Abstract. Ikhsan Z, Hidrayani, Yaherwandi, Hamid H. 2020. The diversity and abundance of Hymenoptera insects on tidal swamp rice field in Indragiri Hilir District, Indonesia. Biodiversitas 21: 1020-1026. Hymenoptera is one of the four largest insect orders and it plays a vital role in human life as pollinators, parasitoids, and predators. Hymenoptera parasitoids are particularly important as agents of biological control of pest. The objective of this research was to study the diversity and abundance of Hymenoptera on tidal swamp rice field in Indragiri Hilir District, Riau Province, Indonesia. Samplings were conducted in 3 sub-districts of rice production centers, namely Batang Tuaka, Keritang and Reteh, using four trapping techniques (i.e. insect net, malaise trap, pitfall trap, and yellow pan trap). Shannon diversity index (H '), Krebs evenness index (E), and Jaccard similarity index (Is) were calculated. We found 4,701 individuals consisting of 39 families and 319 species of Hymenoptera at the three studied areas. Tidal swamp rice in Indragiri Hilir District had a high species diversity of Hymenoptera parasitoids and Hymenoptera predators, but a moderate species diversity of Hymenoptera pollinators. Species diversity and evenness of Hymenoptera parasitoids and predators were higher in Keritang than in Batang Tuaka and Reteh. The families of Formicidae, Braconidae, Ichneumonidae, and Scelionidae had the highest number of species, while Formicidae, Scelionidae, Diapriidae, and Braconidae had the highest number of individuals. Based on these findings, the abundance and diversity of Hymenoptera insects in Indragiri Hilir District have the potentials to be developed as biological agents to control pests on tidal swamp rice in this area.

Hymenoptera parasitoids are potential as biological agents for controlling insect pests of rice plant. Diversity of hymenoptera parasitoids was studied in low and high land rice plant in west Sumatra. Objective of research was to obtain information about diversity and equity of hymenoptera parasitoids in ecosystem of low and high land rice. A survey was conducted using purposive random sampling. Collection of insects was done using insects net and yellow pan traps. The number of hymenoptera parasitoids found in rice plant in the lowland was 114 individuals which belonged to 10 families and 29 species, and in highland there were 112 individuals which belonged to 13 families and 31 species. Diversity and evenness index of hymenoptera parasitoid species were slightly higher in highland (3.198 and 0.922) compared to low land (3.029 and 0.890)

Rice (Oryza sativa L.) is one of the primary food crop commodities in Indonesia. The need for rice is always increasing every year, so efforts are needed to increase rice production. One of the things that can inhibit the rice production was weeds. The first step to control weed was identifying the type of weeds. This study aims was to identify the dominance of weeds found in tidal paddy fields in Indragiri Hilir Regency. The study was conducted on tidal land owned by farmers in Indragiri Hilir Regency, Riau Province. The study was conducted at four locations, namely in the districts of Batang Tuaka, Keritang, Reteh, and Tembilahan Hulu. The research was carried out using a survey and exploration methods. The results revealed that 12 families consisted of 20 species of weeds in the tidal land rice plantations of Indragiri downstream. Based on the Taxonomy, there are seven species of monocot weeds and 13 dicotyledons. Based on the morphology, there are 12 species of broadleaf weeds, five species of grasses weeds, two species of fern weeds, and one species of Cyperaceae weeds. Ageratum conyzoides and Imperata cylindrica species are the most dominant weeds in rice plantations with an SDR (Summed Dominance Ratio) of 9.57% each.

Indonesia has a high diversity of ant species, but much remains unreported. In agricultural habitats, ants can act as predators, decomposers, and bioindicators for agricultural ecosystems health. This research aimed to study the species diversity of Formicidae on tidal swamp rice fields in Indragiri Hilir District. Sampling was carried out in two periods of rice planting. Samples were conducted in 4 sub-districts of rice production centers, namely BatangTuaka, Keritang, Reteh, and Tembilahan Hulu, using four sampling techniques (i.e., insect net, malaise trap, yellow pan trap, and pitfall trap). Diversity index (H ), Species richness index (d), Species Evenness index (J), and Similarity Index (Is) were calculated. We found 5,754 individuals consisting of 5 subfamilies and 43 species of Formicidae at the four studied areas. Subfamily Myrmicinaehas the highest individual abundance, 2.578 individuals, followed by subfamily Formicinae1.823 individuals, subfamily Ponerinae 776 individuals, subfamily Dolichoderinae 575 individuals, and subfamily Pseudomyrmecinae 2 individuals. Diversity of plant species and environmental factors can affect the diversity index, species abundance, and abundance of individual Ants.

Land conditions in Sungkai, Padang City, have slopes and high rainfall. The causes low water absorption capacity. For this reason, it is necessary to plant plants that can help increase water absorption, one of which is bamboo plants. This activity was carried out on November 6, 2021, to empower the community of farmer groups in the Andalas University campus with a focus group discussion on agricultural issues and planting bamboo trees. The activity consists of four stages: preparation, counselling/socialization, focus group discussion, and field practice. There are five main problems to solve. The issues found are 1) how to handle flooding in the river; 2) how to control plant-disturbing organisms without using chemicals; 3) new land clearing methods so as not to damage the environment; 4) how to obtain and treat good seeds and seedlings before planting, and 5) farmer group dynamics and their resolution. Planting bamboo is one of the steps to deal with the problem of flooding. Bamboo has a very tight, broad, and strong root system to strengthen the soil structure and withstand water runoff. Bamboo plants can also become new hosts of pests that damage cultivated plants. The service team synergizes with extension workers to understand bamboo, which can be an alternative in sustainably conserving soil and water.

Nagari Sungai Dareh Kecamatan Pulau Punjung Kabupaten Dharmasraya merupakan kawasan yang terletak di tepi Sungai Batang Hari. Sungai harus dilindungi dan dipelihara kelestariannya serta ditingkatkan fungsi dan manfaatnya guna kesehatan dan keberlanjutan ekosistem. Penanaman aren di bantaran sungai merupakan salah satu cara yang dapat dilakukan untuk menjaga kelestarian sungai. Selain bermanfaat untuk konservasi, aren juga memiliki nilai ekonomis yang tinggi. Kegiatan ini bertujuan untuk pemberdayaan masyarakat dengan cara: 1) Kegiatan konservasi di bantaran sungai Batang Hari, dan 2) Pengenalan tanaman aren serta meningkatkan pengetahuan dan keterampilan masyarakat dalam hal budidaya aren. Kegiatan ini dilaksanakan di Jorong Sungai Kilangan Nagari Sungai Dareh Kabupaten Dharmasraya dengan metode ceramah, diskusi dan demonstrasi penanaman aren di bantaran sungai. Jumlah mahasiswa yang dilibatkan adalah sebanyak lima orang. Masyarakat Nagari Sungai Dareh sangat antusias mendengarkan dan berdiskusi tentang budidaya aren dan pentingnya melakukan konservasi sungai. Kebanyakan peserta sangat tertarik dan akan langsung menanam aren pada lahan mereka masing-masing, namun masih ada beberapa yang masih akan mempelajari lebih lanjut. Sebagai bentuk harapan kami agar penanaman aren di bantaran sungai dapat sukses, maka kami memberikan bantuan ±200 bibit aren untuk masyarakat Nagari Sungai Dareh. Pemberdayaan masyarakat melalui budidaya aren telah mampu meningkatkan pengetahuan dan keterampilan masyarakat tentang pentingnya menjaga kelestarian sungai serta prospek dan tantangan budidaya tanaman aren

Pests are one of constrains in cassava production. The research was done in cassava plantation in Lima Puluh Kota with the objectives were to determine the species of major pests of cassava and their damages. A survey was conducted in five subdistricts, Akabiluru, Guguak, Harau, Lareh Sago Halaban and Situjuah Limo Nagari. Twenty sampled plants were taken in 400 m 2 plot laying in the middle of 0,5 hectar cassava plantation, 4-5 months. Four species of pests were found to attack cassava plants in Lima Puluh i.e: Paracoccus marginatus, Pseudococcus jackbeardsleyi, and Ferrisia virgata, whitefly, Aleurodicus dispersus. The three mealybugs caused percentage of plant attacked 85.5 %, percentage of leaf plant attacked 8.61 %, pest population 52.29 individual per plant with damage intensity was high. Whitefly caused percentage of plant attacked 12%, percentage of leaf plants attacked 0.77%, pest population 1.51 individual per plant.

One of the things that can be done to increase production in Galo-Galo beekeeping is to plant flowering vegetation around the cultivation location. Some flower plants that are good for planting are Mexican Creeper, Xanthostemon, and Calliandra. These three plants can attract Galo-Galo honey bees to increase honey production. They will be able to improve the farmer's economy in Sungkai, Lambung Bukik Village, and Pauh Padang District. This community service activity aimed to provide understanding and flowering plant seeds to increase the production of Galo-Galo bee honey. The method used was counselling and practice. Planting flower vegetation was carried out in practice directly at the farm location. The activity resulted in 1) Increased partners' knowledge, interest, and skills in breeding Galo-Galo integrated with flowering vegetation. 2) Partners know and can increase the productivity of Galo-Galo bee honey. The activity ran smoothly, and the activity target was appropriately achieved. Farmers participating in the service have been able to cultivate stingless bees and optimize production by planting flowering vegetation.