Fall Armyworm Spodoptera frugiperda (Lepidoptera: Noctuidae) is a new pest in Indonesia that attacks corn plants. S. frugiperda larvae damage by eating the leaves to the growing point which can result in yield loss from 55 to 100%. This pest reportedly attacked corn plantations at the beginning of 2019 then spread almost throughout Indonesia. This study aims to study the distribution and population dynamic of S. frugiperda in Yogyakarta, Indonesia. Preliminary research was conducted in Sleman and Bantul regency covering all district in these areas, then the research was continued in six corn fields in Bantul regency (Kasihan, Pajangan, Sedayu) district. The result show that the S. frugiperda has been spread throughout Bantul and Sleman District. The populations of S. frugiperda are different in each location, the density of each larvae ranged from 0-1 larvae per plant. Larvae population increased by increasing the age of plants. Mortality of S. frugiperda larvae found in the field was relatively low. Mortality is caused by fungal infections, entomopathogenic bacteria, parasitoid insect Tachinidae sp.1 and predatory insects Coccinella transversalis. The population rate was influenced by the internal factors of S. frugiperda itself that is the life cycle.
INTRODUCTIONSpodoptera spp. (Lepidoptera: Noctuidae) are the common pest of Indonesia including Spodoptera litura and S. exigua (Kalshoven, 1981). Spodoptera litura is the most voracious among the genus of Spodopotera which is commonly found in leguminous plants (Tengkano & Suharsono, 2005) and S. exigua is commonly found in onion and other 170 plant species (Zhang, Huai, Helen, & Wang, 2011). In the meantime, Spodoptera frugiperda is a newly reported pest species of Indonesia in 2019.
Ulat sutera merupakan serangga bernilai ekonomi tinggi. Kepompong ulat sutera dapat dijadikan bahan dasar pembuatan kain sutera dengan harga jual yang tinggi. Kelompok Usaha Jantra Mas Sejahtera (JAMTRA) merupakan kelompok usaha kain sutera yang melakukan usaha dari hulu ke hilir secara mandiri mulai dari pemeliharaan ulat sutera, pengolahan benang dan kain sutera, serta desain produk kain sutera. Dalam hal pemeliharaan ulat sutera, kelompok usaha JAMTRA mengahadapi permasalahan seperti kurangnya pemahaman mengenai cara memperbanyak serangga dengan baik, dan kurangnya pengetahuan mengenai pakan buatan untuk perbanyakan serangga. Kegiatan ini bertujuan meningkatkan pengetahuan peternak ulat sutera dalam memperbanyak serangga berdasar sifat ekologi serangga dan melatih peternak ulat sutera dalam membuat pakan buatan. Hasil kegiatan menunjukkan bahwa pakan berhasil digunakan bagi ulat sutera. Namun demikian, tidak ada kepompong yang terbentuk. Sehingga, kegiatan lanjutan diperlukan untuk memodifikasi komposisi pakan agar dapat digunakan dalam perbanyak ulat sutera secara maksimal.
Surjan and conventional rice fields are two rice farming systems grown in polyculture and monoculture. Differences in agricultural systems can affect insect diversity. This study aimed to determine the effect of the Surjan and conventional rice field ecosystems on the diversity and abundance of detritivores, pollinators, and neutral insects. The research was conducted in Panjatan District, Kulon Progo, Yogyakarta with a survey method in three areas of Surjan and conventional rice fields. Insect samples were collected using four kinds of sweeping net traps, yellow pan traps, yellow sticky traps, and pitfall traps. The results showed that there was no difference in the number of detritivores, pollinators, and neutral insect species in Surjan and conventional rice fields. Meanwhile, the abundance of detritivores, pollinators, and insects with other functions was higher in Surjan rice fields than in conventional rice fields. The results of the analysis of the similarity of structure and species composition of detritivores, pollinators, and insects with other functions show that the structure and composition of the detritivores, pollinators, and neutral insects in Surjan rice fields tend to be different from those in conventional rice fields. Surjan and conventional rice farming systems do not affect the number of detritivores, pollinators, and neutral insect species. However, the abundance of detritivores, pollinators, and neutral insect species in Surjan and conventional rice fields is different due to the differences in plant composition and structure in the two types of rice fields.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.