Fig. 2

The changes in the number of cotton bollworms and the ratios of damaged cotton stem-tips, buds, and bolls. a to c Changes in the number of cotton bollworms found at the second, third and fourth cotton bollworm generation stages from 2008 to 2015; d to f The ratios of damaged cotton stem-tips, buds, and bolls from 2008 to 2015. The error bars are SEs