I have a question, I have seen these aphids on alot of my plants, and most people say use a quick squirt of the hose, or insecticidal soap, but sometimes there seems to be zillions. ( ok maybe a few hundred) My question where do they come from, the soil. I have plants on my patio that is screened and I had cucumbers growing up a trellis they looked great, then out of nowhere every leave was covered with them. I tried washing them off gently with a hose, they were back the next day and I cleaned every leaf that had them on it. Then I move the plant out of the sun and used the soap hoping it would help, it made the leave all yellow and crispy even with it not being in the sun. Now the plant looks horrible and extremely stressed, and they are returning in small doses. I am trying to figure the source and stop them before they arrive. Are they in the soil, the air, I need to go to the library and get more info as they are worse then ever. They are so small and it is hard to see if they just fall to the ground when you spray and then crawl, fly or whatever to get back on - I know it sounds stupid but its like they just appear out of nowhere.
Thanks for any info. I hate aphids.