Abstract. Triyogo A, Budiadi, Widyastuti SM, Subrata SA, Budi SS. 2020. Abundance of ants (Hymenoptera: Formicidae) and the functional groups in two different habitats. Biodiversitas 21: 2079-2087. Land development often affects the quantity and diversity of ants (Hymenoptera: Formicidae). The aim of this study, therefore, was to determine and compare the ant species abundance and the functional groups between two different habitats, representing land development, including pioneer and agroforestry. This research involved a survey of the ants at the Forest Research Education (FRE) of Wanagama I Yogyakarta, and data were accumulated over a period of five months (April, May, June, July, and August). In addition, pit-fall trap and direct collection methods were used, involving the placement of 54 pit-fall traps at two habitats, and the ant specimens were retrieved after a two day period. The results show the total individual abundance of 2,310 and 2,067, on agroforestry and pioneer, respectively. Furthermore, the species richness and diversity index was higher in agroforestry (7; 2.01), compared with pioneer (6; 1.49), where the three dominant species include, Anoplolepis gracilipes, Solenopsis sp., Odontoponera denticulata; and Anoplolepis gracilipes, Odontoponera denticulata, Camponotus sp., respectively. Conversely, the highest amount of invasive ants (Solenopsis sp.) was observed in agroforestry, which negatively impacted on the presence of native species (Odontoponera denticulata). In addition, PCA analysis showed the development of three ant groups on each habitat, hence agroforestry made more real differences in the aspect of species abundance, and none in terms of richness. Therefore, notable differences were observed in the ant communities between both habitats, and agroforestry was indicated as a disturbed area, based on the increment in tramp and invasive ants, alongside low abundance of native and functional groups.

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KEYWORDS agroforestry teak insect trophic pest ABSTRACT Modifications of land use have the economic and ecological implications. Protection upon biodiversity has been the center of concern on ecological side, while productivity of the land use has been considered a solution for food security. Insects are between these two major issues, namely conservation and food security.This study was aimed at tracing the structure of insect community based on its role on the trophic level on three different phases of teak-based agroforestry systems (early, middle, and advanced). The data was obtained in the area of Nglanggeran, Gunungkidul Regency of Yogyakarta during the dry season (April, May, and June 2016). Further, method of insect sample inventory utilized sweep net, pitfall trap, and sticky trap placed on measured area of 20 x 20 m 2 . The plots were placed purposively on each of agroforestry land, with the total of 8 plots, consisting of 3 areas of early and middle levels of agroforestry land, and 2 for late phase. Catched insects varied according to agroforestry growth and observation time. This research suggests that insect's variety (abundance and morphospecies) is found based on agroforestry levels (early phase, middle phase and late phase) on observed teak agroforestry land in NglanggeranVillage of Batur Agung Zone, Gunungkidul. Early and middle agroforestry showed an abundance of insects (order), in which the largest proportion of them is categorized as pest (Lepidoptera, Diptera, Blattaria, Hymenoptera, Orthoptera, Coleoptera, Isoptera, and Dermaptera). The growth level of agroforestry has a direct impact on the presence of insects of Hymenoptera and Diptera orders. Furthermore, the variety of vegetation in early and middle agroforestry could increase the variety of insects functioning as either pest (trophic 2) or natural predators (trophic 3).

Abstract. Rahayu S, Triyogo A, Widyastuti SM, Musyafa’, Ardianyah F. 2021. Pests and diseases on Falcataria moluccana trees in agroforestry systems with pineapple in East Java, Indonesia. Biodiversitas 22: 2779-2788. The agroforestry system using Falcataria moluccana (Sengon) and Ananas comosus (pineapple) is considered as a profitable intercropping system in Indonesia. To make it viable, it is necessary to evaluate the effect of mixed cropping on the incidence and severity of diseases and pests on Sengon trees and apply management measures. The present study was conducted (i) to assess the pest and disease problems on Sengon trees in the agroforestry system and (ii) to identify the most harmful pathogen/pest which affects the growth and causes mortality of Sengon trees at the beginning of intercropping and after the removal of pineapple from the system.  Incidence of pests and diseases were assessed in 3 replicate blocks with one-year-old Sengon trees mixed with pineapple, and in another 3 plots with four-year-old Sengon trees from where pineapple was removed after harvesting. Sengon and pineapple were planted in the plots using alley cropping method with 3 x 4 m2 spacing. The results showed that there were no significant pest and disease problems on pineapple. However, Sengon was infested by the white grub Lepidiota stigma, gall rust caused by the fungus Uromycladium falcatarium, the stem borer Xystrocera festiva, and mistletoe Scurrula sp. However, stem borer and gall rust were the only pest and disease issues recorded in the monocultures of Sengon in Indonesia. The occurrence of stem borer and gall rust disease had a significant effect on the diameter growth of trees and in some instances, these caused mortality of one-year-old trees. Significant mortality of four-year-old trees was caused by mistletoe infestation only. Although the incidence of gall rust and stem borer in the agroforestry system was not significantly low compared to the monoculture, the former had wider spacing between trees, more open canopy and resultant low humidity and faster wind speed reduced the severity of the gall rust disease and stem borer attack. However, the intercropping resulted in the white grub attack on young Sengon trees which calls for application of contaminant-free fertilizers in pineapple plantings.