Dewy jewel beetle

Systematic position: The dewy jewel beetle (Agrilus roscidus) belongs to the order Coleoptera and the family Buprestidae. These beetles are notorious wood-borers that pose a persistent threat to woody vegetation by infiltrating the cambium layer beneath the bark.

Host plants: This pest primarily targets trees within the Rosaceae family. It is particularly damaging to stone fruit species, including apricot, plum, cherry, and other cultivated orchards. It can also be found on wild shrubby forms of these trees located near gardens or forest edges.

Biology and life cycle: The beetle goes through a complete metamorphosis, including egg, larva, pupa, and adult stages. Adult beetles typically emerge during the summer months, feeding on foliage before mating. The female then deposits eggs on the bark. Upon hatching, the larvae tunnel into the host tree, where they live and feed, often spending one or two years in the larval stage before pupating.

Damage and economic impact: The primary harm is caused by larval boring, which creates galleries under the bark. This disrupts the tree's vascular system, hindering the transport of water and nutrients. Infected trees often exhibit symptoms such as wilted foliage, branch dieback, and cracks in the bark. High infestation levels can lead to the death of the entire tree, causing significant economic losses in orchards.

• Sanitary pruning: systematically remove and destroy branches showing signs of infestation.
• Maintain tree vigor through proper irrigation and fertilization to improve natural defenses.
• Apply targeted insecticides during the adult beetle flight period to prevent egg-laying.
• Keep the orchard clear of dead or severely stressed trees that could serve as breeding grounds.
• Regularly inspect the bark for exit holes and signs of larval activity.