193 





YOUNG KALO. 



Each plant has put forth two or three leaves. Note the irrigation 

 water in lower right-hand corner; the adjoining patches; the embankments; 

 the manner in which the soil has been broken up. The banks are covered 

 with Jionohono (Oplismenus compositus.) 



INSECT CONTROL. 



The following" extracts are from notes by C. R. Jones, ento- 

 mologist, in the Philippine Agricultural Rcvicn': 



The losses caused by insects to various crops, garden truck, 

 and shade trees is far in excess of that supposed by the general 

 observer. This loss is steadily on the increase instead of on the 

 decrease, due to the fact that agricultural areas are becoming 

 larger, thus destroying natural food plants of insects and intro- 

 ducing a new environment. Insects that were formerly unknown 

 as a pest may become noxious on closely allied cultivated plants 

 due to the change in environment and the destruction of the 

 normal host plant; thus we see that the injuries caused by insects 

 and the loss in money value are gradually increasing. 



There are several factors which come under the head of natural 

 agencies regarding the control of insects ; these may be classed as 

 climatic conditions, and predatory and parasitic enemies. In the 

 control of an insect pest, we should, in addition to these combined 

 natural agencies, apply our artificial means in an energetic, syste- 



