These may be in the form of black spots or brownish spots that converge killing the leaf. The fruit and stems are also infected causing them to turn brown-black and whither. Commonly occurring in wet soils. A fungal problem that attacks the leaves and may spread to other parts. is found on many species of banana causing pale yellow streaks on the young leaves to turn brown with dark spots. that infects legumes during humid weather with water soaked spots on the leaves and stems near the base. The zoospores are easily moved in water flowing through soil and so are easily dispersed down slopes. Alex Palm, Alexandra Palm, Princess Alexandra Palm. and infected plants wilt, collapse and die. and (Pestalotiopsis spp.). Smaller plants may be sprayed with contact insecticides with a wetting agent. Generally the adult deposits up to 30 eggs (egg pod) in the soil during spring, summer and autumn with up to two or more generations per year. ). The chlamydospores can be transported in soil, even extremely small amounts, allowing the pathogen to be dispersed very easily throughout an area and from one location to another. There are usually two hatches each year, in early spring and late summer. Healthy plants are less susceptible to attack, so maintain vigour of the plant and avoid using high-nitrogen fertiliser that produces excessive soft young growth. The embryo must be alive (a viable seed). The leaves may also have these symptoms but is not commonly seen. Scientific Name: Archontophoenix alexandrae Common Names: Alexandra Palm, King Palm, Northern Bangalow Palm Plant Characteristics. forms dark brown to black patches that enlarge and distort immature leaves. Cynodon dactylon (common couch) is most susceptible and found in bowling or golf greens where it is a serious problem. Leaf Blight (Pestalotia palmarum) infects several palms including Syagrus romanzoffianum and leaf blight (Pestalotia palmicola) attacks Phoenix, Syagrus and Washingtonia species. leaf spots including (Alternaria species), (, species are infected by several leaf spots, usually as a secondary infection after aphid attack. forms water soaked or greasy angular spots on the pods or stems of the host. A key feature of the Alexander Palm is its capacity to tolerate heavy inundation under heavy rain events. All trees have flowers and fruits are red. Inflorescences under the leaves (infrafoliar), initially enclosed in three deciduous bracts of pale green colour, panicle, up to 80 cm long, of cream white colour, proterandrous (the male flowers ripe before the female ones, this avoids the self-fecundation favouring the crossed one), initially erect, then drooping in fruit, with four orders of ramifications and unisexual flowers united in groups of three (a female flower between two male ones). Many seeds have different methods of seed preparation for germination such as nicking or cutting the seed coat to allow water penetration, also placing seeds in hot water and allowing it to cool off. The styles are rarely elongated and normally the arrangement is a three lobed fleshy stigma that is sessile on the ovary. which forms water-soaked leaf spots that turn brown. Archontophoenix alexandrae is a more marginal palm than the much more commonly grown Archontophoenix cunninghammiana (here in the US called the King Palm, while in its native Australia, it is Archontophoenix alexandrae that is called the King Palm), but it still is a pretty commonly grown landscape and garden palm in the less chilly areas of California. Infected leaves die and fall from the plant. Typically, this plant can handle any sunlight, but make sure to protect from extreme heat. The host plant has large pieces of its leaves eaten, the bark is nibbled and almost any part of the plant attacked. Phytophthora in Eucalyptus species Frond leaflets are broader than those of Archontophoenix alexandrae, trunk is … This pest is also known as Ribbed Scale or Bark-louse. Flowers are deformed if they bloom and the infection can also be seen in the new growth, eventually killing the plant. Hibiscus rosa-sinensis, Hibiscus syriacus and Hibiscus tiliaceus are susceptible to several fungal leaf spots including (Ascochyta abelmoschi), (Cerospora kellermanii) and (Phyllosticta hibiscina). These spots are a dull yellowish brown but can also have purplish patterns. Adiantum, Asplenium, Blechnum, Cyathea, Davallia, Nephrolepis, Platycerium, Polypodium and Pteris species are infected by the leaf spot (Pseudocercopora species) which forms circular brown spots on the fronds and heavy infection can defoliate a plant. The excretion of honeydew promotes sooty mold that restricts the leaves capability to photosynthesize. giving the leaf a scorched appearance as large blotches appear from the margin or apex and turn brown with a papery texture. This fungus prefers a warm humid environment and leafy plants with soft new growth, particularly if they are crowded. The adults appear during the warmer months of the year. Bougainvillea species are infected by the leaf spot (Cercosporidium bougainvilleae) which forms rounded spots with dark margins that yellowish ting. Passiflora species are infected with many types of leaf spot such as (Alternaria passiflorae). Grasshoppers and locusts are simular but varying in colour. DESCRIPTION. Primula species are infected by the Leaf Blight (Phyllosticta prinulicola). This infection commences with pale green water soaked spots or areas appearing on the leaves. The petiole in short and commonly twisted and the smooth green crown shaft is up to 1 m (3 ft) long. that attacks roots, trunk, stems and leaves. Ornamental trees and shrubs are also attacked including fruit trees and citrus, Liquidambar, Salix, Nerium, Magnolia, and Rosa species. Salix species are infected by several fungal leaf spots including (Ascochyta salicis) and (Septogloeum salicinum). that forms greyish spots with brown water soaked borders and coalesce on the upper part of the leaf. Fuchsia species may be infected by the leaf spot (Septoria species) or ( Cercospora species), both form spots with dead centres and dark margins.

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