4.Life Cycle 1)Brown planthopper *Every year this insect comes from the southern end of the Asian continent to China. During spring and summer,has 5 migrations from southern to northern China on warm and moist airflow currents. 1) Brown 1) Brown planthopper planthopper ™ Every year this insect comes from the Every year this insect comes from the southern end of the Asian continent to China. southern end of the Asian continent to China. ™ During spring and summer, has 5 During spring and summer, has 5 migrations from southern to northern China migrations from southern to northern China on warm and moist airflow currents. on warm and moist airflow currents. 4. Life Cycle 4. Life Cycle