Spatial distribution pattern of Frankliniella occidentalis during pepper flowering stage in Ningxia.
Objective: Invasive species western flower thrips (Frankliniella occidentalis) is one kind of vital pests to greenhouse vegetables in Ningxia. This study investigated the spatial distribution pattern of Frankliniella occidentalis during pepper flowering stage in Ningxia to provide basis for understanding the occurrence, harm and diffusion behavior, monitoring and integrated control of Frankliniella occidentalis. Method: The spatial distribution pattern of F. occidentalis on greenhouse pepper flowers in Ningxia was studied using fitness chi-square fitting, aggregation indexes and linear regression equation tests. Result: The frequency distribution indicated that the population density of Frankliniella occidentalis on greenhouse pepper flowers was 0 to 7 each flower, with the highest frequencies of 0 and 1 per flower. The frequency declined significantly with the increase of population density. The spatial distribution pattern of F. occidentalis followed the negative binomial distribution and Neyman pattern and further analysis showed that they followed the Neyman pattern better. The aggregation indexes test indicated aggregative distribution caused by environmental heterogeneity. Conclusion: This study clarified the spatial distribution pattern of F. occidentalis on greenhouse pepper flowers in Ningxia, which provides basis for developing effective control technology.