How do you treat azalea leaf spots?
Fungicide sprays recommended for azaleas include copper hydroxide, copper-based fungicides, thiophanate-methyl or chlorothalonil. For Cercospora leaf spot on rhododendron use propiconazole, thiophanate-methyl, chlorothalonil or mancozeb.
What causes spots on azalea leaves?
On average, established azaleas require an inch (2.5 cm.) of rainfall or irrigation per week during their active growing season. Too much or too little light can also damage these plants. Leaf scorch, which is caused by too much sun, may appear as yellow or brown spots on foliage.
How is leaf spot disease treated?
For organic treatment, there are several safe and convenient treatments available. Most contain sulfur or copper octanate. Or you can try a more traditional treatment by spraying with a mild solution of bicarbonate of soda (baking soda), using ½ teaspoon per gallon (2.5 mL.
When Should I spray my azalea lace bug?
Azaleas should be sprayed when the first lace bugs appear. A second application in seven to ten days may be needed to control newly hatched lace bugs. Good control of the first generation in March to May will greatly reduce problems later in the season.
How do I know if my azalea is dying?
Azalea Dieback Diseases Symptoms include leaves that go from pale green to yellow to brown, prematurely falling leaves, and dieback. Unless the plant was exceptionally healthy before contracting the disease, you might find that your azalea bushes are dying within two or three weeks.
What does azalea lichen look like?
Azaleas and older trees of many species often have gray, flaky lichens growing on their limbs. Interestingly, a lichen is a “sandwich” made of algae in the center and fungus on the outside. The algae makes food from sunlight and air; the fungus protects the algae and supplies moisture.
Is lichen harmful to azaleas?
ANSWER: Lichens are producing the gray growths along the azalea stems. Each lichen is composed of an alga and fungus living together for mutual benefit. As you observed, they cause no plant damage. A heavy buildup of lichens may indicate a decline in plant vigor.
Can azaleas recover from lace bugs?
Best Treatment for Lace Bugs The trick is to monitor the plants (such as Azaleas or Olives) that regularly suffer from infestations of Lace Bugs. If you can find the infestation early, you may be able to pick off a couple of leaves, or prune off a few shoots, and remove the problem completely.
What kills lace bugs on azaleas?
For adult lace bugs, recommended spray insecticides include acephate, bifenthrin, lambda cyhalothrin, malathion, and cyfluthrin. Acephate may give the best control, as this insecticide is a foliar systemic that will move through the leaves to kill the lace bugs on the undersides of the leaves.