Mix 1 tablespoon of Castile soap to 1 gallon of water, spray. Powdery mildew often affects plants with poor air circulation. What can I put on clematis to rid of aphids? Answer. The two species are easy to tell apart from their antennae, with Myzus varians having conspicuously banded antennae and Aphis vitalbae having only antennal segment VI darkened. Pruning Care of Clematis. Reply. Aphids and spider mites can be a problem as well. I have 5 goldflame honeysuckle plants growing in our backyard in NJ. Please see Table 1 for fungicides labeled for powdery mildew control on clematis. Clematis wilt can attack any type of clematis. Clematis wilt can cause vines to suddenly collapse and die after their foliage and stems have blackened. Compare clematis with roses for example and it quickly becomes clear that pound for pound, clematis come out winners every time! I have a young clematis, only in the ground since last autumn and has just about reached 6' high. Yesterday I found little tiny black aphid-looking bugs on one of my clematis plants. Annual pruning may also be required to keep clematis plants looking their best. Reply. It also rinses off some of the honeydew. Maarigard / Getty Images Plants Susceptible to Clematis Wilt . Clematis are remarkably free from pests and diseases. This was the peach-clematis aphid (Myzus varians, see picture below). Wendy. Johnavallance82. Aphids have attacked and I’m at a loss of what to do. Grow plants for a homemade aphid control. Heavy infestations at the shoot tips can stunt growth and soil foliage with a … I've nipped out a few ends to help it bush out and it's looking good but all the new growth has a thick covering of black aphids being carefully tended by ants. Answered. Hi everyone, I appreciate any advice you can give me. Their feeding may result in distorted growth. 3 answers . Spray the plant every day until the plant is aphid free. Aphids Various greenfly and blackfly attack clematis, especially during spring and early summer. Asked April 28, 2015, 12:03 AM EDT. It has not been pruned this year after flowering, and the aphids are very thick on all the leaves. A strong spray of water from a hose will knock many of the aphids off the plant, and they won’t be able to return. Garlic oil spray can kill aphids and other soft bodied pests. I used an insecticide on it (I've used this on the rose bushes before), but now I'm wondering if that was a mistake. A clematis growing on the same wall is a mass of bloom every year. The plant is growing on a long support with wisteria at the other end. A: Wow, that is a lot of aphids! A dusting of diatomaceous earth is lethal to aphids. These sapsucking insects are common in late spring/early summer and populations can explode if weather conditions are right. Aphids may feed on new growth early in the season. 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