PEAR GROWING IN CALIFORNIA. 407 



atomic sulphur or some other good fungicide in the early spring when 

 the first application is made for codling moth just as the blossoms have 

 dropped. By going over the orchard once at this time with this com- 

 bined spray both scab and codling moth are controlled. 



Professor George P. Gray, Chemist, Insecticide and Fungicide Labor- 

 atory of the University of California, has prepared a compatibility 

 chart of insecticides and fungicides which shows at a glance which may 

 be mixed with safety, which are dangerous combinations, which are 

 doubtful, etc. It is believed that this chart will be exceedingly valuable 

 to the pear growers of California and it is therefore being used in 

 connection with this article. Professor Gray printed this chart origin- 

 ally in Circular No. 195, March, 1918. 



189 



