Heavy infestations can reduce the number and quality of blooms. Clematis wilt can cause vines to suddenly collapse and die after their foliage and stems have blackened. Q: I just realized that the new growth on my evergreen clematis is looking really bad. Clematis wilt can attack any type of clematis. Mix 1 tablespoon of Castile soap to 1 gallon of water, spray. The plant is growing on a long support with wisteria at the other end. 3 answers . A: Wow, that is a lot of aphids! It also rinses off some of the honeydew. 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. Heavy infestations at the shoot tips can stunt growth and soil foliage with a … A clematis growing on the same wall is a mass of bloom every year. Plants such as the following are attractive to aphids and good for organic aphid control. Reply. Hi everyone, I appreciate any advice you can give me. on Apr 22, 2018. I have a young clematis, only in the ground since last autumn and has just about reached 6' high. 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. Reply. Please see Table 1 for fungicides labeled for powdery mildew control on clematis. Aphids and spider mites can be a problem as well. I have 5 goldflame honeysuckle plants growing in our backyard in NJ. Helpful. Aphids on Clematis armandii. Annual pruning may also be required to keep clematis plants looking their best. 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. It has not been pruned this year after flowering, and the aphids are very thick on all the leaves. 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). These sapsucking insects are common in late spring/early summer and populations can explode if weather conditions are right. on Apr 23, 2018. Garlic oil spray can kill aphids and other soft bodied pests. Wendy. 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. Yesterday I found little tiny black aphid-looking bugs on one of my clematis plants. Pruning Care of Clematis. Asked April 28, 2015, 12:03 AM EDT. Grow plants for a homemade aphid control. The first rule is to keep the plants healthy and vigorous. Their feeding may result in distorted growth. Answer. Powdery mildew often affects plants with poor air circulation. Clematis are remarkably free from pests and diseases. This plant is growing on a communal roof-top garden in Portland. Johnavallance82. Answered. Spray the plant every day until the plant is aphid free. 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