THRIPS. 



197 



application, as any of those used to destroy the Thrips 

 Mould hurt the corn. The chief means of prevention 

 seems to lie in clearing stubble, or in deep ploughing 

 to get rid of Thrips which may be wintering at the 

 roots of the removed crop, or in destroying wild 

 grasses on which the eggs may be laid round the 

 fields. 



Fig. 152. — No. 1 Eclair, or Knapsack Pu:iip. 



The Knapsack Sprayer, figured above, is a very 

 convenient form, and is noted here as being service- 

 able for distribution of washes and sprays for de- 

 struction of Aphides, Scale insects, &c. ; as well as 

 for the distribution of Paris-green, mentioned at 

 p. 140. The Sprayer is procurable from Messrs. 

 €. Clark & Co., Windsor Chambers, Great Saint 

 Helens, London, E.G. 



