All of the listed factors - birds, dust blowing, rain, and wind blowing - can contribute to the spread of plant diseases Statement 1 is correct: Birds can act as vectors, carrying and spreading plant pathogens from one location to another through their feathers, feet, or droppings. Statement 2 is correct: Dust and soil particles blown by the wind can carry and spread plant diseases, especially fungal spores and bacterial cells. Statement 3 is correct: Rain can splash and disperse plant pathogens, such as fungi and bacteria, from the soil or infected plant parts to uninfected plants. Statement 4 is correct: Wind can transport and spread airborne plant pathogens, such as fungal spores and bacterial cells, over long distances.