24 



INSECTS OF ECONOMIC IMPORTANCE 



Place lime in iron kettle and slake it with hot 

 water. Add sulphur and more water and boil for 

 one hour. Dilute to 50 gallons, strain, and use 

 while hot if possible. 



Concentrated commercial solutions ^^ — 

 Within the past few years commercial concentrated 

 lime-sulphur solutions have been introduced into 

 this state and have been used by many fruit grow- 

 ers in combating certain insect pests and fungous 

 diseases. In order to use one of these mixtures 

 intelligently and effectively it becomes necessary 

 to know its strength or, in other words, its degree 

 of concentration. This is best found by using an 

 instrument known as a Baume hydrometer. In 

 testing a lime-sulphur solution, simply pour some of 

 the clear reddish liquid into any deep receptacle, 

 deeper than the hydrometer is long, and when nearly 

 full, gently drop the instrument into the solution 

 and wait until it comes to rest. Then read on the 

 hydrometer the degree of concentration, which will 



51 Parrott & Schoene— N. Y. State Expt. Stat, Bull. 320. 



