136 



INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



rant, elm, euonymus, grape, gooseberry, hackberry, hawthorn, lilac, 

 linden, locust, honey-locust, maple, mountain ash, mulberry, oak, 

 orange, osage orange, peach, pear, plum, poplar, quince, rose, sarsa- 

 parilla (Aralia japonica), Spircea, sumach, sycamore. Viburnum denta- 

 tum, willow and woodbine (Ampelopsis veitchii). 



Fig. 115. — The cottony maple or vine scale, Pulvinaria 

 vitis (Linn.). Mature females on maple twigs. Larvse of 

 Hyperaspis signata Oliw. on leaf at the left. Natural size. 

 The specimens were received from John J. Davis, Lafay- 

 ette, Ind. (Original) 



Control.— Kerosene and carbolic acid emulsions, or resin wash, 

 applied when the young are hatching, will aid in reducing the coming 

 broods. 



Natural Enemies. — There are many natural enemies preying upon 

 this scale, including the ladybird beetles, Rhizobius ventralis Er., 

 Hyperaspis signata Oliv. and the internal parasites, Coccophagus 

 lecanii and Microterys flavus. Hyperaspis signata Oliv. does not occur 

 in California. 



THE JAPANESE OR MEXICAN WAX SCALE 



Ceroplastes cerifcrus (Anderson) 



(Coccus ceriferus Anderson) 



(Fig. 116) 



Description.— The bodies of the adults are covered with thick, white 

 wax. causing them to appear like lumps of dough stuck to the branches. 



