48 



MISC. PUBLICATION 62 6, U. S. DEPT. DF AGRICULTURE 



Figure 77. — Cottony maple scale on 

 twigs. About twice natural size. 



Treatment. — Spraying with a misci- 

 ble oil or oil emulsion in the spring 

 before the buds open will usually give 

 good control. In the summer, when 

 the young are hatching, many of them 

 can be killed by spraying several times 

 at about 2-week intervals with a nico- 

 tine sulfate and soap solution, or a 

 combination of white-oil emulsion and 

 nicotine (p. 101). Where a light infesta- 

 tion occurs on low shrubs, many of the 

 insects can be rubbed off with a brush 

 soon after the egg sacs have begun to 

 form and before hatching has begun. 

 Care should be taken not to injure the 

 bark. 



Scurfy Scale 



The scurfy scale (Chionaspis furfura 

 (Fitch)), (fig. 78), occasionally injures 

 hawthorn. It also infests such trees as 

 apple, ash, elm, and willow. This 

 scale insect is similar to the dogwood 

 scale (p. 41) in appearance and habits. 



Treatment. — Same as for the dog- 

 wood scale (p. 41). 



Other Pests of Hawthorn 



Page 



San Jose scale 57 



Rose scale 81 



Spider mites . 11 



f # 



Figure 78. — The scurfy scale. About 

 twice natural size. 



HIBISCUS 

 Japanese Beetle 



In several eastern States where the 

 Japanese beetle (Popillia japonica 

 Newm.) is abundant, the foliage and 

 flowers may be completely destroyed 

 on many plants. Hibiscus (or shrub- 

 althea), flowering quince, flowering 

 peach, flowering cherry, rose, hollyhock, 

 dahlia, zinnia, and Virginia creeper are 

 the garden plants most likely to be 

 injured. The beetles feed during the 

 warm part of the day, attacking the 

 flowers (fig. 79) or skeletonizing the 

 leaves and causing the remnants to 

 burn brown and fall. The larvae, or 

 grubs, feed on the roots of grasses and 

 certain cultivated plants and often 

 cause serious damage to lawns. The 

 beetle is bright metallic green, with 



