This practice also helps prevent the soil from being depleted of nutrients, which in turn can make plants less vigorous and more susceptible to disease. Select disease-resistant varieties. Tomatoes, roses, and fruit trees are susceptible to a number of diseases, but certain varieties are resistant. Plant tags often give information on whether a particular plant is disease resistant. For example, tomato tags often are marked with V, N, T, or F. V signifies resistance to Verticillium, which causes premature wilt and reduced fruit production.
N refers to plants with nematode resistance.
T signifies resistance to tobacco mosaic virus, and F means resistance to Fusarium wilt. Tomato varieties known Carmen, Carnival, Casino Royale, Cavalier, Celebrity, First Lady, Milagro, and President. The fungal diseases rust, powdery mildew, and black spot are common problems on roses. By choosing the right rose, you can avoid the problems associated with these diseases. Apples and crabapples are susceptible to a number of diseases, including apple scab, fire blight, and powdery mildew.