Pear psyllid

Cacopsylla propinqua is a specialized insect pest belonging to the Psyllidae family. This species is known for causing economic damage in pear orchards by feeding on the sap of young tissues, which stunts tree growth and reduces fruit quality.

The pest primarily infests pear trees (genus Pyrus). It colonizes young shoots, leaf undersides, and flower stalks. The continuous sap extraction by nymphs and adults stresses the plant, leading to stunted shoot growth and a significant reduction in photosynthetic capacity.

The life cycle involves overwintering as adults, which emerge in early spring to deposit eggs on developing buds. Multiple generations can occur within a single growing season. This overlapping of generations often makes chemical control challenging, as the population consists of different life stages at the same time.

The damage is characterized by leaf curling, chlorosis, and the production of honeydew. This sticky substance covers leaves and fruits, serving as a substrate for sooty mold fungi. The resulting black coating blocks sunlight and drastically reduces the commercial value of the harvested pears.

Management strategies require a multi-faceted approach to keep populations below the economic injury level. Key practices include:

• Regular orchard scouting to monitor pest density.
• Timely application of targeted insecticides during the most susceptible nymph stages.
• Orchard sanitation, including pruning of water sprouts and infested tips.
• Enhancement of natural enemy habitats, such as lady beetles and lacewings.
• Use of winter oils to reduce the survival rate of overwintering adults.