108 



THE MONTHLY BULLETIN. 



same insect. Vedalias were placed in the cage and they were observed 

 to feed quite as readily on the pear infesting leerya as on the citrus 

 form. 



There is a spraying campaign going on at present in the San Jose 

 section against this pest on pears. The material used is an oil spray. 

 This spray is also very destructive to all stages of Vedalia, especially 

 when applied as a very strong winter spray. The outcome of this cam- 

 paign will be Avatched with interest. 



Pjq 21 — The cottony cushion scale, Icerya purchasi. (Cal. 



Hort. Com.) 



With the above explanation Vedalia is now out of the question as a 

 means of control against the scale on pear trees. Pears can not be 

 successfully grown without spraying for the codling moth. Hence 

 the leerya' must be handled by some artificial means. Neither spray- 

 ing nor fumigation have as yet proved sufficiently effective against it, 

 and the same problem that confronted the citrus growers in the early 

 eighties may confront the pear growers of today. It may be that 

 Lestophonus and Ophelosia, the two internal parasites of Icerya, may 

 prove of value in this instance. In some localities Lestophonus is 

 quite as effective as Vedalia. The problem presented is a difficult one. 



