espèce (1) surveillance (1) Monitoring (1) Case (1) Yellow (1) Water (1) Species (1) Seasons (1) Regression analysis (1) Population (1) Plants (1) Potato aphid (1) Green peach aphid (1) Grammar, Comparative and general--Case (1) Emigration and immigration (1) Case (1) Aphids (1) Population (1) Number (1) Emigration and immigration (1)