Background:&nbsp;Delonix regia is a flowering tree of the Fabaceae family, widely grown as an ornamental plant in urban areas and considered a symbol of summer in Vietnamese culture. From January 2023 to November 2024, more than 100 cases of Delonix regia trees dying from a fungus growing at the base or roots of the trees were recorded in Hue city, Vietnam. The study determines the causal organisms for management purposes urban green trees. 
 
Methods:&nbsp;Fruit body samples collected from the wild were analysed morphologically following the method of Trinh Tam Kiet. Microscopic structures of fungal hyphae, spores and hymenium holes were observed and photographed using an Olympus BX51 optical microscope. Sample were sterilized with&nbsp; alcohol 70% to isolate fungal hyphae using the tissue culture to create pure cultures for DNA extraction and studies on the growth characteristics of this fungus. The mycelium was used for DNA extraction according to the method. The PCR reaction was performed using the ITS1 and ITS4 primer pairs (ITS1: 5&rsquo;-TCCGTAGGTGAACCTGCGG-3&rsquo;; ITS4: 5&rsquo;TCCTCCGCTTAT TGATAT GC-3&rsquo;), following the method described. The PCR products were analysed on agarose gel and then subsequently sequenced and were compared against gene sequences in the GenBank database using the BLAST tool. Mushrooms cellulase activities analysis by colorimetric method using dinitrosalicylic acid (DNS). 
 
Result:&nbsp;Research about the morphology, observe the basidiospores by microscopy and analysed the phylogeny based on ITS sequences and identified the fungus causing Delonix regia tree death disease distributed in Hue city as Ganoderma multipileum. The cellulase activity of Ganoderma multipileum mycelium reached a maximum value of 0,185 IU/mL after 5 days of culture at 35&deg;C.

Discovery of Ganoderma Species Associated with Dieback of the Delonix regia Trees

Background: The purpose of the study was to assess how effective the use of organic and liquid fertilizers derived from palm oil mill waste as an alternative to improve soil quality and control Ganoderma. 
 
Methods: In this study, the DEA Model was used to assess effectiveness, the TAM Model to assess technology acceptance and the ISM Model to analyze policies that support the management of palm oil mill waste into organic fertilizer. 
 
Result: The results showed that using organic fertilizer obtained from palm oil mill waste significantly improved soil quality. Compared with conventional methods, this treatment also succeeded in reducing the level of Ganoderma attacks by 40% and increasing production yields by 15%. 
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Discovery of Ganoderma Species Associated with Dieback of the Delonix regia Trees

Plantation Management Model with Utilization of Palm Oil Waste