Azalea, Rhododendron

Representative Chemicals Azalea Rhododendron Synonyms Rhododendron catabiense, Ericaceae (heath) family Catawba rhododendron-. Mountain rosebay Purple laurel Rhodora Rosa Laurel Rosebay... 

INFLUENCE OF PHOTOSYNTHETIC CAPACITY, IRRADIANCE AND SO2 FUMIGATION ON SHOOT GROWTH OF AZALEA (RHODODENDRON) CULTIVARS... 

Azalea (Rhododendron) shoot growth is of considerable concern to commercial growers, because it requires considerable cultural time. Ceulemans et al. (2) found a positive relationship between photosynthesis and shoot growth of closely related greenhouse cultlvars. 

Influence of Photosynthetic Capacity, Irradiance and SO2 Fumigation on Shoot Growth of Azalea (Rhododendron) Cultivars 603... 

Jeon JS, Kim HG, Um BH, Kim CY (2011) Rapid detection of antioxidant llavonoids in Azalea Rhododendron mucronulatum) flowers using on-line HPLC-ABTS plus system and preparative isolation of three llavonoids by centrifugal partition chromatography. Sep Sci Technol 46 518-524... 

Special purpose acid-loving flowering shrubs 12-10-4 azaleas, rhododendrons, camellias, gardenias... 

By the aid of the processes described Tunmann claims to have discovered the resinogenous layer in all the plants examined by him. In the course of his investigations he was able to determine various typical forms of the layer. These he divides into three principal types the rod-type (Viola Fraxinus, Alnus), the vacuola-type (Salvia.Hyssopus), and the mesh or grille-type (Rhododendron, Azalea). 

Ironically, coffee does need relatively acidic soil, with pH between 5 and 6. Conifers and shmbs such as azaleas and rhododendrons thrive on soils with this acidity, as do tea, potatoes, rice, and rye. The vast majority of crop plants, including most vegetables, need soils just on the acidic side of neutral, pH between 6 and 7. Only a few crops—barley, sugar beets, cotton, and sugarcane—like soils on the mildly basic side, between pH 7 and 8, and only desert plants can cope with soils whose pH is greater than 8. 

Azalea japonica A. Gray A. mollis Blume A. pontica var. sinensis Lindl. Yang Zhi Zu (Azalea) See Rhododendron sinensis ... 

Rhododendron molle (Blume) G. Don Ba Li Ma (Chinese azalea, yellow azalea) (fruit) Rhomotoxin.37-144 This herb is toxic. Treats tachycardia, palpitations, hypertension. 

Rhododendron mucronatum G. Don Bai Du Juan Hua (white azalea) (flower) Essential oil, germacrone, farreol, grayanotoxin, gossypetin, azaleatin, 5-methyl kaempferol, 5-methyl myricetin, syringic acid, dihydroquercetin, coumarins, phenolic acid, p-hydroxybenzoic acid, protocatechuic acid, vanillic acid.48 Treat cough, asthma, headache, respiratory infection. 

The family is cosmopolitan with the exception of deserts. It contains many of our familiar ornamentals (rhododendron, azalea, etc.), fruits (blueberries, cranberries, and relatives), briar, and wintergreen. 

Set out in spring as balled-and-burlapped or container-grown plants. Sun or partial shade suits them well the further south, the more shade they need. Rhododendrons and azaleas require cool, moist, highly organic, acid soil. Choose a site where they won t be exposed to hot summer or drying winter winds. Their... 

Leaves with spots. Cause Leaf spots. Several species of fungi cause leaf spots on rhododendrons and azaleas. 

Leaves with spots. Cause Leaf spots. Several kinds of fungi cause spots on azalea and rhododendron leaves. For an illustration of this problem, see page 201. For control measures, see Leaves with spots on page 237. 

Leaves yellowed. Cause High soil pH. Chlorosis (yellowed leaves) is most common on azaleas and rhododendrons used in foundation plantings. Lime leaches from the foundation of the house, making the soil too alkaline. Restore soil acidity by applying 2-3 pounds of sulfur per 100 square feet of growing area ... 

Leaves with green, white, or brown galls. Cause Azalea leaf gall. This fungal leaf gall attacks both azaleas and rhododendrons. Pick off and destroy infected leaves as soon as you spot the galls. 

Plants Affected Acid-loving plants, including blueberries, oaks, hollies, azaleas, and rhododendrons. 

Plants Affected Fungal leaf galls are most common on azaleas and rhododendrons. Camellias may also get leaf galls. 

There are several cases of animal poisonings from Rhododendrons. Goats that ingested branches of an azalea plant presented with profuse vomiting, central nervous system depression, and fasciculations. Other animals with reported poisoning include donkeys, dogs, and kangaroos. 

Rhododendron ponticum. Common Rhododendron Rhododendron chrysanthum. Yellow Alpine Rose Rhododendron luteum Rhododendron ferrugineum, Alpine Rose Rhododendron hirsutum, Alpine Rose Rhododendron simsii, Azalea... 

The more fibrous types of peat may be used to advantage as mulches for flowers, shrubbery and other plants. The more acid peats are suitable for use around rhododendrons, azaleas, and any acid-loving plants. The more decomposed types of peats and mucks are less suitable as mulches, because of the difficulty in wetting them and because of their tendency to float or blow away. The-slow-wetting qualities may also interfere with infiltration and favor runoff. This is much more apt to occur where peat is used as a mulch than if mixed with even a small portion of the surface layer of soil. 

Height reduction can be achieved with virtually all of the new compounds in many ornamental plant species such as chrysanthemum, poinsettia, tulip, azalea, and lily [4, 20, 23, 35, 49]. The formation of flower buds was promoted by uniconazole in azalea and rhododendron [35]. 

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