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Azalea: Difference between revisions
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== Anatomy == | == Anatomy == | ||
[[Image:Rhododendron japonicum (Gray) Sur..jpg|thumb|150px|left|Description]] | [[Image:Rhododendron japonicum (Gray) Sur..jpg|thumb|150px|left|Description]] | ||
There are several different types of both flower and leaf shapes for Azaleas. Ventricose-campanulate, flat saucer shaped, widely funnel shaped, openly funnel shaped, campanulate, openly campanulate, tubular, rotate, tubular funnel shaped and funnel shaped are the different types or shapes of the flower itself. The flowers come in all different colors. For leaves there are linear, oblong, obovate, | There are several different types of both flower and leaf shapes for Azaleas. Ventricose-campanulate, flat saucer shaped, widely funnel shaped, openly funnel shaped, campanulate, openly campanulate, tubular, rotate, tubular funnel shaped and funnel shaped are the different types or shapes of the flower itself. The flowers come in all different colors. For leaves there are linear, oblong, obovate, orbicular, elliptic, ovate, lanceolate, and oblanceolate. <ref name=Greer>Greer. "Greer's Guidebook to Available Rhododendrons third edition" Offshoot publications, 1996. (p.8).</ref> | ||
There are only five lobes to the flower on Azaleas. They only have one stamen for each lobe. The Azalea usually has hair that grows parallel to the surface of the leaf, this is called oppressed hairs.<ref name=greer9>Greer, p.9</ref> | There are only five lobes to the flower on Azaleas. They only have one stamen for each lobe. The Azalea usually has hair that grows parallel to the surface of the leaf, this is called oppressed hairs.<ref name=greer9>Greer, p.9</ref> | ||
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Layering is a way to make the new plant identical to the parent plant. This is where a low limb of the plant is pulled down onto the ground, covered with loose soil and weighed down with a rock. This form of propagation takes at least a year to start to really grow.<ref>Greer, p.10</ref> | Layering is a way to make the new plant identical to the parent plant. This is where a low limb of the plant is pulled down onto the ground, covered with loose soil and weighed down with a rock. This form of propagation takes at least a year to start to really grow.<ref>Greer, p.10</ref> | ||
Tissue culture is taking a piece of tissue and placing it in a sterile | Tissue culture is taking a piece of tissue and placing it in a sterile petri dish with growth media (this process is not for the everyday gardener). With the use of agars and [[hormones]] (auxins, etc.), proper temperatures and light, and absolute sanitation, the piece of tissue is induced to mature into multiple seedling-like growths, but with no roots. Then the tiny plantlet is then rooted.<ref>Greer, p.10</ref> | ||
Seeding is a sexual and natural reproduction rather than all of the above being vegetative propagation. As a result this plant will not be a clone. A seed is very tiny, as a result it requires a smooth fine surface in order to start growing. The seed usually takes any where from three to eight weeks, in some cases it might take longer to sprout.<ref>Greer, p.10</ref> | Seeding is a sexual and natural reproduction rather than all of the above being vegetative propagation. As a result this plant will not be a clone. A seed is very tiny, as a result it requires a smooth fine surface in order to start growing. The seed usually takes any where from three to eight weeks, in some cases it might take longer to sprout.<ref>Greer, p.10</ref> | ||
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== Ecology == | == Ecology == | ||
[[Image:Rhododendron oblongifolium.jpg|thumb|150px|left|Description]] | [[Image:Rhododendron oblongifolium.jpg|thumb|150px|left|Description]] | ||
There are insects and other pests that a gardener must watch for and get rid of to keep healthy Azaleas. These pests include; the root weevil, bark scale, aphids, leaf miners, caterpillars, leaf rollers, sawflies, spider mites, lacebugs, | There are insects and other pests that a gardener must watch for and get rid of to keep healthy Azaleas. These pests include; the root weevil, bark scale, [[aphids]], [[leaf miners]], [[caterpillars]], [[leaf rollers]], [[sawflies]], [[spider mites]], [[lacebugs]], [[whiteflies]], [[slugs]], and [[snails]]. <ref>Greer, p.15-16</ref> | ||
The root weevil tends to be a common problem with Azalea plant damage. The larvae does the most damage and it is impossible to see that damage is occurring until it is too late. The larvae eats the roots, as well as the cambium layer so the plant is unable to feed the top of the plant. The adult root weevils feed on the plant at night when it is fairly warm. To control these pests, one should spray Orthene on the foliage about every three weeks for about May to October, depending on the weather. <ref>Greer, p.15</ref> | The root weevil tends to be a common problem with Azalea plant damage. The larvae does the most damage and it is impossible to see that damage is occurring until it is too late. The larvae eats the roots, as well as the cambium layer so the plant is unable to feed the top of the plant. The adult root weevils feed on the plant at night when it is fairly warm. To control these pests, one should spray Orthene on the foliage about every three weeks for about May to October, depending on the weather. <ref>Greer, p.15</ref> | ||
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When small insects that suck to feed on the bark, a sticky substance exudes and turns the stems black. This is called bark scale. In order to control use Orthene. <ref>Greer, p.16</ref> | When small insects that suck to feed on the bark, a sticky substance exudes and turns the stems black. This is called bark scale. In order to control use Orthene. <ref>Greer, p.16</ref> | ||
Aphids (a sucking insect) feed on new foliage as it begins to grow, making the leaves to have distorted shapes. In order to control Aphids, use Malathion, | [[Aphids]] (a sucking insect) feed on new foliage as it begins to grow, making the leaves to have distorted shapes. In order to control Aphids, use Malathion, Diazinon, or Orthene. <ref>Greer, p.16</ref> | ||
Caterpillars, leaf rollers, and sawflies all chew on new foliage. They eat out large areas of new growth. Most of the damage is done to new growth. To kill use Orthene, Malathion, or Diazinon. <ref>Greer, p.16</ref> | Caterpillars, leaf rollers, and sawflies all chew on new foliage. They eat out large areas of new growth. Most of the damage is done to new growth. To kill use Orthene, Malathion, or Diazinon. <ref>Greer, p.16</ref> | ||
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The pest that causes the top of leaves to turn a brown-green color is the spider mite. They are a red color and are eight-legged. They suck on the bottom of the leaf, thus causing the discoloration. <ref>Greer, p.16</ref> | The pest that causes the top of leaves to turn a brown-green color is the spider mite. They are a red color and are eight-legged. They suck on the bottom of the leaf, thus causing the discoloration. <ref>Greer, p.16</ref> | ||
Lacebugs are small and have transparent wings. They suck on the bottom of leaves. The underside of the leaf will be a brown residue that has been exuded by the pest while on top of the leaf it turns to a gray-brown color. To remove lacebugs, use Orthene or Malathion. <ref>Greer, p.16</ref> | [[Lacebugs]] are small and have transparent wings. They suck on the bottom of leaves. The underside of the leaf will be a brown residue that has been exuded by the pest while on top of the leaf it turns to a gray-brown color. To remove lacebugs, use Orthene or Malathion. <ref>Greer, p.16</ref> | ||
The | The [[whitefly]] looks like an aphid with wings. It leaves white spots at the locations where it has been. It sucks the underside of leaves. Use Malathion, Diazinon, or Orthene to exterminate. <ref>Greer, p.16</ref> | ||
Slugs and Snails feed on flowers and new growth. Use | Slugs and Snails feed on flowers and new growth. Use Metaldehyde baits or sprays to control. <ref>Greer, p.16</ref> | ||
== Festivities == | == Festivities == | ||
