FUMIGATING. 47 



ing do not enter the house till the following morning, and 

 if done in the morning wait till the afternoon before doing 

 so. Remember, the fumes or vapour of nicotine are 

 poisonous, and must not be inhaled. 



In the case of aphide^^ one fumigation usually kills 

 them. Thrips sometimes require to be fumigated on two 

 successive days, and Red Spider and Mealy Bug on three 

 successive days. On the morning after each fumigation 

 thoroughly syringe the plants to remove remains of dead 

 insects. 



Errors to Avoid. — Never fumigate ferns; their foli- 

 age is too tender to withstand the fumes, and will turn 

 brown and shrivel if fumigated. 



Fumigation, too, discolours the flowers of many plants, 

 and causes them to shed their petals quickly; so avoid 

 fumigating flowering plants in blossom unless badly 

 infested. 



Grape-vines, again, should not be fumigated when the 

 crop is ripening; nor, indeed, should ripening fruit of any 

 kind be fumigated, as there would be a risk of a poisonous 

 deposit taking place on the skins. 



Never exceed the quantity of materials advised for a 

 specific number of cubic feet. It is far safer to err on the 

 side of using a less amount and fumigating on two occa- 

 sions than to exceed the amount in one operation. 



Fu migrating: Outdoor Crops.— It is possible to 

 fumigate fruit trees and bushes in the open air by envelop- 

 ing the tree in a close-textured sheet and using tobacco 

 sheets or rolls, or one of the other compounds, at the base. 

 The cubical contents of the area of the tree or bush should 

 be ascertained, so as to use approximately the right quan- 

 tity of nicotine. We have successfully fumigated wall 

 trees, roses, larger fruit trees, and currant bushes in the 

 manner just described. 



