Combination of the aspects of forestry and agriculture is termed as “Agroforestry”. It is a cultivation system which integrates the forest enterprises and rural development; to manage pests, diseases as well as weeds. Inspite of the fact; that pests and pathogens are interlinked with agroforestry measures; few agroforestry studies provide authentic knowledge on such interactions. Furthermore, quantitative analyses regarding the impacts of agroforestry on disease as well as pest control are still lacking1.
Earlier studies have investigated the incidence of dieback disease to the plant species that used in the agroforestry system such as jabon2 and olive trees (Olea europaea)3. Sengon (Paraserienthes falcataria (L.) Nielsen) is a plant species in forestry plantation while rice (Oryza sativa) is an agricultural crop which potentially used in the agroforestry system and consumed in a large amount worldwide as well as easy to be cultivated. Both species are susceptible to dieback disease too. This disease inhibits the regeneration of plants at seedlings stage so that it will affect the quantity and quality of plant. Furthermore4, dieback disease potentially causes a high mortality rate of early stage of plant all over the world.
A research was performed to isolate and identify the dieback disease on sengon seedlings, to understand the pathogenicity of dieback fungus to the seedlings of sengon and rice. Morphological identification was also done to check symptoms of dieback disease; macroscopically as well as microscopically. The morphological identification was based on Barnett and Hunter5. Koch’s postulates test was performed to prove that the isolated fungus is a major cause of dieback disease symptom. This test consisted of inoculation of fungi to the sample, re-isolation of symptomatic plant tissue and identification of the result of re-isolation6. Pathogenicity test was completely randomized design (CRD). The treatments were control, wounded by carborundum, inoculated with pathogen as well as inoculated with pathogen and wounded by carborundum.
It was revealed the greatest percentage of dieback disease on sengon and rice was occurred on the treatment of inoculation with wound both100%. While, the greatest percentage of dieback disease intensity of sengon and rice was obtained on the treatment of inoculation with wound by 98.2 and 40.6% respectively. Through careful examination; Ceratobasidium ramicola was found culprit; which cause dieback disease on sengon seedlings and rice. These plants are more susceptible to the fungal pathogen particularly after inoculation and wound treatment. Thorough investigation is required to perform control measures in order to manage disease attack in the plants.
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25 August, 2019