Tea corticium

The fungus primarily colonizes the aerial parts of the tea plant. Its mycelium grows across the surface of leaves and stems, forming distinct web-like or crusty patches that eventually lead to tissue necrosis.

Dissemination of the pathogen occurs through basidiospores carried by wind and splashing water. These spores serve as the primary source of infection in new areas within the plantation.

The fungus can persist in a dormant state on infected twigs and crop debris, remaining viable until favorable environmental conditions allow for renewed sporulation.

Understanding the life cycle of Corticium theae is vital for implementing early-stage interventions, as the pathogen's ability to survive in plant residues makes eradication challenging.

Initial symptoms manifest as small, irregular brown spots on the leaves. These spots gradually expand and coalesce, eventually causing the entire leaf to wither and detach from the branch.

On the stems, the fungus produces a characteristic brown or greyish felt-like mat. This mycelial cover can grow thick and dense, wrapping around the branch and obstructing normal vascular flow.

The infected bark often cracks and develops lesions. If the infection reaches the cambium, the branch will lose its structural integrity and die back from the tip towards the base of the plant.

Severe infestations give the tea bushes a scorched appearance, significantly reducing the amount of harvestable foliage and affecting the general health of the plant canopy.

• Dark brown lesions on leaf surfaces.
• Felt-like mycelial mats on stems and twigs.
• Bark cracking and deep necrotic ulcers.
• Dieback of shoots starting from the tips.

High relative humidity, typically exceeding 80%, is the primary environmental driver for Corticium theae. Persistent rainfall and foggy weather accelerate the rapid development of the fungus.

The pathogen thrives in moderate temperature ranges, typically between 20°C and 25°C. These conditions allow for the rapid colonization of host tissues by the fungal hyphae.

Poor aeration within the tea garden, often caused by overcrowding or lack of proper pruning, significantly increases the risk of the disease reaching epidemic proportions.

Plants that are nutrient-deficient or suffering from environmental stress are more susceptible to colonization, as their natural immune barriers are weakened.

The presence of dense weed growth under the tea bushes prevents air circulation and maintains high humidity levels around the lower stems, facilitating the spread of the pathogen.

The disease causes substantial damage by reducing the yield of quality tea leaves. Infected leaves become unsuitable for processing, resulting in significant economic losses.

Widespread dieback of shoots hampers the growth of the tea bush, leading to a reduced canopy and decreased potential for future harvests over several growing seasons.

In severe cases, the fungus can cause the death of the entire plant. Replacing infected bushes requires significant time, labor, and capital investment.

The overall degradation of the plantation's health lowers the commercial value of the crop, as the remaining healthy leaves may also be of inferior quality due to the plant's metabolic stress.

Additional costs associated with fungicides, intensive pruning, and constant monitoring represent a heavy financial burden for tea producers operating in affected regions.

Strict sanitation through the removal and burning of infected branches is the most effective way to limit the spread of the fungus within a plantation.

Implementing a proper pruning schedule helps maintain optimal plant spacing and improves air circulation, which reduces the humidity levels that the fungus requires to thrive.

Copper-based fungicides are standard in the management of tea corticium, providing a protective barrier on the leaves and stems against fungal spore germination.

Ensuring balanced fertilization helps maintain the plant's vigor and natural resistance against secondary fungal attacks, supporting long-term health.

Effective weed management is necessary to keep the base of the tea bushes clear and dry, thus preventing the formation of microclimates that favor the pathogen's growth.