Diversity of Flower–visiting Insects and Fruit Setting of Siamese Rosewood (Dalbergia cochinchinensis Pierre.) in Northeastern Forest Tree Seed Center, KhonKaen Province

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Panida Pechsuwan
Wattanachai Tasen
Chakrit Na Takuathung

Abstract

This study investigated the diversity of flower visitors and fruit settings of Siamese Rosewood (Dalbergia cochinchinensis Pierre.) in the Northeastern Forest Seed Center, Khon Kaen Province during May to December 2023. Insect visitors were collected using Air–flight Malaise traps and fruit setting rates were compared between the plantation and natural forest. A total of 3,313 individuals representing 177 species and 11 orders (Blattodea, Coleoptera, Diptera, Ephemeroptera, Hemiptera, Hymenoptera, Lepidoptera, Neuroptera, Odonata, Psocoptera and Thysanoptera) were collected. The highest number of species were from the Diptera order, followed by Lepidoptera, Coleoptera and Hymenoptera (36.36%, 17.61%, 15.91% and 15.34%), respectively. The ecological roles were classified into three groups, with the groups of insect pests (79 species) having a higher number of species compared to natural enemies’ insect (56 species), and pollinators (42 species). The highest fruit setting rate was recorded under open pollination in the natural forest (42.75 ± 1.06 %, n=12,046), while the lowest rate was observed under controlled pollination in the plantation (0.95 ± 0.69 %, n=7,487). Statistical analysis indicated a significant difference (F = 4.10; p<0.05) in fruit setting rate between the two treatments. The results indicate that the flowers of Siamese Rosewood require pollination by insects and other vectors to increase fruit setting.

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How to Cite
Pechsuwan, P. ., Tasen, W. ., & Na Takuathung, . C. . (2025). Diversity of Flower–visiting Insects and Fruit Setting of Siamese Rosewood (Dalbergia cochinchinensis Pierre.) in Northeastern Forest Tree Seed Center, KhonKaen Province. Thai Journal of Forestry, 44(2), 397–407. retrieved from https://li01.tci-thaijo.org/index.php/tjf/article/view/267380
Section
Original Articles

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