Channel: DISEASE, PEST AND WEED CONTROL http://journals.caass.org.cn/mhxb EN-US http://journals.caass.org.cn/mhxb/EN/current.shtml http://journals.caass.org.cn/mhxb 5 Lygus pratensis in cotton field, so as to provide a theoretical basis for the ecological control of L. pratensis. [Method] A total of 20 cotton fields in Aral Reclamation Area of Xinjiang were selected as experimental sites from 2019 to 2021. The methods of net trapping and sex attracter combined with yellow plate trapping were used to investigate the population dynamics of L. pratensis adults, and the land use status around the cotton field within a radius of 2 000 m was also investigated. A linear mixed model was fitted to the landscape parameters of farmland landscape patterns at 500 m, 1 000 m, 1 500 m and 2 000 m scales and the population number of the L. pratensis adults of the second- and third-generation. [Result] L. pratensis had 4 generations in Aral Reclamation Area every year, and the second and third generations were the main populations in cotton fields. At the four scales, host crop habitat (Host) accounted for the highest area (64.14%-69.85%), followed by single crop (Cotton) habitat (51.21%-55.26%), while the area ratio of forest belt and desolate sands habitat (FBDS), shrub habitat (Shrub), building land habitat (Building), other crop habitat (Other crops) and water habitat (Water) were relatively low. The results of model fitting showed that the control effect of landscape variables on the population number of the second-generation adults in the cotton field gradually weakened with the increase of the scale. There were extremely significant or significant positive correlation between the population number of the second-generation adults and the area ratio of Building (500 m scale) and FBDS (1 500 m scale), and a strong and extremely significant negative correlation between the population number of the second-generation adults and the area ratio of Host (1 000 m scale). There was a strong and extremely significant positive correlation between the population number of the third-generation adults of L. pratensis and the area ratio of Building (500 m scale). The population number of the third-generation adults was negatively correlated with the area ratio of Host (1 000 m), Other crops (1 000 m, P < 0.01) and Water (1 000 km, P < 0.05), and positively correlated with the perimeter area ratio (1 500 m, P < 0.05; 2 000 m, P < 0.01). [Conclusion] The farmland landscape pattern had an obvious regulatory effect on the population number of L. pratensis adults in cotton field. The increase of the area ratio of Host, Other crops and Water in farmland landscape had a certain control effect on the population number of L. pratensis in cotton field. The increase of the area ratio of FBDS and Building promoted the occurrence of L. pratensis in cotton fields.]]>