Physalospora disrupta

Physalospora disrupta is a species of fungus in the family Botryosphaeriaceae. It is a plant pathogen that primarily affects apple trees, causing a disease known as apple blotch.

Taxonomy

The species was first described in 1915 by American mycologist George Francis Atkinson. The genus name Physalospora comes from the Greek words physa, meaning bladder, and spora, meaning seed, referring to the characteristic spore-bearing structures of these fungi. The species name disrupta refers to the disruptive effect the fungus has on its host plants.

Description

Physalospora disrupta produces small, black, spherical fruiting bodies known as pycnidia. These structures contain numerous spores, which are released into the environment to infect new hosts. The fungus primarily affects the leaves of apple trees, causing dark, irregularly shaped lesions. If left untreated, the disease can lead to significant yield loss.

Distribution and habitat

Physalospora disrupta is found worldwide, but is particularly prevalent in regions with a temperate climate, such as the United States, Europe, and Asia. It thrives in humid conditions and is most active during the spring and fall.

Management

Control of Physalospora disrupta involves a combination of cultural practices and chemical treatments. Regular pruning of infected branches and removal of fallen leaves can help to reduce the spread of the fungus. Fungicides can also be applied to protect healthy trees from infection.

See also

• List of apple diseases
• Plant pathology