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That’s powdery mildew, a fungus that affects a wide range of fruits, vegetables and flowers, coating their leaves, stems, blossoms and, in severe cases, entire plants. It isn’t pretty.
Powdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of ascomycete fungi in the order Erysiphales . Powdery mildew is one of the easier plant diseases to identify, as the signs of the causal pathogen are quite distinctive.
The genus comprises herbaceous perennial plants, shrubs, and rarely small trees, growing 0.5–6 m (1.5–19.5 feet) tall, with bipinnate leaves. The flowers are produced in cylindrical or globose inflorescences and have numerous long slender stamens which give rise to the common names powder-puff, powder puff plant, and fairy duster.
The plants are generally slow-growing with some species growing to 25 m (82 ft) tall. The type species is the European holly Ilex aquifolium described by Linnaeus. [2] Plants in this genus have simple, alternate glossy leaves, frequently with a spiny leaf margin. The inconspicuous flower is greenish white, with four petals.
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Prunus ilicifolia flowers. It is an evergreen shrub [4] or small tree approaching 15 metres (49 feet) in height, [12] with dense, hard leaves [4] (sclerophyllous foliage). The leaves are 1.6–12 centimetres (3 ⁄ 4 – 4 + 3 ⁄ 4 inches) long with a 4–25 millimetres (1 ⁄ 8 –1 in) petiole [12] and spiny margins, somewhat resembling those of the holly.
A ratio of three female plants to one male plant is required for ideal fruit production. [11] The current world record American Holly tree is located in Rose Bud, White County, Arkansas. According to the National Forests Champion Trees Official Register, it boasts a trunk circumference of 182 inches, a height of 64 feet, and a crown spread of ...
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