THE MONTHLY BULLETIN. 



103- 



Fumigation has often given excellent killing results, but is not at 

 all recommended for this pest, unless some other destructive scale 

 insect, such as red, yellow, black or purple scale, is present and needs 

 that treatment. Experience has shown that an excessive dose gives 

 little better result than the ordinary black-scale dosage (one half to 

 three fourths of Schedule No. 1). 



||>"|PJ 



Fig. 83. — Adult females of the citrus mealy bug on a lemon leaf. 

 (Essig-, P. C. Jr. Ent. ) 



Natural Enemies. — The ladybird beetle, Cryptolmnus montrouzicri. 

 is the most important natural check, though the following insects prey 

 upon this pest: the ladybird beetles, EJiizohlus ventralis, Lindorus 

 lopanthce, Scymnus guttulatus, S. sordidus, S. margimcollis, Crypto- 

 gonus orbiculus, Hyperaspis lateralis ; the green lacewing, Chrysopa cali- 

 fornica Coq. ; the brown lacewing, Sympherohius angustus Bks. ; the 

 hymenopterous parasites. CJirysoplatycerus spleitdens How.. Clieilo- 

 neurus dactylopii How. and the dipterous parasite, Leucopis hella Loew. 



