The Fungus among Us

August 26th 2010

Danger, danger, there is a humongous fungus among us. Just kidding, but we have been getting more and more reports of various types of fungi and blights from our customers lately. Thanks to the heat and wet weather we have been experiencing, different fungi and blights have been given prime growing conditions. We have seen many different problems including tomato blight, apple scab, and powdery mildew.


Some of the fungal problems that you may be experiencing in your garden have no real “cure” at this time during the growing season. You can stop the fungi from spreading, but you are not going to be able to fix what damage has been done.

A good example is apple scab, a common fungus found on apple and crab apple trees. The best time to treat this disease is in spring, just before the tree buds, by using a dormant oil or liquid sulfur spray. This is when fruit trees are most susceptible to primary infection. After the tree has blossomed apply a systemic fungicide. If your tree continues to be infected, applying a regiment of dormant oil in fall, and again in the spring in combination with a systemic fungicide may help clear the problem up. This regiment may have to be followed for a couple of years to completely treat the disease. Note that systemic fungicides are to be used on ornamental plants, using a systemic fungicide on fruit bearing trees may lead to human consumption which may be harmful. On fruit bearing trees consider using a natural product such as neem oil for similar results.

Blossom end rot on tomatoes is another problem many customers have been experiencing this growing season. The application of a yield booster before the plant begins to fruit is often the most effective solution. Another good prevention technique is to whenever possible keep the foliage dry and have enough room between plantings to promote good air circulation.

Powdery mildew is also very common problem this year. This white powdery fungus is most effectively handled by applying a copper liquid soap. With proper application copper soap will control this disease quite effectively. If at all possible it is best to be proactive next year and treat your affected plants by applying three applications of copper soap before you notice signs of powdery mildew next season.

When applying any fungicides in the garden read all application directions thoroughly, certain fungicides may cause damage to your plants if it is over 80 degrees Fahrenheit, also many fungicides are not intended for human consumption. If you have any questions or problems not mentioned today please come on down to the shop where any of our experienced sales staff will help you find a solution to what ales your garden. Don’t forget to bring fresh samples and pictures if possible for an accurate diagnosis.