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Drops of orange liquid may be visible on the spots. Later in the season, black dots appear on the orange spots on the upper leaf surface. In late summer, tube-like structures develop on the undersurface of the apple leaf. Infected leaves sometimes drop prematurely, particularly during drought conditions or when the tree is under additional stress.
Irregularly shaped and sometimes lopsided, the apple is usually round to conical in shape and flattened at the base with distinct ribbing. Weather conditions during ripening cause a marbling or water coring of the flesh, and in very hot weather, the fruit will ripen prematurely. S genotype S1 S9 S21; Vitamin C is high 30 mg / 100 gram. [2]
It is very sweet, with an unusual flavor of sugar cane, or spicy cherry candy. The fruit can store for 5 to 8 weeks. The Sweet Sixteen is quite vigorous. The fruit may have premature drops. Sweet Sixteen usually ripens, mid- to late September. [2] The Sweet Sixteen is resistant to fire blight and scab.
Plum curculio beetles can cause irreparable damage to a fruit harvest. In badly damaged fruit, one can identify large scars and bumps due to feeding. Most internally damaged fruit (through burrowing into the fruit) drops prematurely.
Brooks fruit spot is a minor disease of the apple and is found mostly throughout the Northeast and Mid-Atlantic regions. As the fruit first emerges the disease appears as dark green lesions on the fruit of the apple. As the apple begins to emerge these blemishes grow and change to purple or green. [14]
Apple chat fruit MLO, also known as "apple small fruit" and "chat fruit of apple", [1] is a mycoplasma-like organism (MLO) [2] that affects only apple trees, specifically Lord Lambourne and Tydeman's Early Worcester, [3] though in North America, Turley, Winesap, Jonathan, and Golden Delicious can be affected. [4]
Apple scab is a common disease of plants in the rose family that is caused by the ascomycete fungus Venturia inaequalis. [1] While this disease affects several plant genera, including Sorbus, Cotoneaster, and Pyrus, it is most commonly associated with the infection of Malus trees, including species of flowering crabapple, as well as cultivated apple.
Bitter rot of apple is a fungal disease of apple fruit that is caused by several species in the Colletotrichum acutatum and Colletotrichum gloeosporioides species complexes. [1] It is identified by sunken circular lesions with conical intrusions into the apple flesh that appear V-shaped when the apple is cut in half through the center of the ...