To protect themselves from competition, black walnut trees exude a toxin called juglone. Gardens planted near black walnut trees or roostocks frequently fail to thrive due to this toxin. Many plants can be affected, but tomatoes and potatoes show the greatest susceptibility.
Verticillium wilt is caused by six different species of fungus, all of the genus Verticillium. These six fungi can attack most of the plants and trees that gardeners like to grow, including vegetables, fruits, and ornamental plants.
Although its most common victims are from the nightshade family, tobacco mosaic virus can infect a surprising array of garden plants.
Powdery mildew is caused by one of the most common and widely distributed fungi that plague gardens. The disease can attack a wide range of plants, as it is caused by several species of the order Erysiphales. A sampling of commonly affected plants includes: Cucumbers. Pumpkins. Squash. Melons. Grapes. Phlox. Peonies. Lilacs. Bluegrass. Fescue. TheContinue reading “Powdery Mildew”
Now that we know what brix is and how to measure it, we’re ready to find ways to apply this knowledge.
Pierce’s disease (PD) is a bacterial disease of grapes named for Newton Pierce, who described the disease in 1892. The bacterium species is Xylella fastidiosa.
The reading displayed on the refractometer is actually not a true measurement of the sugar dissolved in the substance being tested.
Phytophthora blight, also known as late blight, is a fungal disease caused by several species of the genus Phytophthora. Affected plants include: Cucumbers. Squash. Pumpkins. Cantaloupe. Watermelons. Tomatoes. Eggplants. Peppers. Potatoes. Beans. The fungi involved flourish in wet, moderately warm weather. They spend the winter in infected tubers and plant matter. The disease is spreadContinue reading “Phytophthora Blight”
Brix is one of those topics that come up fairly frequently in sustainable agriculture. Simply put, brix is a measure of the sugar content of a plant or other substance. To be more specific, Brix expresses the weight of dissolved sugar as a percentage of the weight of the entire solution. Pure water has aContinue reading “Brix: What is It?”
Peach leaf curl is a common disease caused by the fungus Taphrina deformans. Besides peaches, susceptible plants include nectarines and almonds. The peach leaf curl fungus spends the winter in the bark and buds of its hosts. It enters new buds as they begin to swell and open in the spring, spread by rain andContinue reading “Peach Leaf Curl”