Bottom-up and top-down control of pear psylla ( Cacopsylla pyricola): Fertilization, plant quality, and the efficacy of the predator Anthocoris nemoralis

Herbivore population dynamics are governed both by bottom-up (plant-mediated) and by top-down (natural enemy-mediated) processes, with the potential for interaction between them. Pear psylla ( Cacopsylla pyricola Foërster) is a phytophagous pest in pear orchards. Pear psylla is commonly attacked by...

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