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Articles by Achmad
Total Records ( 3 ) for Achmad
  Achmad and P. Arshinta
  Jabon (Anthocephalus cadamba (Roxb.) Miq.), also known as kadam, is among fast-growing tree species and has been considered as one of the promising plantation commodities. This study aimed to investigate the disease incidence and disease severity of jabon dieback in seedling as affected by pH and shaking intensity of Botryodiplodia sp. medium. Results revealed that the growth of the fungi was inhibited at pH 2 as shown by the diameter of colony formed and the much lower biomass as compared to control. Shaking intensity at 50 rpm showed the highest mycelial biomass of Botryodiplodia sp., followed by that of 100, 150 and 0 rpm. The dieback disease of jabon seedlings at all ages (3-5 months) only occurred in the treatment with inoculation with Botryodiplodia sp., fungal pathogen while the control treatment (no inoculation) did not show any symptom of the disease. The severity of dieback disease on jabon seedling was highest at 3 months old and less at other ages.
  Muhammad Alam Firmansyah , Erfiani , Anuraga Jayanegara , Nurheni Wijayanto and Achmad
  Background and Objective: 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. Both species are susceptible to dieback disease. This study aimed to isolate and identify the dieback disease on sengon seedlings to understand the pathogenicity of fungal dieback disease on the seedlings of both sengon and rice and to observe the symptom of dieback disease both macroscopically and microscopically. Materials and Methods: Pathogenicity test was conducted in a factorial completely randomized design (CRD). The treatments were control, wounded by carborundum, inoculated with pathogen as well as inoculated with pathogen and wounded by carborundum. Results: Results revealed that 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. The PCR result identified that the pathogen was Ceratobasidium ramicola that form imperfect state as Rhizoctonia sp. Conclusion: This species of fungal pathogen is the major cause of dieback disease on sengon and rice seedlings due to seedlings death.
  Achmad , Muhammad Alam Firmansyah , Bonny P.W. Soekarno and Arief B. Witarto
  This study investigated the efficacy of tannin in order to control leaf blight disease on Toona sureni caused by Rhizoctonia sp. by measuring disease intensity and percentage of leaf damages. Two Rhizoctonia sp. (R1 and R2) isolates were induced on the T. sureni leaves. Tannin solution with concentration of 0.5, 1, 2 and 3% and control (water) were sprayed on the leaves surface every two days. The percentage of disease sign on the leaves was measured every two days for one month. Results revealed that all tannin solution treatments reduced intensity and leaf death percentage. No poisonous impacts on the seedling were observed. The highest tannin concentrations which reduce disease activity were 3% for both isolates. It reduced the disease by stopping the fungal enzymatic activity of cellulolytic and pectinolytic. The highest increase of disease intensity and the percentage of leaf death was found in the control treatment. It can be concluded that tannin could be used to control leaf blight disease on Toona sureni caused by Rhizoctonia sp.
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