Biology and Demographic Statistics of Agonoscena pistaciae (Hemiptera: Psyllidae) on Different Pistachio Cultivars

Abstract

The pistachio psyllid, Agonoscena pistaciae, is a key sap-sucking pest affecting pistachio production, with significant variation in its biology and population dynamics across different cultivars. The present study investigates the biology and demographic statistics of A. pistaciae on selected pistachio cultivars under controlled laboratory conditions. Developmental duration, survival rate, fecundity, and longevity were recorded across life stages on different host cultivars, and life table parameters were analyzed to assess population performance. Results revealed significant differences in biological performance of A. pistaciae among cultivars, indicating strong host-mediated effects on pest development. Certain cultivars supported faster development, higher survival rates, and increased fecundity, suggesting higher susceptibility to psyllid infestation. In contrast, resistant cultivars exhibited prolonged developmental time, reduced nymphal survival, and lower reproductive output. Demographic parameters such as net reproductive rate (R₀), intrinsic rate of increase (r), finite rate of increase (λ), and mean generation time (T) varied significantly across cultivars, reflecting differential host suitability. Age-specific survival and fecundity curves further demonstrated reduced population growth potential on resistant cultivars. The study highlights that host plant genotype plays a critical role in shaping the population dynamics of A. pistaciae. These findings suggest that selection of resistant pistachio cultivars can effectively suppress psyllid population growth and reduce pest pressure in orchards. Overall, the integration of biological and demographic analyses provides valuable insights into host–pest interactions and supports the development of cultivar-based management strategies for sustainable control of A. pistaciae in pistachio agroecosystems.