The leaves start to dry out and curl over at the tips and edges some look like they have chlorosis. some of the branch tips will also wilt over and die also. I live in northern NSW near the coast we have a warm to moderate climate here with temps of about 7-25c winter and 14-30c in summer with high rainfall mainly in summer. I have other older azaleas they are quite large in pots that are fine but the ones that are sick are in smaller pots I feed them granulated azalea food and fish emulsion every few weeks. I did re-pot them about 2 months ago and I thought it may be a ph acid problem as I know they can be sensitive to changes in soil etc. ? How often should I feed them ? Can you tell me if they have a disease or something else ? Would much appreciate your input...Thanks.
02 December 2013 12:34 AM
There are a number of pests that can attack azaleas, one such pest being azalea leafminer. The eggs of this pest are laid near the midrib of the leaf of the azalea. The caterpillars then feed between the leaf surfaces near the midrib. Gradually brown patches or blisters appear causing a brown wedge-shape patch about 5 mm long on the leaf. The best way of controlling this pest is to remove the damaged leaves early in spring and dispose of them in a plastic bag put in the rubbish bin. From looking at the photos, the leaves also show signs of nutrient deficiency. It might be wise to check the pH of the soil first and make sure it is around a reading of way 5. Azaleas like to grow in acidic soils. If the soil is on the alkaline side, they will show signs of deficiency. To help lower your pH, try Yates Soil Acidifier Liquid Sulfur. It helps creates ideal growing conditions for acid loving plants such as camellias, azaleas, magnolias and blueberries. It's an easy-to-use liquid formulation, it can be diluted and applied without the dust and the mess associated with traditional granular products. Azalea Lace Bug is another pest you should be aware of when caring for your azaleas. This pest is active from spring to autumn and can do considerable damage to the foliage if not controlled early in the season. This pest can be controlled by applying a product called Yates Baythroid, Lawn Grub and Insecticide. It sontrols a wide range of insect pests of lawns, ornamentals, vegetables and outdoor areas.