If you see brown, red, green or yellow eight-legged insects, your juniper has spider mites. Twigs and branches dying back could indicate juniper tip blight. To control prune out dead tips, making sure to go into the green part of the branch at least 2 inches. Clean pruning shears with 10 percent bleach solution or rubbing alcohol between cuts. Bad fungal infections can be controlled with copper spray. Junipers need air flow to avoid fungal disorders, so cleaning up around the shrubs and pruning out any dead wood is important.
It is also important to keep branches dry during warmer weather, so avoid overhead water or watering too often during the summer. If the drainage is poor, the plants may develop root rot, causing the whole or parts of the plant to die. Inspect your juniper branches for elongated off-white or gray bags of caterpillar larvae, indicating that your juniper has a bagworm infestation. Spray the caterpillars that emerged from the sacs with an insecticide containing the active ingredient bacillus thuringiensis.
The caterpillars often emerge from the sacs in late spring to summer. Spray the juniper every 10 days until the caterpillars are eradicated. Examine the twigs and branches of the juniper bush in early spring for brown twigs, dead twigs and twigs lying on the ground, signalling juniper tip blight infection.
Wipe the blades of your bypass pruners with 1 part isopropyl alcohol and 3 parts water. Prune back the infected twigs 2 inches into the live wood. I just noticed this; it seems to have happened overnight. The branches that are turning brown also have a grayish covering on them. What is wrong and what can I do? There are several things that can cause "junipers" to turn brown. You called them cedars, a commonly used name for our junipers, but from the picture you sent, they are junipers.
I have been observing this problem all over New Mexico as I have traveled doing programs. Your problem is spider mites, and it seems to be especially severe this year over much of New Mexico. I have seen it in the southern, eastern, and northern parts of our state. Spider mites are small almost microscopic creatures that feed on the sap of many of our plants. There is a type of spider mite that really loves our junipers often called cedars.
The fungus will continue to live in the soil even after the juniper is removed. Avoid planting new landscape plants that are susceptible to the disease in the same space.
Spruce spider mite infestations cause juniper needles to develop small yellow spots and some of them usually change to brown and fall from the shrub. There may also be a fine web between the leaves or branches. Severe infestations that go untreated for years can kill a juniper bush.
Spruce spider mites flourish in the spring and fall when the weather is cool. Confirm that the problem is spruce spider mites by holding a white piece of paper below a branch and tapping the branch. The tiny mites will be visible on the paper. If the mites are spruce spider mites, they will be green or brown. Beneficial mites that feed on spruce spider mites are red and move more quickly than the spruce mites.
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