Diseases and pests 404 Control 342 Spraying and dusting in agriculture 195 Agriculture 190 Soils 92 History 81 Peach 81 more ... Apples 74 Parks 65 Law and legislation 55 Fruit 51 Soil surveys 51 Fertilizers 48 Seeds 48 Fishing 47 Seed adulteration and inspection 47 Legumes 46 Forests and forestry 45 Inoculation 45 Research 45 Economic aspects 44 Trees 42 Agricultural exhibitions 41 Gardening 36 Poultry 36 Varieties 36 Vegetables 35 Fruit trees 33 Tomatoes 32 Agricultural extension work 31 less ...