Article Per Year (5 Year)
p-Index From 2021 - 2026
0
P-Index
This Author published in this journals
All Journal Jurnal Wasian
Margaretta, Margaretta Christita
Unknown Affiliation
Earth & Planetary Sciences Environmental Science Physics Other

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Identification Causes Leaf Spot Disease in Cempaka (Magnolia elegans (Blume.) H.Keng) Seedling and Its Control Techniques Irawan, Arif Irawan; Anggraeni, Illa Anggraeni; Margaretta, Margaretta Christita
Jurnal Wasian Vol. 2 No. 2 (2015): December
Publisher : Forestry Department, University of Muhammadiyah Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62142/mhayeq96

Abstract

This research purposes to identify the pathogen causing leaf spot in cempaka seedling and its control technique. Identify cause of disease is necessary to know precise technique control. Identification of disease was conducted in macroscopic appearances and microscopically to determine pathogens. Identification is done by using the determination key of fungi. The results showed that the early signs of leaf spot disease on cempaka seedlings in the nursery are streaks or spots on the leaf surface with distinct boundaries. Leaf spots are formed generally brown surrounded by darker boundaries. The result shows leaf spot disease on cempaka seedling was caused by fungal pathogen Colletotrichum sp. Techniques for controlling the disease can be done by isolating the infected seeds, reducing the intensity of canopy, and using the appropriate fungicides.
Identification of Water Bacteria from Nickel Post Mining in East Halmahera Margaretta, Margaretta Christita; Iwanuddin , Iwanuddin Iwanuddin; Yermias, Yermias Kafiar; Supratman , Supratman Tabba
Jurnal Wasian Vol. 5 No. 1 (2018): June
Publisher : Forestry Department, University of Muhammadiyah Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62142/x32gnn20

Abstract

Nickel mining impact in heavy metal pollution on both soil and water. A method that is widely applied to reduce heavy metal contamination is bioremediation. Selection of bacteria that have potential reduction of heavy metal contamination in soil is very important in bioremediation process. The first step to select the potential bacteria is identification of samples. The purpose of this study is to identify existings bacteria in pond after nickel mining area PT. Antam, East Halmahera. Methods used in this research are isolation and identification of bacteria by conventional methods includes morphological, physiologica,l and biochemical test. Identification using Bergey’s Manual Determinative. The results showed there are 6 genera types of bacteria there are Bacillus, Esherichia, Enterococcus, Pseudomonas, Staphylococcus, dan Klebsiella, with 18 species in water of nickel post mining. Morphologically it is dominated by genus Bacillus as 50 % of the species. The identification of bacteria proved an existence of indigenous bacteria which is resistant to heavy metal stress.
The Diversity of Macroscopic Fungi Species of The Wallacea in The Arboretum of BP2LHK Manado Anita , Anita Mayasari; Margaretta, Margaretta Christita; Suryawan, Ady Suryawan
Jurnal Wasian Vol. 5 No. 2 (2018): December
Publisher : Forestry Department, University of Muhammadiyah Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62142/vs1xv140

Abstract

Fungi have a vital role in ecological processes, as an indicator of health of an ecosystem, it is not only has the potency for medicine and food but also variety of unexplored potential. Arboretum has high potential for biological conservation including fungi species, so information on its diversity and potency are very important for the basis of its management. The purpose of this research was to explore the diversity of species and the potential of macroscopic fungi in the BP2LHK Manado Arboretum. Observations were conducted 8 times in May, June, and September 2016 using a cruise and an opportunistic method. The infromation of growth media, light intensity, and temperature were collected as a supporting data. The result showed that arboretum stored 48 species of macroscopic fungi with different characteristics. 39 species were identified, divided into 2 divisions, 6 classes, 9 orders, and 17 families, while the remaining 9 species were unidentified.. The results showed that the diversity of macroscopic species habitat were dominated by 31 species grown on necromass, 11 species grown on litter and 6 species grown on soil. Based on its potential, there were 2 species of toxic fungi, 1 species of edible and medicinal fungus, 2 species of edible fungi, 5 species with medicinal fungi, 19 species were not edible, and 19 species with unknown benefits.
Co-Authors Anggraeni, Illa Anggraeni Anita , Anita Mayasari Irawan, Arif Irawan Iwanuddin , Iwanuddin Iwanuddin Supratman , Supratman Tabba Suryawan, Ady Suryawan Yermias, Yermias Kafiar