Aphids are the bane of most avid gardeners existence. Be warned, they do come in different colours. Aphids can be various shade of greeney-yellow, green to darder shades of black. In large numbers they can suck the life out of plants (if the plant is still very small, they can kill it), look unsightly, stunt plant growth, weaken the plant to other diseases (sooty mould, etc) and encourage ants. Soapy water is said to be an eco friendly way of getting rid of the pests, but alas it does require alot of repeat applications and when your infestation is as bad as the lemon tree in the picture, then chemical control is usually necessary. I recommend Eco Oil mixed with Eco Rose. They are the most environmentally friendly control Ive found and the best bit is it I havent found it to kill Lady Birds! I love Lady Bird Beetles. They make me smile and they decimate aphids. I have heard you can buy Lady Birds to release into your plants, but I have never come across this in a domestic situation.
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