ISO 



INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



horse-chestnut, English huckleberry, lilac, linden, locust, honey-locust, 

 loquat, maple, milkweed, mulberry, orange, osage orange, trifoliate 

 orange peach, pear, sand pear, pecan, persimmon, Photinia villosa, 

 plum, poplar, California privet, common privet, prune, quince, 

 Japanese or flowering quince, raspberry, rose, sassafras, shad-bush, 

 silver thorn, smoke bush, snowball, snowberry. Spiraea, sour gum 

 (Nyssa), strawberry, sumach, Virginia creeper, English walnut, black 

 walnut and willow are among the food plants. 



Fig. 157. — The pernicious or San Jose scale, Aspidiotus perniciosus Comst, on 

 pear and willow. The pear was taken in Imperial County by F. W. Waite. Natural 

 size (Original) 



Control. -The application of commercial lime-sulphur spray (1 to 

 9 or 1 to 11 of water) during the dormant season in the winter, as a 

 driving spray has given good results. Care should be taken to 

 thoroughly cover every portion of the tree. 



Natural Enemies — The internal hymenopterous parasites, Aphelinus 

 fuscipennis How., A. mytilaspidis LeB., Aspidiotiphagus citrinus 

 Craw., Anaphes gracilis How.. 101 and the two-stabbed ladybird beetle 



""Yearbook, U. S. Dept. Agric. p. 254, 1894. 



