Garlic oil spray can kill aphids and other soft bodied pests. 3 answers . A: Wow, that is a lot of aphids! Aphids on Clematis armandii. Plants such as the following are attractive to aphids and good for organic aphid control. Reply. Grow plants for a homemade aphid control. A clematis growing on the same wall is a mass of bloom every year. A dusting of diatomaceous earth is lethal to aphids. Aphids Various greenfly and blackfly attack clematis, especially during spring and early summer. The first rule is to keep the plants healthy and vigorous. Aphids may feed on new growth early in the season. Reply. Answered. Heavy infestations can reduce the number and quality of blooms. Clematis are remarkably free from pests and diseases. Asked April 28, 2015, 12:03 AM EDT. Johnavallance82. on Apr 22, 2018. Please see Table 1 for fungicides labeled for powdery mildew control on clematis. Mites cause a fading of green leaf color, which makes the leaves look dusty or yellowed. These sapsucking insects are common in late spring/early summer and populations can explode if weather conditions are right. 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. I have a young clematis, only in the ground since last autumn and has just about reached 6' high. Clematis wilt can cause vines to suddenly collapse and die after their foliage and stems have blackened. The plant is growing on a long support with wisteria at the other end. 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. Q: I just realized that the new growth on my evergreen clematis is looking really bad. Aphids have attacked and I’m at a loss of what to do. Helpful. Pruning Care of Clematis. Their feeding may result in distorted growth. Mix 1 tablespoon of Castile soap to 1 gallon of water, spray. It also rinses off some of the honeydew. Wendy. on Apr 23, 2018. Yesterday I found little tiny black aphid-looking bugs on one of my clematis plants. 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. I thought HS would be a no-work kind of vine, but it’s just a big green mass (OK, but I would like the scent in my garden). Spray the plant every day until the plant is aphid free. This plant is growing on a communal roof-top garden in Portland. Compare clematis with roses for example and it quickly becomes clear that pound for pound, clematis come out winners every time! I have 5 goldflame honeysuckle plants growing in our backyard in NJ. Answer. 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. Aphids and spider mites can be a problem as well. 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