Maria Crabapple - Malus 'Maria'
Maria crab shows only fair resistance to the big four:
apple scab, mildew, fire blight and cedar-rust [3]
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Maria Crabapple
Maria Crabapple - Malus 'Maria'  is 19 years old [2]
Maria Crabapple is a compact tree that typically matures to 10’ tall and as wide. Spectacular pink blossoms are well-accented by maroon-over-green foliage. Maria crab shows only fair resistance to the big four: apple scab, powdery mildew, fire blight and cedar-rust.

Disease resistance should be your primary consideration. Many resistant cultivars are available and recommended in order to avoid the most common disease problems. Before making a selection, keep in mind that not all crabapples do well in every location. Disease intensity varies from region to region, and disease strength can vary from year to year. For instance, some crabapples will be more prone to disease susceptibility in areas with greater rainfall than in drier climates [3].

Apple scab is one of the most serious diseases from an aesthetic standpoint, but usually not a serious threat to the health of the tree. It is a fungal disease, which develops in cool, wet springs. On susceptible crabapples, apple scab causes spotting of the leaves, premature defoliation, and unsightly spots on the fruit. Cedar- apple rust is a less serious leaf-spotting disease common to our native crabapple cultivars. It is usually a problem in areas where native junipers (Juniperus) are planted. Selecting resistant cultivars can control this disease.

Powdery mildew is a fungal disease that can cause considerable damage to leaves and fruit of susceptible cultivars without threatening the health of the tree. Poor air circulation, close association with susceptible apple cultivars, and wet, humid weather conditions will greatly influence disease incidence and severity. [3]

Maria Crabapple Blossoms
Fire blight, caused by the bacterium Erwinia amylovora, is a common and frequently destructive bacterial disease of pome fruit trees and other related plants. Pear and quince trees are extremely susceptible. Apple, crabapple, and Pyracantha species are also frequently damaged. Fire blight most commonly attacks blossoms, but it can also infect succulent tissues of shoots and water sprouts (root suckers). Infections may extend into scaffold limbs, trunks, or root systems, and may kill highly susceptible hosts.

Fire blight occasionally attacks hawthorn (Crataegus species), Spiraea, Cotoneaster, toyon (Photinia species), juneberry or serviceberry (Amelanchier species), loquat, mountain ash (Sorbus species), and other related plants. Fire blight infections can destroy limbs and even entire shrubs or trees. [4]

Maria Crabapple blossoms & foliage
References
  1. Morton Arboretum, Crabapple: A Tree For All Seasons
  2. Maria Crabapple - Malus 'Maria', Morton Arboretum acc. 71-90*1, photos © Bruce Marlin
  3. Morton Arboretum, Crabapples for the Home Landscape
  4. Beth Teviotdale, Pest Notes "Fire Blight" UC ANR Publication 7414
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