Aphids were the least of my problems this year, but I did get them, I used the following treatments insecticide soap spray that i bought it worked for awhile and I had less of them to deal with when i noticed that they were making a come back I dusted with D.E. and pepper powder which helped after that I used Neem oil in a spray mix. That seemed to do the most good , but by that time i had spidermites and spaying with any water base mixes started to cause mildew because of the high humidity, so now I had mildew, spidermites and aphids and stink bugs along with pepper maggots which not only attacked my sweet peppers but hit my eggplants, tomatoes and some of my tomatillo plants , So I went crazy and spraid everthing with liquid seven mixed with liquid lime and sulfur, end of problems. So I guess something worked.