![]() ![]() Leaf tips and margins turn yellow and redden as leaves fall prematurely. Apply a fungicide in a manner that achieves thorough coverage of the top and bottom of leaves and twigs. Thin boxwoods to obtain good air circulation among the branches. The sticky spores of the pathogen are readily spread from plant to plant on tools and contaminated clothing and gloves. Do not try to compost leaves from infected plants. Remove and destroy severely affected plants. Long distance spread of the pathogen is through the movement of infected nursery material. insularis (Korean boxwood), B colchica and Pachysandra are susceptible. microphylla (littleleaf boxwood) and var. Formerly known as Cylindrocladium buxicola)īuxus sempervirens, B. Neonectria pseudonaviculatum (asexual stage, Cylindrocladium pseudonavitulatum. Under wet conditions, white fungal growth is observed on the leaves and twig lesions. Leaves may turn straw-yellow or bronze and fall. Leaves on the lower part of the shrub have brown spots. Remove dead leaves accumulated among the branches. Prune dead branches well below cankered areas. Protect plants from winter injury and other stresses. The wood under the sunken canker is blackened.Īttack by various fungi and nematodes adds to damage from winter injury and stress on plants, especially those in poorly drained sites. Sunken cankers form at the soil line or on branches in the crotches where dead leaves accumulate. Young foliage turns grayish green or bronze and finally straw-colored. Fungicides protect new foliage only. Also, check the drainage in the area and make sure the soil drains well.Stunted growth and dieback occur. It is up to you if you want to spray a fungicide. Thin out and rake affected plants and debris. ![]() It would have been good to do this earlier in the spring but you can do it now. If you have large infected areas, you can mow at the highest setting. will also help reduce the amount of moisture trapped and will promote faster drying of the planting bed. Removal of affected plant material, fallen debris, and clean up of old leaves etc. If you just have small areas of affected plants, rip out and thin the plants. Pachysandra - See our web page below for photos and more information on managing the beds culturally. You can submit photos so we can see what you may be dealing with. The iris may be exhibiting symptoms of iris borer, an insect issue getting started or a leaf spot. Most likely the yellow leaves on the holly trees are older foliage which is normally shed in the spring. This does not affect other trees and plants. This looks like volutella blight, a fungal disease. In one of the back flower beds we have seen signs similar to volutella on iris leaves as these came up and before flowering.
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