298 



THE CITRUS FRUITS 



The amount of the insect damage is largely controlled by 

 the climate. In one region a certain insect pest will pre- 

 dominate and do great damage while in another region a 

 different insect will do the greatest damage. Each citrus 

 region usually has some well-defined insect which may not 

 be serious in any other region. 



Fig. 126. — An orange tree partly killed by the red scale. (After Quayle, 

 California Agriculture Experiment Station.) 



The control and eradication of all citrus insects is based 

 principally upon sanitation. All weeds should be destroyed. 

 The fence rows should be clean and rubbish which harbors 

 insects should be removed. Where perfect sanitation exists 



