كتب ذات صلة

Spraying with "black leaf 40" to control onion thrips.

Spraying crops why, when, and how

The season''s work on arsenical poisoning of fruit trees.

The reduction of domestic flies

• A new technique in control of the house fly.
  المؤلفون: Bruce, Willis Nels.
• Control of horse flies on cattle
  المؤلفون: Bruce, Willis Nels. ,  Decker, G. C.