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P. washingtonensis is a weak canker pathogen to apple trees, but while commercial trees in orchards don't seem to be at risk, crabapple pollinators can be susceptible. [3] The fungus causes small black dots (fruiting bodies) to form on infected twigs and tree branches.
Viroid diseases; Swollen apple Apple fruit crinkle viroid (AFCVd) Apple dimple fruit Apple scar skin viroid (ASSVd) Apple fruit crinkle Apple fruit crinkle viroid (AFCVd) (Japan) Apple scar skin = apple dapple, apple sabi-ka, apple bumpy fruit Apple scar skin viroid (ASSVd)
Botryosphaeria stevensii (Apple sphaeropsis) is a fungal plant pathogen that causes cankers on several tree species including apple and juniper as well as causing cankers on grape vines. [3] It causes branch dieback, possibly affecting a large portion of the tree canopy, and if severe it can kill entire plants. [4]
Woolly aphids on crab apple bark. Pemphigus gall on cottonwood tree Grylloprociphilus imbricator on Fagus Galls made by Melaphis rhois. Woolly aphids (subfamily: Eriosomatinae) are sap-sucking insects that produce a filamentous waxy white covering which resembles cotton or wool. The adults are winged and move to new locations where they lay egg ...
The fruit holds its shape, however, unlike other fruit diseases. The fruit will then wither up and can remain on the tree for another year before falling off. During this time pycnidia appear on the surface of the rotted fruit. [1] Frogeye leaf spot. In leaves the fungus begins by causing purple specks on infected leaves. [3]
Apple trees can recognize invading pathogens and mount a defense. [4] Often, the plant may be able to resist the pathogen, even though it has no genetic resistance to same. Apple trees seem to have a weak defense to A. mali , base on the fact that no survivors if leaves has been infected.
Sclerotinia sclerotiorum is a plant pathogenic fungus and can cause a disease called white mold if conditions are conducive. S. sclerotiorum can also be known as cottony rot, watery soft rot, stem rot, drop, crown rot and blossom blight. A key characteristic of this pathogen is its ability to produce black resting structures known as sclerotia ...
Planting of less susceptible apple cultivars, horticultural practices that promote tree health and reduce fruit wetness hours, removal of overwintering diseased twigs and fruit, and fungicides Bitter rot of apple is a fungal disease of apple fruit that is caused by several species in the Colletotrichum acutatum and Colletotrichum ...