INJURIOUS INSECTS OF 1903. 



53 



a. Fixed to Bark: 



Producing an ashy-gray incrustation on the bark ; scales 

 round, and gray and black. 



SAN JOSE SCALE. 



Fig. 22. — Asl'idiotus perniciosus, Comst. a, infested twig, natural size; /', bark as it 

 appears under a hand lens, showing scales in various stages of development, and 

 young larvae. From Div. of Entomology, Dep. of Agriculture. 



Remedies: In spring before buds open, spray with (i) lime sulfur 

 salt, or (2) 40 per cent kerosene in water (Kero-water sprayer). Use 

 hydrocyanic acid gas, which see in article on Fungicides and Insecticides. 



