CONTEOL OF WHITE GRUBS. 



11 



Experiment XIII.— Repellent and Killing Effect of Various Manurial Agents 



on May Beetles. 



From the data given in the two preceding tables tlie followintr 

 facts are suggested: 



Ammonium sulphate does not act as a repellent l)Ut shows good 

 killing powers. 



Chloride of potash acts as a good repellent. 



Potassium sulphate and acid phosphate do not repel but liavr' 

 some killing action. 



Cyanamid and lime are good repellents, whereas blood and bone 

 meal are very attractive to the beetles. 



Whether or not these qualities hold up under held conditions 

 may be seen in the data given under Experiment XV. 



The following experiment was conducted in the same manner as 

 Experiment XII, with the exception that different chemicals werc^ 

 applied to the soil in the pots. 



Experiment XIV. — Repellent Effect of Various Chemicals to May Beetles. 



