27 



Theobald strongly advises the addition of J Ib. of common 

 salt to each 10 gallons of the above wash. 



II. Nicotine and Soap Wash. 



Nicotine (95-99 per cent.) oz. 



Soap (soft) Ib. 



Water (soft) 10 gallons. 



If the water is hard, 1 Ib. of soap should be used. Dissolve 

 the soap in hot water, dilute to the required strength, add the 

 nicotine and stir well. If soft soap is unobtainable, hard 

 soap should be used instead. This is the best contact 

 insecticide. It will also kill Apple Sucker, Capsid Bugs and 

 young caterpillars. 



III. Pyridene and Soap Wash. 



Pyridene 4 oz. 



Soap (soft) I Ib. 



Water (soft) ' 10 gallons. 



Pyridene may be use.d as a substitute for nicotine to reduce 

 the cost of the wash. It is slightly less effective against 

 Capsids and is of little use against caterpillars. 



THE WOOLLY APHIS. 



(Schizoneura lanigera, Hausmann.) 



X. 



1. Winged female, magnified ; and line showing natural size. 2. Wing- 

 less viviparous female, magnified.* 3. Apple twig, covered by woolly 

 aphides. 



* Figure 2 is reproduced, with permission, from Mr. G-. B. Buckton':* 

 " British Aphides." 



