Adaptability of small brown planthopper to four rice cultivars using life table and population projection method

Abstract

In this study, we evaluated the adaptability of the small brown planthopper (SBPH), Laodelphax striatellus (Hemiptera: Delphacidae) to four rice cultivars including Shengdao13 (SD13), Shengdao14 (SD14), Shengdao15 (SD15), and Zixiangnuo (ZXN) using the age-stage, two-sex life table with a simplified method for recording egg production (i.e., every five days vs. daily). The intrinsic rate of increase ( r) of the SBPH was the highest (0.1067 d ⁻¹) on cultivar SD15, which was similar to the rate on SD14 (0.1029 d ⁻¹), but was significantly higher than that occurring on ZXN (0.0897 d ⁻¹) and SD13 (0.0802 d ⁻¹). The differences of the finite rate of increase ( λ) on the four rice cultivars were consistent with the r values. Population projection predicted an explosive population growth of the SBPH occurring in a relatively short time when reared on SD14 and SD15. These findings demonstrated that the SBPH can successfully survive on the four rice cultivars, although there were varying host adaptabilities.