to deal with the red spider [Tetranychits telarhis], which 

 is a very common pest. Apricots need to be spra\ed principally for 

 the brown apricot scale [Eiilecanium corni] and black apricot scale 

 [Saissetia oleae]. The trees should be sprayed with miscible oil in 

 No^•ember or December at the latest, but nol before migration to the 

 twigs has taken place when the foliage drops. Apple trees require 

 annual spra\ang for codling moth [Cydia pomonella] ; peach trees are 

 best treated wdth Bordeaux mixture in the autumn, followed by hme- 

 sulphur applications in early spring just as the buds are opening. 

 Peaches suffer considerably from attacks of Anarsia lineatella (t\\ig 

 borer), which would also be controlled to a large extent by this 

 spra3-ing. 



DE OxG (E. R.). Summary o£ Measures for Control of Red Spiders on 

 Deciduous Trees. — Mthlv. Bull. Cal. State Dept. Agric, Sacra- 

 mento, xi, no. 7, July 1922, pp. 30-36. 



The mites dealt with are Tetranychus telariiis, L., which is generally 

 acti^•e through summer and autumn ; Bryohia praetiosa, Koch, 

 primarih' a pest of almond and prune, and active during spring and 

 early summer ; and Paratetranychus pilosiis, Garm. (citiTis red spider), 

 found on Citrus and deciduous trees throughout spring and siunmer. 

 Brief notes are given on the life-history and habits of these mites 

 [R.A.E., A, ix, 512]. Remedial measures are discussed and are 

 similar to those recommended previously [loc. cit.], except that i lb. 

 calcium caseinate is substituted for the glue water in the first formula 

 and for the flour paste in the second. The cost of sprajing and dusting 

 is compared, and although the latter is less expensive for a single 

 application per acre, it is generally found that two or three applications 

 are required, and even then thej^ ma\- be less effective than one thorough 

 sprajing. 



BoRDEx (A. D.). U.S. Bur. Ent. Control of the Citrus Red Spider. — 



Mthly. Bull. Cal. State Dept. Agric, Sacravunto, xi, no. 7, July 

 1922, pp. 36-39. 



The citrus red spider [Paratetranychus pilosus] is one of the most 

 important pests in the citrus orchards of Southern Cahfomia. The 

 adults live about 30 days, each female depositing about 30 eggs, but 

 temperature has a great influence on longevity. The heaviest infesta- 

 tions are generallj- during ]\Iay and June, and as the natural enemies 

 do not appear in numbers before late July total defoHation may occur, 

 causing severe damage to the fruit. During August and September 

 infestation is generally held in check b}' natural enemies, which include 

 the Coccinellid, Stethorus picipes ; the Coniopterjgid fly, Conventzia. 

 hageni ; the Staph3iinid beetle, Oligota oviformis ; a large undetermined 

 purple thrips ; the green lacewing, Chryscpa californica ; and the brown 

 lacewing, Henierobius pacificus [cf. R.A.E., A, i, 143]. As spraving 

 with 3 and 5 per cent, liquid lime-sulphur had not given good results 

 against this mite, an emulsion was tried composed of a low-grade 

 distillate oil with powdered soap and a small quantity of cresolis 

 compositus. The soap powder was found to cause pitting of the fruity 

 and was therefore replaced b}- a vegetable oil hquid soap with a 



