The camellia next to it is showing a classic sign of nitrogen deficiency - an even yellowing of the leaves. Treating bronzed camellia leaves. Camellias Australia Incorporated was established in 1952 as the Australian Camellia Research Society “to encourage investigation and research into matters concerning the genus Camellia, to collect information and publish the findings, and by appropriate means to make the genus, its species, hybrids and cultivars known and appreciated throughout Australia.” Two main species of camellia are grown in Australian gardens: Camellia sasanqua and Camellia japonica. Camellia Petal Blight (Ciborinia Camelliae) Just the mention of this disease leaves Australian camellia growers in a cold sweat! Camellias thrive in shaded areas and prefer slightly acidic, well-draining soil rich in organic content. Question: The leaves of my camellia have raised corky spots and patches underneath. This unnamed virus is associated with marbled flower colours, and camellia breeders sometimes deliberately infect … Common Camellia Diseases and Problems – Yellow Leaves Yellow Leaves. This fungal disease generally occurs in spring and is usually due to abundant moisture. Yellow leaves can indicate that a plant is suffering from a nutrient deficiency or is affected by cold weather, but yellow blotches on camellia leaves are often caused by a virus. The leaves will … Generally it is only a few leaves and these can simply be pruned away. At present camellia petal blight is not in Australia, however our friends in New Zealand and the UK are the most recent additions to the list of infected countries, which includes China, Japan, USA and most of Western Europe. The best method of resistance is keeping your camellias as vigorous as possible through proper maintenance. There are not many – but you will encounter a few pests and diseases with camellias. The AGM will be held on ZOOM. are an attractive addition to any yard. Scale & Mites. Camellia Dieback & Canker: This is one of the most serious of all camellia diseases and is caused by the fungus Glomerella cingulata. Camellias Australia Incorporated was established in 1952 as the Australian Camellia Research Society “to encourage investigation and research into matters concerning the genus Camellia, to collect information and publish the findings, and by appropriate means to make the genus, its species, hybrids and cultivars known and appreciated throughout Australia.”. This year’s Congress was being hosted in Gippsland and has been cancelled and hopefully will take place in 2021! The Early History of Australian Camellia Research Society (now Camellias Australia), Araluen Botanic Park, Perth, Western Australia, Eryldene, the Spiritual Home of Camellias, Royal Botanic Gardens, Melbourne, Victoria, Willans’ Hill – Home of the Botanic Gardens of Wagga Wagga, Optimismisation – Securing the Future of Australian Camelias, Disbudding, Balling and Bud Drop on Camellias, Development of a natural spray against camellia petal blight. The fertilizer has to be used at the end of flowering and in limited quantities. Many of the common problems arise from growing these woodland, acid-loving plants in the wrong conditions, although they are also prone to a range of pests and diseases.Here we give answers to many of the common problems encountered. Common Camellia Diseases and Problems – Yellow Leaves Yellow Leaves. If it is a mineral deficiency this can be solved by fertilising, best carried out in summer. Generally it is only a few leaves and these can simply be pruned away. Camellia tea mites cause bronzing along the middle of the leaf and leaves may curl and have a dull appearance. Both usually start at the underside of the leaves. Affected parts can be picked off, ideally before the white bloom of fungal spores is produced. Petal blight affects camellia flowers, causing them to turn brown. Mites like dry conditions, so hose your plants to increase humidity. Poor absorption of fertilizer causes brown spots on leaves.