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5 Problems Affecting Crop ProductionContinued Page
Relation of Survey Work to a Plant Disease Research and Control
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acreage acres annual Argentina associations average basis beans Brazil breeder breeding cacao carried cattle cent coffee cooperation corn cotton crops cultivation dairy Department of Agriculture determine disease survey effect entomologists eradication erosion established experiment stations extent factors farm farmers Federal Federal Farm Board feed fiber field forage forest forestry fruits fungi fungus Government grain grass grazing green manure Group and commodity grown growth henequen improvement insects investigations irrigation laboratory land classification large number legumes livestock maize marketing ment methods milk NUMBER OF LIVESTOCK organization Pan American Union parasites pasture pests plant diseases Plant Introduction Plant Quarantine possible practical present problems quarantine regions reports rubber scientific seed selection Short tons sisal soil surveys species square mile Sugar tests tick timber tion tobacco trees tropical America U. S. Department utilization varieties various vegetable wheat wood