How do you get rid of vinca fungus?
An effective treatment for water molds infesting vinca involves a soil drench using Daconil fungicide. Mix about 3 to 4 tablespoons of Daconil per 2.5 gallons of water in a watering can, and wet the top 3 to 4 inches of soil. Repeat the drenching the next day.
Why is my vinca dying?
Vincas, or periwinkles, can be infected with a fungal disease called aerial phytophthora. The disease spreads when the fungal spores in the soil are splashed on the plants when you water or when it rains. If rains or overwatering continues, the fungus can spread to the base of the plant and it can die.
How do you revive a dying vinca?
Sick Vinca in a growing bed
- Stop watering regularly.
- If you have a thick layer of mulch, remove it to let soil dry out faster.
- Increase drainage by aerating the soil: sink a steel bar or tomato stake a foot deep and pull it out.
- Remove infected plants.
Why are vinca leaves turning brown?
Fungal diseases, such as phtyophthora blight and leaf spot, are common among annual vinca plants. When soils are excessively wet, fungal spores are able to reproduce and infect plants. Infected plants first demonstrate signs of infection in the form of yellow to dark brown spots on leaves.
What is attacking my vinca?
University of California Statewide Integrated Pest Management Program also notes that scale insects, spider mites, weevils and whitefly can attack vinca, although these pests can be controlled by introducing beneficial predatory insects or broad-spectrum insecticides.
Why are my vincas turning yellow and dying?
Nutrients. Vincas with yellowing leaves are often reacting to a lack of iron, which is a common problem in alkaline soil. A lack of nitrogen in the soil can also cause yellowing leaves. Use of a fertilizer containing nitrogen, iron and sulfur helps to replace the nutrients while balancing the pH.
What’s wrong with my vinca?
Common fungal infections for annual vinca include botrytis blight, Alternaria leaf spot, root and stem rot and aerial phytophthora. With all of these fungal diseases, damp growing conditions or incorrectly watering plants is the culprit, as fungi grow in moist soil and infested plant debris.
How do you save vinca?
How to Gather Vinca Seed
- Allow a few vinca blooms to remain on the plant at the end of the blooming season.
- Cut the seeds pods from the vinca plant, or pinch them off with your fingernail.
- Place the sack in a warm, dry spot and leave them there for two to three weeks, or until the pods are completely dry.
How is neem oil used for plants?
Neem oil insecticide works as a systemic in many plants when applied as a soil drench. The compound causes insects to reduce or cease feeding, can prevent larvae from maturing, reduces or interrupts mating behavior and, in some cases, the oil coats the breathing holes of insects and kills them.
What do you do when vinca leaves turn yellow?
Why are my potted vincas turning yellow?
Periwinkles are very drought tolerant and are sensitive to being watered too often. Keeping the soil too moist makes their roots sick, and that leads to yellow plants, dropping leaves and even death. Do not put potting soil in the hole. You should do a good job preparing the whole bed prior to planting.