REMEDIES FOR SCALE INSECTS 



175 



the insect is found; the female produces either living young or 

 eggs, and the young scales crawl about for a time before becoming 

 permanently located, after which they secrete their own covering 

 scale. 



This group is subject to the attack of many parasites and pre- 

 daceous insects. Among the latter, "lady beetles" or "lady birds" 



Fia. 192. The broad scale. 



Fio. 193. Cottony cushion scale on 

 orange twig. (Quayle, Cal. Bull., 214.) 



are the most prominent and the most useful. Any effort to eradi- 

 cate scale insects must naturally result also in the death of many 

 beneficial forms preying upon them. But, inasmuch as citrus 

 growers cannot depend upon the services of the latter, radical 

 treatment must be resorted to. 



Remedies for Scale Insects. Spraying has been largely super- 

 seded by fumigation, but is still in use in many orchards. For 

 citrus trees, kerosene emulsion is probably the safest of the various 



