Suryantini R, Wulandari RS. 2018. Diversity of Ganoderma pathogen in Pontianak, West Kalimantan: Characteristics, virulence and ability to infect Acacia mangium seedlings. Biodiversitas 19: 465-471. The study aimed to determine morphological characteristics and virulence of Ganoderma isolates. The method that was used: isolation and characterization isolate from Acacia mangium, palm oil (Elaeis guineensis) and rubber (Hevea brasiliensis); inoculation of isolate in A. mangium; its influence to seedling dry weight. Results showed that isolated from A. mangium is G. lucidum, from palm oil is G. boninense and isolated from rubber plant is G. applanatum. Symptoms were observed within 3 months after inoculation. Symptoms began with chlorosis, necrosis and then seedling death. The G. lucidum is of highest virulent (2.08) compare to G. boninense (1.42). Whereas the one which isolated from rubber plant is moderately virulent (0.92). Ganoderma infection was indicated by decreasing the dry weight of infected seedlings. Difference type of isolates did not significantly effect to the decreasing of seedling dry weight 3.82 g (inoculated by G. lucidum), 4.01 g (inoculated by G. boninense), 5.02 g (inoculated by G. applanatum). These results showed that these isolates (especially G. lucidum-like) are species to watch out as for Ganoderma root rot pathogen. The presence of perennials such as palm oil and infected rubber, can be a potential source of inoculum for A. mangium.

Sengon (Paraserianthes falcataria) is a fast growing plant that has high economic value. But the presence of sengon in the wild every year begins to decline due to the high demand for sengon wood. To increase the availability of sengon seeds, the propagation is carried out through tissue culture techniques. This study aims to determine the correlation between growth regulators (IAA and BAP) and the growth of sengon explants. This study used an experimental method with treatment of IAA concentrations of 0 mg/L, 0,5 mg/L, 1 mg/L, 1,5 mg/L, and 2 mg/L and BAP concentrations of 0 mg/L, 1 mg/L, 2 mg/L, 3 mg/L and 4 mg/L. Each treatment was repeated three times and analyzed using a simple correlation test analysis. The results showed, that the higher concentration of IAA and BAP, causes decreased growth of sengon explants, so the concentration of IAA and BAP gives a negative correlation, but provides a strong relationship to the percentage days of appearance of roots, shoots and leaves, plantlet height, root length, and number of leaves.Keywords : Correlation, plant tissue isolation method, sengon.

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This study aims to obtain a description of the morphology and species names for fruit-producing trees. The method used is a survey with thorough observations in exploring the Tembawang forest. Observations were made by observing and identifying the morphological characteristics of fruit-producing trees. Based on the results of the study found 26 species of fruit-producing trees belonging to 14 types of families. The families are Anacardiaceae, Arecaceae, Ahariaceae, Burseraceae, Clusiaceae, Dipterocarpaceae, Fabaceae, Lauraceae, Malvaceae, Maliaceae, Moraceae, Oxalidaceae, Phyllanthaceae and Sapindaceae.Keywords: Fruit Trees, Identification, Tembawang Forest AbstrakPenelitian ini bertujuan untuk mendapatkan gambaran morfologi dan nama spesies pohon penghasil buah. Metode yang digunakan adalah eksplorasi hutan Tembawang. Pengamatan dilakukan dengan mengamati dan mengidentifikasi ciri-ciri morfologi pohon penghasil buah. Berdasarkan hasil penelitian ditemukan 26 jenis pohon buah-buahan yang tergolong dalam famili Anacardiaceae, Arecaceae, Ahariaceae, Burseraceae, Clusiaceae, Dipterocarpaceae, Fabaceae, Lauraceae, Malvaceae, Maliaceae, Moraceae, Oxalidaceae, Phyllanthaceae dan Sapindaceae.Kata Kunci: Pohon Buah-Buahan, Identifikasi, Hutan Tembawang

Mahogany (Swietenia macrophyla King) is a wood plant that has the potential to be developed in plantations. One of the factors that interfered in the development of mahogany was destructive insects. This study aimed to identify the species of destructive insects and calculate the level of damage to mahogany seedlings in the permanent nursery BPDASHL Kapuas Pontianak conducted by the survey method. Collecting insects on mahogany seedlings is identified by using insect nets and catching them directly by hand. Calculation of damage level is to use the criteria table and crop assessment category. The results showed that there were 4 species of insects which damaged the seedlings of mahogany in the nursery, namely Valanga nigricornis, Tagasta marginella, Anoplolepis longipes and Xyloxandrus sp. The number of seeds attacked as many 585 seeds from 2.176 seeds, with the level of damage to the entire pathway which is 12,39% and included in the category of minor damage. Keywords: Destructive insects, Identification, level of damage, mahogany seedlings, permanent nursery