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Peach tree leaves displaying various stages of the shot hole disease: brown spots on the leaf with conidium holders in the middle (center) that eventually fall off, leaving BB-sized holes behind (left) Shot hole disease of apricot leaves. The fungal pathogen Wilsonomyces carpophilus affects members of the Prunus genera. Almond, apricot ...
Included in this genus are multiple species of trees and shrubs, such as: Dibotryon morbosum infects are Prunus serotina (wild cherry trees), Prunus persica (peach trees), Prunus domestica (plum trees), and Prunus cerasus (sour cherry trees). [3] The main symptom of Dibotryon morbosum is its “knot-like” gall structure. These knots can vary ...
Symptoms on orchard trees can include death of buds and roots, reduced tree survival and uniformity, [8] and increased susceptibility to winter injury. [2] Some common symptoms also include necrotic “shot holes” in leaves or rugosity and mosaic symptoms. [9]
Some trees were sprayed in 1945 at the end of the growing season and some trees were not. All of the trees that were sprayed in the fall of 1945 survived and produced fruit in 1946. Yields for the unsprayed trees that survived were 36 pounds per tree. Sprayed trees yielded nearly three times more than the controls with 107 pounds per tree. [22]
Buchanania mangoides is a small tree growing up to 13 m (43 ft) tall, with a trunk less than 30 cm (12 in) diameter. The leaves are similar to those of the mango - they are oblong to obovate and may reach 40 cm (16 in) in length and 7 cm (2.8 in) wide, with up to 25 pairs of lateral veins on either side of the midrib.
A fungus in the genus Taphrina often attacks the plums; the young ovaries swell, often much larger than full grown plums, become hollow and often persist on the tree in winter. Known as "plum pockets", they appear pale green, leathery to the touch, and hollow with the exception of a few fibrous bands. The disease reduces regeneration of the plums.
Prunus cerasifera is a species of plum known by the common names cherry plum and myrobalan plum. [3] It is native to Southeast Europe [ 4 ] [ 5 ] [ 6 ] and Western Asia , [ 3 ] [ 7 ] and is naturalised in the British Isles [ 4 ] and scattered locations in North America.
The pear slug is an important pest that eats leaves of cherry, pear, and plum trees, leaving behind a skeleton of veins. The larvae cover themselves in green slime, making themselves unpalatable to predators. The larva molt between five and eight times before being fully grown. [1]