Anisandrus maiche

Anisandrus maiche is a dangerous invasive pest belonging to the order Coleoptera and the family Curculionidae (subfamily Scolytinae). This species has become widely recognized as a specialized pest of deciduous trees, including valuable fruit species, which makes it a major concern for professional arboriculture and modern forestry management.

The range of host plants includes a wide variety of tree species. The beetle most frequently attacks fruit crops such as apple, pear, plum, and cherry trees, as well as ornamental and forest species like maple, oak, and walnut. The pest’s damage is linked to a unique feeding habit: the beetles introduce symbiotic fungi into the wood, which colonize the galleries and serve as the primary food source for the developing larvae.

The biology and life cycle of this species are defined by its cryptic subterranean behavior. Females bore into the bark and sapwood to create gallery systems, where they deposit their eggs. Once the larvae emerge, they continue to expand the tunnels, facilitating the spread of the fungal mats within the tree. Depending on local climate and available host material, the species may produce one or several generations within a single season.

Damage symptoms include wilting of branches, premature leaf drop, and a general decline in tree vitality. Sap exudation at the entry holes is common, and heavy infestations can leave the tree vulnerable to secondary pathogens. The economic impact is significant because the fungal colonies effectively block water and nutrient transport, leading to the potential death of the tree after repeated seasons of infestation.

Protection strategies are focused on early detection and the mitigation of population growth. The core recommendations include:

• Implementing regular sanitary surveys of plantations to identify new entry holes.
• Prompt removal and destruction (burning) of infested branches or entire trees to eliminate breeding centers.
• Maintaining high tree vigor through proper irrigation, fertilization, and site management.
• Application of systemic insecticides during the peak periods of adult beetle flight.
• Utilizing pheromone traps for monitoring population density and disrupting mating cycles.