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Black knot occurs only on the woody parts of trees, primarily on twigs and branches, but can spread to larger limbs and even the trunk. Olive-green swellings from the disease are visible in the late spring; as it spreads and matures, typically by autumn, rough black knots circle and kill affected parts. The knots vary in diameter from one inch ...
Viral diseases; Bare twig and unfruitfulness genus Nepovirus, Strawberry latent ringspot virus. genus Tobamovirus, Cucumber green mottle mosaic virus. Line pattern & Necrotic ring spot genus Ilarvirus, Prunus necrotic ringspot virus (PNRSV) Peach mosaic genus Trichovirus, Cherry mottle leaf virus (CMLV) Plum pox (= Sharka)
Taphrina pruni is a fungal plant pathogen of blackthorn (Prunus spinosa) that causes the pocket or bladder plum gall, a chemically induced distortion of the fruit (sloes), producing swollen on one side, [1] otherwise deformed and flattened fruit gall without a stone. [2] The twigs on infected plants may also be deformed with small strap-shaped ...
genus Nepovirus, Tomato black ring virus (TBRV) Infectious bud failure genus Ilarvirus, Prunus necrotic ringspot virus (PNRSV) Peach mosaic Cherry mottle leaf virus: Peach yellow bud mosaic genus Nepovirus, Tomato ringspot virus (ToRSV)
The disease spreads most quickly during hot, wet weather and is dormant in the winter when temperatures drop. [citation needed] The pathogen spreads through the tree from the point of infection via the plant's vascular system, eventually reaching the roots and/or graft junction of the plant. Once the plant's roots are affected, the death of the ...
Brachycaudus helichrysi is a serious pest of stone fruits. It forms dense colonies on the underside of the leaves of the primary host causing curling, [4] twisting and distortion of the foliage, the shedding of flowers and the dropping of young fruit. [8] It is one of several species of aphid that can transmit the virus that causes plum pox. [8]
In California and Idaho, it has been found on plum and prune trees. In Europe, the disease can be found on apricots, peaches, and cherries. Leucostoma canker has also been witnessed in South America and Japan. [1] The spread of disease is favored in cool, wet, and humid conditions in late fall or early spring when conidia are most abundant.
Branch knot Sphaeropsis tumefaciens: Brown rot (fruit) Phytophthora citricola Phytophthora citrophthora Phytophthora hibernalis Phytophthora nicotianae var. parasitica = Phytophthora parasitica Phytophthora palmivora Phytophthora syringae. Charcoal root rot Macrophomina phaseolina: Citrus black spot Guignardia citricarpa: Damping-off Pythium sp.