Antrodiella

Antrodiella (Antrodiella) is a genus of wood-decay fungi that causes significant structural damage to trees by inducing white rot. These fungi act as opportunistic pathogens that thrive on weakened or wounded wood, secreting enzymes that degrade lignin and cellulose. This process compromises the integrity of the tree's vascular system and structural strength over time.

Target hosts primarily include a wide variety of deciduous trees, with apple and pear orchards being particularly susceptible. The fungus typically initiates infection through pruning cuts, bark cracks, frost damage, or other mechanical injuries that leave the cambium and inner wood exposed to spores circulating in the air.

The primary clinical sign of infestation is the emergence of small, leathery, or crust-like fruiting bodies on the bark surface, usually appearing in white, cream, or pale yellow hues. As the infection progresses internally, the affected wood becomes soft, discolored, and light in texture, often leading to increased branch breakage or the sudden collapse of the entire tree during windy conditions.

The development of this disease is highly favored by humid environments and suboptimal growing conditions. Once established, the mycelium spreads systemically throughout the host tissue. Spore dispersal is most active during periods of moderate temperatures and high precipitation, allowing the fungus to colonize nearby susceptible host tissues or spread through contact with contaminated tools.

Management and prevention focus on limiting the entry points for the pathogen:

• practicing strict sanitation by disinfecting pruning tools between trees;
• applying protective wound paints or sealants to large cuts and broken limbs;
• removing and incinerating infected wood debris to reduce spore load;
• promoting tree vigor through proper fertilization and irrigation to strengthen natural defenses.