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Botryosphaeria obtusa is a plant pathogen that causes frogeye leaf spot, black rot and cankers on many plant species. [1] On the leaf it is referred to as frogeye leaf spot; this phase typically affects tree and shrubs. In fruit such as the apple, cranberry and quince, it is referred to as black rot, and in twigs and trunks it causes cankers. [1]
Phomopsis canker, fruit decay and rough bark Phomopsis mali Diaporthe perniciosa [teleomorph] Phymatotrichum root rot = cotton root rot Phymatotrichopsis omnivora = Phymatotrichum omnivorum. Phytophthora crown, collar and root rot = sprinkler rot Phytophthora spp. Phytophthora cactorum Phytophthora cambivora Phytophthora cryptogea Phytophthora ...
In trees, heart rot is a fungal disease that causes the decay of wood at the center of the trunk and branches. Fungi enter the tree through wounds in the bark and decay the heartwood . The diseased heartwood softens, making trees structurally weaker and prone to breakage.
When Not to Prune Apple Trees. There are several reasons not to prune an apple tree. One is if the tree is very young, especially if it's grown from seed, as it won't have a well-established root ...
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 ...
It is a weak orchard pathogen and a cause of rubbery rot, also known as speck rot, in postharvest apples. First described in North Germany, it affects several apple varieties, including commercially important Jonagold and Elstar. Losses caused by P. washingtonensis during storage are usually below 1% but can reach 5–10% of apples. [2]
The diagnosis of a P. cactorum infection of trees, is based on the identification of symptoms, in particular the oozing cankers, and confirmation of symptoms in a diagnosis lab or utilization of a field ELISA detection kit. [3] P. cactorum can be a major problem in apple orchards, as it can cause crown, collar, and root rots in apple trees.
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]