59 



kill the tree a'lso. Sometimes digging out is resorted to 

 and a-gain repel'lants are used, such as the Kerosene Car- 

 bolic Acid Emulsion used for scale or Carbolineum. 

 Kainit spread around the tree is also of some use, but 

 the best remedy is plenty of fertilizer and irrigation, 

 which -causes the tree to outgrow the damage done by 

 the grub. 



Of sucking Insects various scales, a white fly and two 

 species of red spider attack the tree and a rust mite 

 attacks the fruit. Some of the scale insects like the Wax 

 Scale and Hemispherical Scale are called soft scales, and 

 they are readily kept in check by spraying with whale 

 oil soap or kerosene emulsions. Other scales having a 

 hard covering are much more difficult to destroy. Those 

 giving the greatest trouble are the Purple Scale, the 

 White or Orange Snow Scale and the Florida Red Scale. 

 All of these are rather difficult to kill, and the Purple 

 Scale especially so. An ounce of preventive is in this 

 case worth more than the proverbial pound of cure, and 

 windbreaks are the preventive. If it becomes necessary 

 to spray, several mixtures may be used, but the following 

 recommended in the Porto Rico Experiment Station Bul- 

 letin No. 10, is probably as effective as any and practical 

 enough for any planter to use. 



Kerosene and Crude Carbolic Acid Emulsion: 



Stock Solution. 



Kerosene 2 gallons 



Water 1 



Soft Soap 1 quart 



or 



Common Washing Soap ^ pound 



Crude Carbolic Acid 1 pint 



