4 Enlargement of 3. Disease surveys were conducted to appraise the incidence and severity of major leaf diseases of rubber in the non-traditional rubber growing areas of South India. Rubber (Hevea brasiliensis) is grown on an area of about 80 000 ha in Burma of which approximately 55% is cultivated by smallholders. Apart from South American leaf Blight (SALB), other diseases of economic importance are the Gloeosporium leaf disease (Colletotrichum gloeosporioides), powdery mildew (Oidium heveae) and the Phytophthora leaf fall (Phytophthora spp.). Currently, data acquisition is obtained manually which results in lack effectiveness, costly, and typically labour incentive. R.A.M., 24, p. 204; 25, p. 183], it is stated that mildew damage (Oiditim heveae) [ibid., 30, p. 191] to rubber was particularly severe during the refoliation season of 1949 to 1950 in Ceylon, and was fairly general in all districts, even the low-country rubber receiving a serious setback. Hexaconazole 0.02% a.i (Contaf) is also effective. Erysiphe cichoracearum was formerly reported to be the primary causal organism throughout most of the world. Powdery mildew (Oidium heveae Steinm.) INTRODUCTION Powdery mildew of rubber tree (Oidium heveae) is an important leaf disease of Hevea brasiliensis plantations worldwide (Beeley, 1933; Saranya et al., 2005). 5 Primary conidia (stars), secondary conidia (triangles), conidiophores with noncatenate conidia, and hyphae with simple to lobed appressoria (arrows) of O. heveae. FORMULATION AND USE OF FUNGICIDES IN MINERAL OILS FOR RUBBER LEAF DISEASE CONTROL T. M. Lim Rubber Research I s i u e of Malaysia, nttt P.O. Factors affecting disease development are discussed. Beih Nova Hedwigia 89:1ââ¬â700 Figs. A Severe outbreak of this disease may cause an annual yield loss with 20% decrement of latex production in a rubber plantation. A severe outbreak of this disease may cause an annual yield loss with 20% decrement of latex production in a rubber plantation. A severe outbreak of this disease may cause an annual yield loss with 20% decrement of latex production in a rubber plantation. COMMON PESTS & DISEASES OF RUBBER GROUP : E 2. Symptoms and anamorph of Oidium heveae. The causal agent of this powdery mildew, previously known as Oidium heveae, has been identified under various names. This method could improve rubber resistance breeding process. One of the most important rubber leaf diseases in Malaysia is Oidium leaf disease. Common Diseases of Rubber and their Management *Sober Researc of Philippine Rubber Research Institute . SALB has been responsible for the failure of rubber plantations in South America and none of the Asian and African clones is tolerant to this disease. Oidium Leaf Disease is one of the most infected rubber leaf disease in Malaysia. Sphaerotheca fuliginea) being the most commonly reported cause. Rubber diseases in Burma. The presentation is all about disease of rubber tree . ... Oidium secondary leaf fall occurs after wintering but is not usually significant. The rubber sector in Cameroon is faced with the effects of global economic crisis and a drop in the yield of latex due to several pests and diseases. Download this stock image: Oidium leaf disease Oidium heveae infection on rubber leaves Malaysia - AT9RCM from Alamy's library of millions of high resolution stock photos, illustrations and vectors. Breeding for Disease Resistance. Abstract. is one of the most important leaf diseases in rubber tree (Hevea brasiliensis).However, physiological and molecular processes associated with the Hevea-powdery mildew interaction are still unclear.In this study, effects of powdery mildew infection on the mitochondrial and chloroplast functions in rubber tree were comprehensively investigated. These diseases are: (1) secondary leaf fall (Oidium heveae and Colletotrichum gloeosporioides); (2) abnormal leaf fall (Phytophthora botryosa); (3) leaf fall (Corynespora cassiicola), and (4) birds eye spot (Bipolaris heveae). The most important and widespread disease is P. pod rot and leaf fall, which causes serious defoliation in some material; striking resistance is occasionally found. For root infection, see the treatment for brown root disease. Abstract The most common diseases (19) and insects (13) on rubber trees in Vietnam have been identified. Oidium leaf fall (O. heveae), Colletotrichum leaf fall (C. gloeosporioides [Glomerella cingulata]), Phytophthora leaf fall (P. palmivora and P. botryosa), pink disease (Corticium salmonicolor) and stripe canker (P. The 5 most important diseases were studied in detail, i.e. Powdery mildew is a fungal disease that affects a wide range of plants. USE OF WEATHER DATA FOR THE CONTROL OF HEVEA DISEASES 21} TABLE 3 PERCENTAGE VIABILITY OF Gloeosporium SPORES AFTER EXPOSURE TO UV LIGHT Period (min) of exposure % Viability i 0 94.6 2 86. o 3 61.4 5 24.4 7 0 10 0 The incidence of Oidium leaf disease is mild when the refoliation period coincides with a spell of bright sunny weather, which also tends to increase the ⦠Box 150, Kuala Lumpur, Malaysia Abstract - In Malaysia, the leaf fungi Oidium heveae and Colletotriohum gloeosporioides attack and pre-maturely defoliate young leaves during warm, moist weather at the beginning of the year. Oidium Leaf Disease is one of the most infected rubber leaf disease in Malaysia. In Nigeria, the most devastating diseases of rubber seedlings and budded plants in the nursery are the leaf diseases ⦠OLF is a signiï¬cant limiting factor for rubber production areas, especially in high humidity areas. The wintering (natural leaf shedding) of rubber is nature's way to help to renew and eliminate disease foliage. Powdery mildew disease of rubber trees affects young rubber leaves, buds, inflorescences and other immature tissues reducing rubber latex yields by up to 45%. However, root diseases, especially white root disease, will continue to pose a challenge during both mature and immature stages of rubber. 3 Colonies of O. heveae on a rubber leaf. Powdery mildew of rubber tree caused by Oidium heveae is an important disease of rubber plantations worldwide. Key words: Hevea brasiliensis, Oidium heveae, in vitro culture, nutrient solution, phenological phase. Symptoms of the major fungal diseases infecting leaves of rubber (Hevea) in Malaysia are outlined. Common Diseases of Rubber and their Management I. Foliar Diseases 1. Powdery mildew diseases are caused by many different species of fungi in the order Erysiphales, with Podosphaera xanthii (a.k.a. The OLF can reduce rubber yield up to 45%. Avoid accumulation of rubber at the base of the tree. In this paper read at the Conference of Rubber Research Institutes in the Far East, held at Bogor, 15th to 17th July, 1952, notes are given on work carried out in Malaya on leaf diseases of rubber associated with Gloeosporium albo-rubrum [R.A.M., 32, p. 588; 33, p. 256], Colletotrichum ficus [32, p. 338], C. derridis [loc. Brown root disease Bipolaris heveae), and (4) Corynespora leaf fall, caused by Corynespora cassiicola. Rubber trees are susceptible to diseases caused by numerous pathogens, for example, Oidium, Colletotrichum, Fusicoccum, and Corynespora. Disease of horticulture crop and there management. 22 [cf. Identification and classification of this fungus is still uncertain because there is no authoritative report of its morphology and no record of its teleomorphic stage. of the enough (Lim et al. Rubber powdery mildew caused by the foliar fungi Oidium heveae is one of the main diseases affecting rubber plantations (Hevea brasiliensis) worldwide. 3ââ¬â5. On the Oidium leaf fall (OLF) disease, changes in the rainfall, increasing temperatures, mist and high humidity can increased the incidence of this disease. It only covers the major disease of rubber tree in i⦠The scientific classification of C. cassiicola is shown in Table 1. Fortunately, except on its India the is growing warrant countries, expenditure 1981; Tand and John, rubber to fogging copper-in-oil or captafol-in-oil, by Phytophthora severity not of control. Leaf spot/bird's eye spot Symptom 'Numerous small circular spots scattered on the leaf surface 'Spot have transparent centers and ... Oidium hereae . The rubber tree is affected by a number of diseases of economic important and they can be divided for convenience into four categories. Most of the major diseases of Hevea brasiliensis are of worldwide distribution (with the notable exception of South American leaf blight, against which strict quarantine regulations are enforced by rubber-growing countries outside the Americas to prevent the unauthorised import of Hevea) but their local severity and importance vary from one region to another. Oidium heveae and Corynespora leaf fall caused by Corynespora cassiicola (Manju et al., 2002). As well as pest attack also harmful to rubber plant. To prevent and control this disease, fungicides causing serious environmental problems are widely used. -Oidium heveae â powdery mildew of rubber or Secondary leaf fall disease-Attack young leaves of rubber.-Control: sulfur dusting, fogging with Calaxin Neni Kartini Che Mohd Ramli 34Control: sulfur dusting, fogging with Calaxin Neni Kartini Che Mohd Ramli 34 rubber tree also faced several diseases that influence rubber production. Abstract. A survey was made of rubber disease incidence in Burma, where disease severity is closely linked to climatic conditions. Recent technology using unmanned aerial vehicle (UAV) has potential to provide cost effective data acquisition for the estimation of rubber leaf disease such as Oidium Disease. It is one of the most important leaf diseases in rubber plantations worldwide. disease spread with alarming rapidity, specially at higher elevations in the mid-country rubber growing areas. ABSTRACT . In this circular, which revises and brings up to date No. Rubber - Hevea brasiliensis the important plantation crops in srilanka. Clonal specificity is evident towards resistance to these diseases (Wycherly 1969). These diseases attacked four major parts of rubber tree which are the leaves, stem, panel and root area. Apply a wound dressing compound in which Thiride 0.75% a.i is incorporated. Abnormal leaf fall (ALF) disease caused by Phytophthora sp., powdery mildew (PM) caused Field experiments were carried out on Oidium control, for six successive years commencing from 1930, in the Matale District. It is particularly serious in sub-optimal growing areas, such as Xishuangbanna in SW China. cit. Download this stock image: Oidium leaf disease Oidium heveae infection on rubber leaves Malaysia - APFJJB from Alamy's library of millions of high resolution stock photos, illustrations and vectors. Rubber diseas 1. Major leaf diseases of rubber are reviewed, such as: (1) secondary leaf fall caused by Oidium heveae and Colletotrichum gloeosporioides; (2) phytophthora abnormal leaf fall (Phytophthora botryosa); (3) birds eye spot (Drechslera heveae, syn. Commonly reported cause throughout most of the world renew and eliminate disease.... Specially at higher elevations in the mid-country rubber growing areas, especially in high humidity.... 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