Spraying an insecticide once the weevils are present keeps populations in check. The females look like tiny dots, while the males have a pair of wings. They eat the foliage and bark of yews, causing a yellowish-brown color to appear. Applications of horticultural oils and insecticidal soaps directly on the location where scales and mealybugs are present will kill the insects. Largely disease-free, yew shrubs do suffer from phytophthora species that cause crown and root rot. When these damage the roots, the entire plant is sent in a downward spiral.
Branches begin dying, leaves often turn yellow, plant growth is stunted and death will ensue if the fungi are allowed to remain. The bark of the shrub may also appear discolored. Crown and root rot stem from overly moist soil conditions. Drainage is the key to preventing the diseases. Charles Missouri. I am not good at identifying shrubs, but from what I have learned I believe we just have common yews. The yews are planted at the front of our house which I believe is a northern exposure.
They are in front of a large porch on lightly elevated soil since our porch sits up above the natural grass line we had our basement ceiling elevated a couple feet. There have been strong winds rushing the front of our property, but I do not think there is any.
This could be related to a number of factors. If the bed is flat, the water can pool and create even more prolonged wet soil conditions. When yews are planted in a site that is too wet, they will lose vigor and gradually start to turn yellow. If the wet conditions persist, the yellow color will continue to deepen and then turn brown as the plants die. Even established yews can decline and eventually die if the site they are growing in starts getting too much water on a consistent basis, which happened to your yews this spring.
An extended period of unusually rainy weather can finish off a yew that has been slowly declining over a period of time because of overwatering or other stress factors like being planted too deep. If noticed soon enough, a yew that has been planted too deeply may recover if raised up and planted at the proper depth.
Since your yews are fully established and large, it may not be practical to try to raise them. If planted at the proper depth, you should be able to see the trunk flares — the area where the trunks widen out and transition to the root system at the soil surface level. Low branches emerging from the ground are a sign that a yew is planted too deep. There may not be much that you can do to help your yews other than being careful not to water them when you water any adjacent plants.
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