INJURIOUS AND BENEFICIAL INSECTS OP CALIFORNIA. 17 



squash, strawberry, sunflower, Thunbergia, tomato, verbena, violet, Eng- 

 lish and black walnut, watermelon and various weeds. 



Control. — Control measures are the same as for the red spider. 



An experiment with atomic sulphur in the Fair Oaks section of 

 Sacramento County in- the month of July, 1914, is reported by Mr. 

 G. P. Weldon to be exceedingly satisfactory. The following propor- 

 tions were used: 



Atomic sulphur 10 pounds 



Water 100 gallons 



From ninety-five to ninety-eight per cent of the mites were killed 

 with a single application and no damage was done to the foliage or 

 fruit. 



Natural Enemies. — The small ladybird beetles (Stethorus vagans 

 Blackb., 8. picipes Casey, Scymnus marginicollis Mann., 8. nanus Lee), 

 the larvge of the green lacewing (Chrysopa calif omica Coq.), the dark 

 Triphleps (Triphleps tristicolor White) and many other insects prey 

 upon this species. 



2—13664 



