Diseases and pests Trees 13 Rice 10 Grain 9 Forest insects 7 Congresses 6 Insect pests 6 Control 5 Field crops 5 Identification 5 Storage 5 Agricultural pests 4 Conifers 4 Legumes 4 Potatoes 4 Citrus 3 Corn 3 Diseases and injuries 3 Grasses 3 Tropical crops 3 Wheat 3 Alfalfa 2 Aphididae 2 Bananas 2 Breeding 2 Brown rot 2 Economic aspects 2 Farm produce 2 Forests and forestry 2 Nilaparvata lugens 2