152 



Insect Pests. 



This .ground treatment must lie earned out before April, and in 

 ilril uriit/icr. The etiect in wet soil is, I have found, as disappointing 

 as it is satisfactory in dry land. Mr. Pickering informs me tliis 

 cannot be so, as it should be nmst fatal in damp soil. However, 

 personal experience has proved the reverse two years in succession. 



It is very essential that all young stock be fumigated with hydro- 

 cyanic acid gas before planting. The stocks may be placed in a 

 greenhouse or tent rigged for the purpose, of known capacity, and then 

 fumigated. When dormant, as at the time of lifting, the bushes may 

 be fumigated at the folhjwing strength : — For every 100 cubic feet of 



';. l:!i:. — IN.IEOTISG lIlSlI.rHUiE IIP e.\l;B(ix liv MKAN^ 



I'HK \ i:i;>l(i|;h:i, IN.lKCTi ii;. 



space use 1 oz. of sodium cyanide or potassium cyanide, 1 oz. of sul- 

 phuric acid and 4 oz, of water. The trees should be kept in the 

 fumes for 4."i minutes. It will be found that the tips niav now and 

 then be scorched, especially in some varieties, as the Beauty of Batli 

 and Worcester Pearmain, but no actual damage is done. If nursery- 

 Uien will not guarantee the stock has been so treated, then it is well 

 wortli the grower's while to do so liiniself,* 



Pielicriiig icci.inuicnas iimuersion in petrol for five inimites ov in water at 

 IW V. for ten minutes, Tliis kills tlie apliis, but neither, as far as I ean s. 

 iitteets tlie o\a, so tluit tnmigation had liest be relied on. 



ee, 



