CONTEXTS V 
Page 
Control of plant diseases 51 
White pine blister rust 51 
Improved methods aid ribes removal 51 
Ribes bushes removed from 1,679,000 acres 52 
Rust spread in southern Applachians 53 
Ribes sprayed with 2,4-D formulations by helicopter 53 
Survey shows rust losses in western pine stands 53 
Barberry eradication to control stem rust 54 
New and uncommon races of rust found on barberry 54 
Stem rust light in 1948 54 
Regulation of barberry planting stock strengthened 55 
Chemicals aid removal of barberry bushes 56 
Barberry varieties tested for susceptibility to stem rust 56 
Dutch elm disease 56 
Inspection for peach diseases protects industry 57 
Resurvey fails to reveal citrus canker in Texas 57 
Insect identification and classification important aids to control programs. 58 
In-transit inspection 58 
Inspection service in District of Columbia 58 
Foreign plant quarantine activities 59 
Carriers and products inspected 59 
Plants and pests intercepted 61 
Treatment of imported plant material 62 
Certification for export 62 
Organization of Bureau 63 
