Its -forKNAJ. ()1- J lU', Dlill' AIMMKM ()i- At.KK li/I I KK.- -AtM . . , \\)22. 



IN»\\ i;i; l)isji,N(i I'A^rir.Mi.N 1 . 



Ill the diisliu}^' leasts a I KLsenhurj;' u larg-e-typc L'o-lior>so-})uwer 

 (luster Avas used (see Fig's. 1 and 2). The limo-sulphur, lead-ar.sonate 

 ])()\vder, and deliydiated copper-sulph.'tlo used were of more than 

 'JOU luesli to the iiieh fineiie.ss, and free tioin niil. Tlie dusted trees 

 consisted of plots of three roAvs in jicjll imd in lit'Jj, iind <(f (wo rows 

 in 1922, and were handed for Iraj>pinj4' hir\a<', to avoid as much 

 infestation as jiossihle in adjoining' spray plots, each of which con- 

 sisted of at least three rows. Jlie trees selected for records occupied 

 the middle of each ])lot. 



Ki.si I, IS (»!•' J"jX1>i;im.\ii;.n IS. 



Tahle i shows that, at lUsenhurg', ])()Mcr dusting' was markedly 

 inferior to power spraying' in the control of codling-moth for three 

 successive years. Table II demoustratevS that dusting was considerably 

 less efficient than sjnaying- in the control of fiisicladium on Louise 

 Bonne pears during" two seasons, and it Failerl to control codling"- 

 moth in this variety. 



Tdhlr I. — J'oircr Di/sh/n/ versus Ltqiinl •'^pidj/i/ifj, Codliuji-innth 



Control. 



* The comparatively high percentage of codling fur the season of 1919-20 was evidently 

 due to a very small crop of pears in the orchard as a whole, following a large one. and to 

 the failure of dusting and other questionable arsenicals tested. " 



