Azalea lace bugs are rather small insects, but their feeding habits leave telltale signs on the foliage. The leaves will have a whitish cast to them. Close examination will reveal very fine specks on the upper leaf surface where the green pigment, chlorophyll, is absent. If you look on the underside of the leaves, you will see tiny tar‑like spots of excrement. High populations of lace bugs are more prevalent on plants located in full sun.
Adult lace bugs are less than one‑quarter of an inch long. They have a black body and clear wings with darker markings that are lacy in appearance. An adult also has an odd crystal-helmet-like structure over their head. The immature lace bugs do not have wings, are smaller than the adults, and have black, spiny projections all over their bodies. Adult females insert spindle‑shaped white eggs just under the lower leaf surface and cover with excrement.
All feeding activity occurs on the undersides of leaves. The insects have piercing‑sucking mouthparts that remove the contents of plant cells. There are up to four generations per year, and lace bugs survive the winter as eggs within the previous season’s leaves.
Control consists of insecticide treatments (both synthetic or organic) several times during the year. The eggs hatch when new growth begins during the spring. This is usually in late April to early May. Treatment at this time will greatly reduce the succeeding generations. Reproduction can continue through September, so insecticides should be applied if you see a resurgence in the insects.
For control recommendations, see HGIC 2051, Azalea & Rhododendron Insect Pests. Always read and follow label directions when using any pesticide.
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Q: I have an overgrown thuja with heathers growing underneath, which have become leggy. These are situated in a raised bed surrounding my patio, and provide a screen to the raised patio. What shall I plant instead and at what time of the year? UC, Co Limerick
Plants have unique natural abilities to emit different chemical substances. With them they repel or attract specific insects. Flowers bring a pretty sight and a pleasant fragrance for us. However, for pests they often pose a life threat. That’s why such plants can perfectly serve as a replacement for the synthetic insecticides, as long as you know how to use this to your advantage.
Q: We have a Malus (ornamental crab apple tree) in our back garden, which has grown from small to its present 20ft over 15 years. It buds and flowers nicely, but then turns a bit shabby. It doesn’t seem like a healthy tree. Can you help? We are debating whether we need to remove it and replace it. If it does need to be removed, what replacement would you suggest? CF, Co Kilkenny
Members of the Buttercup family are called Ranunculaceae. To grow the plants successfully beware the seeds tend to have a short period of viability and need planting straight away.
This species of plants originate in central China. The closely related species R. molle japonicum come from Japan. Both these deciduous varieties are relatives of the popular Ghent and Knapp Hill hybrids.
Autumn is the best time to plant Azaleas so you get a blaze of colour next spring. If you want to see the colour before you buy than aim for a pot grown plant in spring.
Azaleas are perennial flowering shrubs, bearing flowers from March to June (depending on the variety). There are thousands of cultivars to choose from, with flower colours ranging from pinks and purples to reds, oranges and yellows. Azaleas grow best in a shady bed or woodland border in the garden, but they also do well in pots. Some azaleas (sometimes known as greenhouse azaleas) are suitable for growing as house plants.
There is no reason why you should settle down for an empty, boring backyard when there is so much that can inspire you. Check out our post on how Your Backyard Can Be the Best Hang Out Place with these DIYs!