COVID-19 UPDATE: Arborwell is Open and Performing Essential Tree Care Services at this time

Arborwell is Open for Essential Tree Services

COVID-19 UPDATE: Arborwell is Open and Performing Essential Tree Care Services at this time

Arborwell is Open for Essential Tree Services

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Threats to your Redwoods

Specific Redwood Issues

Phytophthora Root Rot

Phytophthora root rot is caused by a soil-borne organism. When first infected, the coast redwood’s foliage may wilt, yellow and dry out but remain on the tree. The leaf damage is because of the slow death of the redwood’s roots, which limit its ability to absorb adequate amounts of water. Eventually, the entire tree will turn brown and is unlikely to recover. If caught early enough, phytophthora root rot’s presence in the soil may be managed, or at least reduced, with the application of a fungicide containing potassium phosphate. But this is not always successful.

Armillaria Root Rot

Armillaria root rot rarely infects healthy coast redwoods. But stressed, under- or overwatered redwoods may fall prey to this disease. This soil-borne disease enters the plant through the roots, where it may be years before symptoms become noticeable. An infected coast redwood may slowly decline over a period of years, section by section. Or it may suddenly wilt and then die in a few weeks. To identify armillaria root rot, pull back the tree’s bark. Infected trees will have white or yellow fan-shaped mycelium growing between the bark and the wood. There is no cure for armillaria root rot. Infected trees should be uprooted and destroyed and the soil sterilized before another tree is planted in its place.

  • Phytophthora root rot is caused by a soil-borne organism.
  • When first infected, the coast redwood’s foliage may wilt, yellow and dry out but remain on the tree.
care for redwood trees

Botryosphaeria Canker

This fungus feeds on the cambium, sapwood and inner bark of weakened trees, forming large cankers. As these cankers grow, the fungus develops pimply black fruiting structures. The cankers will eventually girdle the branch, cutting of the nutrient supply to the leaves. To get rid of botryosphaeria canker, prune away the infected plant tissue.

Watering Issues

This is an important consideration as more and more sites are being watered with reclaimed water. The drawback to this water is the high salt content of most reclaimed water. At Arborwell, we can recommend ways to reduce the salt build-up from reclaimed water. This is important because too much salt will cause problems with many trees. If your site has reclaimed water, the advanced moisture sensors we use also measure salinity. This helps us watch and act to reduce the salt build up before it affects the trees.

Pests

Spider Mites – There are many species of spider mites, but their control is similar. The most important distinction between types is determining if you have warm season mites or cool season mites. This determines the timing of some of the treatments. There are a variety of ways to control mites, including ways to reduce populations naturally.  

Bark Beetles – Bark beetles in particular, lay their eggs inside the bark of trees. When the larvae hatch, they begin to feed on the living tissue just inside the bark layer. This slows or stops the transportation of water and nutrients up and down the tree. As they mature, they pupate into adults, exit the tree and look for more trees to attack. When enough bark beetle larvae are feeding on a particular tree, the tree can’t recover and dies. Sometimes the beetle will introduce a disease into the tree which either helps kill the tree, or increases the rate of wood decay, making it dangerous faster.

Tip Miners – While most massive redwoods scoff at the presence of pests, some pose more problems than others. Watch for signs like yellowed or browning leaves, which could indicate the presence of cypress tip miners.

Click the button at the top of the page to schedule an inspection today. Our ISA Certified Arborists can come up with a proactive plan to protect your Redwoods.

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Why is Soil pH Important?

One measurement we use in helping to determine overall soil health is soil pH. This is a common concept and important to understand, but is only one of many measurements we use to determine overall soil health. A good soil health recommendation will take many factors into consideration, but soil pH is the starting point, as it helps us determine nutrient availability, the tightness of soils, and the ability of soil biology to thrive or not. The wrong pH may encourage fungal pathogens, while the proper soil pH range will encourage good soil microbes.
The pH scale runs from 0 to 14. Any pH reading below 7 is acidic and any pH above 7 is alkaline. A pH of 7 indicates a neutral soil. Most trees will grow in soils having a pH between 6.5 (slightly acid) and 7.2 (slightly alkaline). Ideally, maintaining a soil close to 6.8 is perfect for most trees. There are a few plants that prefer a soil pH below 6.0. These “acid-loving” plants include azaleas, rhododendrons, and blueberries. The soil pH for these plants can be lowered by incorporating elemental sulfur (S) into the soil. Since the soil acidifying response to elemental sulfur is slow, it should be applied and incorporated a year before planting.

When soil pH is too high, many nutrients start to become unavailable to the tree. They may exist in the soil in adequate amounts, but are tied up and not available. One example of this is with pin oak a maple trees. When the pH is too high, they will show signs of iron or manganese deficiency, which is characterized by yellowish green foliage. Most of the time, iron and manganese are found in good supply in the soil, but are not soluble and thus not available. When this occurs, it is important to treat both the short-term problem of yellow foliage and the long-term problem of soil pH.

Soil microbes are also somewhat dependent on proper pH too. When the pH is too low or too high, certain pathogen fungi or bacteria will tend to proliferate. When the pH is in the proper range, the good guy microbes tend to thrive. These guys battle the pathogens and help prevent disease infections from the soil borne pathogens. Other factors besides pH determine how healthy the good soil microbes are, so those factors must be taken into consideration, too.

Soil “tightness” is a third factor that is affected by soil pH, at least indirectly. When the soil pH is too low, there is often a lack of calcium in the soil. When supplied in the adequate ratio compared to other minerals, the soil micro-pores will be more open, thus allowing more water and air space at the root level.
When a soil problem, such as pH, is suspected to be contributing to the problems with a tree or trees, a comprehensive soil test is always recommended. If you are concerned about this problem, ask your Arborwell Arborist for an evaluation and recommendations.

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Arbor-Wellness: Long Term Effects of Drought on Trees and Shrubs

Recurring periods of drought seem to have become commonplace in the Western US in recent years. The effects on trees and shrubs can often be seen in both natural and man-made landscapes during the severest of droughts as leaves wilt, show marginal scorch, or prematurely drop from the plant. However, the long-term effects of drought on the health and survivability of woody plants are less obvious.

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care for redwood trees

Challenges with Caring for Redwood Trees

Towering redwood trees make quite an impact and are beloved by residents and visitors alike. Robust and long-lived, these large trees suffer comparatively few issues, though they’re not problem-free. What are the challenges with caring for redwood trees on your San Diego, Sacramento, San Francisco, or Seattle property? Be on the lookout for these red flags.

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sudden oak death

What Causes Sudden Oak Death?

What causes Sudden Oak Death in trees and plant life? Sudden Oak Death, or SOD, is caused by the pathogenic fungus Phytophthora ramorum. This waterborne mold pathogen infiltrates plants and trees through contaminated irrigation water, wind-blown rain, infected plants, and contaminated pots and soil mixes. This fungus is also associated with other tree wellness issues like Ramorum leaf blight, Ramorum dieback, and Phytophthora canker.

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SavATree Merges with Arborwell Professional Tree Management

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Hayward, CA – January 13, 2020 – Arborwell Professional Tree Management, the west coast tree management experts, announced their merger with SavATree this week. SavATree, the industry leader in professional tree and shrub care, was founded in 1978 and has been providing outstanding tree & shrub care ever since. This merger will allow both companies to grow together through combined knowledge and resources.

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