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How to kill aphids on roses?

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Aphids are big nitrogen feeders, thus another way to help control aphids on roses is to use slow or time- release (urea based) nitrogen fertilizers. Caring for roses with aphids like this means there is not a big push of nitrogen to the plants or bushes right after feeding them, which the aphids find most attractive for their reproduction. read more

After an hour has passed, spray the roses with a garden hose to remove any soap residue and the dead aphids. Insecticidal soap will only kill the aphids upon contact and may require multiple applications, but they do not leave a toxic residue on the roses and will not harm the local wildlife. read more

Spot the aphids. Aphid damage is recognisable by telltale signs of cottony-looking threads around new buds and leaves. Some aphids prefer older growth. Aphids are also known as "plant lice" and they hang around in bunches, making them easy to spot. read more

In light cases, aphids on roses can be picked off by hand and squished or sometimes a quick tapping of the bloom or foliage will knock them to the ground. Once on the ground, they will be easier prey for the garden good guy insects. read more

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Further Research

Aphids On Rose Bushes
www.gardeningknowhow.com

Homemade Aphid Control
www.gardeningknowhow.com

How to Get Rid of Aphids
www.planetnatural.com

Natural Control of Aphids on Roses
homeguides.sfgate.com