Boxwoods are commonly found in residential and commercial building landscapes found across the United States. The dense, evergreen shrubs are either isolated or in a hedge row planting, form a natural edge or visual barrier. Unfortunately, improper growing conditions cause, environmental factors and pests on the leaves fall and turn yellow. Care for the bushes to give them the ideal growing conditions they need to stay healthy.
Yellowing boxwood leaves are caused by a variety of pests, including aphids and boxwood leafminer. Spider mites are tiny sucking pests that SAP withered essential juices from the leaves of the host plant, which affected leaves turn yellow and appear. Large infestations of microscopic pests cause the leaves turn yellow and white cars with less. Treat spider mites with insecticidal soap or neem oil, and remove chickweed, wild mustard and blackberry plants growing near Boxwood, which usually hosts the pests. Symptoms of leaf miner infestation include water-soaked leaves on boxwood and blisters on the bottoms where larvae hide during the winter. Adult leafminers resemble white to pale-yellow maggots cause the yellowing leaves and stunt plant growth. Treat leafminer infestation with a registered fungicide.
Boxwoods benefit from fertilizer once a year, preferably in the spring before new growth develops on plants. To reduce the risk of injury fertilizer, apply the chosen formulation of the escarpment. The direct contact between the fertilizer and the branches of the leaves causes the foliage to die yellow, young roots and branches to rot on. Always follow. Label for fertilizer application rates, and precautions
Insufficient nitrogen causes the leaves to turn yellow the boxwood shrubs and appear stressed. Nitrogen deficiency is evident when the older foliage begins towards the lower side of the plant turn yellow altogether. The yellowing usually starts on the leaves inside the plant and fall out prematurely. New leaves grow smaller in size and turn bronze or brown during the winter. Take a soil test to confirm a lack of nutrients, and solve the problem with an application of high-nitrogen fertilizer 10-5-4.
Foliar diseases such as leaf spot and leaf burn cause the leaves to turn yellow the boxwood. The symptoms of leaf spot disease are yellowing of leaves with black fruiting bodies, yellowing caused leaf burn the tips of the leaves turn red and before he prematurely. Since leaves are susceptible to leaf spots weakened by winter injury, disease management by protecting the boxwood from wind and salt runoff. To leaf burn prevention, protection boxwood from drying winter winds.