Avoid M9 and M26 apple rootstocks, which are highly susceptible to fire blight. Crabapple cultivars less susceptible to cedar apple rust include:įor more detailed information on cedar apple rust, visit Cornell's plant clinic and cooperative extension pages.įor tips on a variety of gardening topics, see our Plant Information Guides. When considering new plantings, select disease-tolerant cultivars and rootstocks. To control cedar apple rust, junipers must be removed from the vicinity of the crabapples, and fungicides used if necessary. Malus 'Schmidtcutleaf' Golden Raindrops®īecause of regional differences in disease resistance, consult Cornell Cooperative Extension, University of Connecticut, Rutgers or your local agricultural cooperative extension for information specific to your area.Ĭedar apple rust is a fungal disease which needs two hosts: apple or crabapple trees, and eastern red cedar ( Juniperus virginiana) or other junipers. Orange-colored galls overwinter on the junipers and in spring produce spores which are air-carried to apple and crabapple trees. Leaves of infected trees develop bright orange or yellow spots eventually the trees may become severely defoliated.It is caused by the bacteria Erwinia amylovora, which can infect fruit, flowers, twigs, and leaves of infected plants. Here is a partial list of crabapple cultivars that have proved resistant to apple scab, fire blight, and powdery mildew in the Northeast: Fire blight is a serious bacterial disease that affects apple trees, as well as other hosts such as pear, crabapple, and mountain ash. The disease is generally common throughout the United States wherever apples are grown. At short time periods between injection and inoculation, trunk-injected bactericides, and plant resistance inducers showed good potential in fire blight control on apple flowers and shoots. Fire blight is a destructive bacterial disease of apples and pears that kills blossoms, shoots, limbs, and, sometimes, entire trees. The International Ornamental Crabapple Society, a network of public gardens with extensive crabapple collections, assesses these flowering trees annually for disease resistance as well as aesthetic qualities.ĭisease resistance varies in different parts of the country. For example, a cultivar that succeeds in the northeast, where apple scab is the most common disease, may not thrive in the south, where fire blight is a more pressing issue. This study contributes new knowledge on fire blight management using tree injection as an alternative delivery approach for plant protective compounds. Because the blights are fungi and spread easily, it is so hard to protect your trees. the diseases that the Enterprise apple tree is resistant to are the most common culprits for apple trees that fail to thrive. 10 Botany (Taxonomy, Nomenclature and Morphology)Ĭrabapples ( Malus spp.) are susceptible to several diseases, most prominently apple scab, fire blight, powdery mildew, and cedar apple rust. Enterprise apple trees are considered easy to grow, so they are great trees for first-time apple planters.
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