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Grain
21
Virus diseases of plants
20
Tomatoes
19
Forest insects
18
Soybean
18
Field crops
17
Grapes
17
Peanuts
17
Pests
17
Turfgrasses
17
Wheat
15
Environmental aspects
14
Varieties
14
Plant diseases
13
Weed control
13
Apples
12
Greenhouse plants
12
Pine
12
Disease and pest resistance
11
Host plants
11