THE WEED PROBLEM: INSECTS, ETC. 8l 



ence of the white grub may be suspected. 

 These grubs live in the ground three years be- 

 fore emerging into the perfect insects. They 

 may be brought under control by ploughing in 

 fall and allowing chickens to forage on the lawn, 

 as they are particularly fond of these fat grubs. 

 On lawns which cannot be ploughed up, spray- 

 ings with kerosene emulsion has been found 

 a good remedy. The use of a very heavy roller 

 has often been satisfactory in crushing the 

 grubs in light soils. 



EARTH WORMS AND THEIR CASTS 



Earth worms are an indication of an im- 

 properly drained top soil, or of a soil that is 

 cold or heavy. They rarely occur in trouble- 

 some quantity on good mellow soils which 

 are warm and abundantly underdrained. As 

 a matter of fact, their presence would be taken 

 as a very index to the fact that the soil lacks 

 humus. They are nature's most efficient 

 agents in transforming a cold tight soil which 

 lacks humus, and is therefore somewhat 

 unresponsive in cultivation, into a soil that 

 is warmer and generally better adapted for 

 plant growing. They are kept out of tennis 



