Tree has good disease resistance to apple scab and powdery mildew. Citrus scab and alternaria fungus disease attack Murcotts. The sores can burst which then crust over with a yellowish or brownish scab. Venturia inaequalis is an ascomycete fungus that causes the apple scab disease. Some signs and symptoms are vesicles that fill with pus, rupture, and scab before healing. This antagonistic fungus has demonstrated significant bioactivity against apple scab. Lesions heal with a scab characteristic of herpetic disease. Three of the more common diseases or pests are mildew, aphids, and apple scab. Other potato diseases include "Rhizoctonia", "Sclerotinia", black leg, powdery mildew, powdery scab and leafroll virus. Many rabbits will survive and the cutaneous lesions gradually scab and fall off, leaving scarring. This looks like a scab with redness and swelling around it. This subsequently leads to itch and rubbing, followed by further inflammation, exudation, and scab formation. The term "eschar" is not interchangeable with "scab". Cultivars, such as 'Elliot', are increasing in popularity due to resistance to "Pecan scab". It is also known as sheep scab and cattle scab.