Statistical evidences is presented to show a teleconnection between population density (egg counts) of cotton bollworm (CBW), Helicoverpa armigera Hübner, and ENSO indices during the previous 2.5 years (from January of two years before to the current July). The ENSO indices used were the Southern Oscillation Index (SOI) and the Sea Surface Temperature (SST) anomalies in the five El Nio regions: Nio1&2 region (N12, 0～10°S,90～80°W), Nio3 region (N3, 5°N～5°S,150°～90°W ), Nio4 region (N4, 5°N～5°S, 160°E～15...