Estimation of the Recent Expansion Rate of Ruspolia nitidula (Orthoptera) on a Regional and Landscape Scale

Recent changes in insect distribution are consistent with the expected interacting effects of climate and habitat change. The orthopteran Ruspolia nitidula has expanded its area of distribution in Western and Central Europe in recent decades. Because males emit a sound that is easily detected at a distance of up to 40 m, it is possible to detect spreading individuals and to therefore document routes and rates of spread. Using occurrence data at the landscape scale and three methods, including least-cost path analysis with habitat suitability, we estimated the R. nitidula expansion rate from 2006 to 2020 in the Czech Republic; this involved estimating distances between two origin occurrences in 2006 and two occurrences on the area margin in 2020. For comparison, we directly monitored expansion based on detection of singing males at the regional scale at the areal margin in the Odra River basin (2016–2020). The estimated maximum expansion rate ranged from 13.8 to 16.2 km/year based on occurrence data at the landscape scale and from 11.1 to 11.7 km/year based on the monitoring of males in the Odra River basin. To our knowledge, this is the first report of the direct monitoring of individual spreading males to detect changes in the distribution of an orthopteran.

Distribusi Temporal Populasi Serangga pada Tanaman Padi (Oryza sativa) di Unit Pelaksana Teknis Pengembangan Benih Palawija Singosari Malang

The rice plant (Oryza sativa.) is an important food crop which is a staple food for more than half of the world's population because it contains nutrients that the body needs. Rice production in East Java in 2011 experienced a significant decline in production i.e. 9.2% and declined again in 2013 (1.2%) with an average productivity (5.9) 1. Problems in agriculture are inseparable from the role of insects as pests. Decrease in production can occur due to insect pests. The purpose of this study was to identify the types of insects on rice fields, to find out the number of insects found based on the temporal distribution of rice fields in Technical implementation unit of Palawija Seed Development of Singosari, Malang, Research has been conducted on the temporal distribution of insect populations on rice plants by using temporal replication or time in three time periods, namely morning period (06.00-09.00), morning-noon (09.00-12.00), and afternoon (13.00-16.00). The observation parameters were done to measure abiotic factors including: temperature, humidity, wind speed, and light intensity and biotic factor measurements; insect identification, insect status determination, and insect distribution. The results of the identification of insects found there were nine species, seven kinds of families, and five orders of insects that had different statuses including predators and pests. The nine insects species include Agriocnemis pygmae, Diplacodes trivialis, Crocothermis servilia, Menochilus sexmaculata, Oxya chinensis, Valanga nigricornis, Schirpophaga innotata, Junonia almana, Zelus luridus. There are the effect of abiotic factors on the number of insects. Keywords: rice (Oryza sativa), insect population, insect status. ABSTRAK Tanaman padi (Oryza sativa) merupakan tanaman penting yang menjadi makanan pokok lebih dari setengah penduduk dunia karena mengandung nutrisi yang diperlukan tubuh. Produksi padi di Jawa Timur pada tahun 2011 terjadi penurunan produksi yang cukup signifikan yaitu 9,2% dan kembali menurun pada tahun 2013 (1,2%) dengan rata-rata produktivitas (5,9)-1. Permasalahan di bidang pertanian tidak terlepas dari peran serangga sebagai hama. Penurunan produksi dapat terjadi karena serangga hama. Tujuan penelitian ini adalah untuk mengidentifikasi macam-macam serangga pada lahan tanaman padi, mengetahui jumlah serangga yang ditemukan berdasarkan distribusi temporal pada lahan tanaman padi di Unit Pelaksana Teknis (UPT) Pengembangan Benih Palawija Singosari Malang. Ulangan waktu pada tiga periode waktu yaitu Periode pagi (06.00-09.00), Siang (09.00-12.00), dan sore (13.00-16.00). Parameter pengamatan dilakukan pengukuran factor abiotik meliputi suhu, kelembaban, kecepatan angin, dan intensitas cahaya dan pengukuran factor biotik meliputi identifikasi serangga, penentuan status serangga, dan distribusi serangga. Hasil identifikasi serangga ditemukan ada sembilan macam spesies serangga, tujuh macam familia, dan lima ordo serangga yang memiliki status yang berbeda meliputi predator dan hama. Sembilan species serangga tersebut meliputi Agriocnemis pygmae, Diplocodes trivialis, Crocothermis servilia, Menochilus sexmaculata, Oxya chinensis, Valanga nigricornis, Schirpophaga innotata, Junonia almana, Zelus luridus. Terdapat hubungan antara factor abiotik kecepatan angin terhadap jumlah serangga. Kata Kunci: padi (Oryza sativa), populasi serangga, status serangga.

Photoperiod-Specific Within-Plant Distribution of the Green Stink Bug (Hemiptera: Pentatomidae) on Cotton

Sampling methods for detecting stink bugs are intensive, time-consuming, and yield variable results. In a 2-yr mark-release-observe experiment, over 500 adult green stink bugs, Chinavia hilaris (Say) (Hemiptera: Pentatomidae), were used to test for variation in nocturnal and diurnal insect distribution patterns on cotton. Field-collected stink bugs were marked or unmarked with nontoxic fluorescent sharpie markers, released, and monitored in cotton fields at peak bloom. Stink bugs were monitored visually during day and night, aided by a handheld blacklight for nighttime observations. Within-cotton distribution insect observations were categorized by plant section (i.e., bottom, middle, and top branches), by fruiting positions and leaf surface, and by concealed or exposed orientation on floral bracts and leaf surfaces. Green stink bugs were primarily distributed on the middle and top branches irrespective of photoperiod, and on bolls in first position from the main stem. Differences in stink bugs observed concealed or exposed on fruiting structures were detected. During daytime, stink bugs were primarily observed inside the bract of bolls, and when detected on leaves concealed on the lower surface. In contrast, stink bugs were primarily outside the bract of bolls at night, and when detected on leaves were exposed on an upper surface. These results support focus on assessing internal boll injury for evaluating stink bug injury to avoid the challenges in stink bug detection observed here, and point to additional study to refine stink bug density estimation when needed.

Distribusi Dan Diversitas Serangga Tanah Di Taman Hutan Raya Gunung Tumpa Sulawesi Utara

Serangga tanah merupakan jenis dari serangga yang seluruh atau sebagian hidupnya berada di tanah. Serangga tanah berperan penting dalam ekosistem yaitu membantu proses pelapukan bahan organik dan keberadaan serta aktivitasnya berpengaruh positif terhadap sifat kimia fisik tanah. Penelitian ini bertujuan untuk mengkaji distribusi dan diversitas serangga tanah di Gunung Tumpa, Sulawesi Utara. Lokasi pengambilan sampel terdiri dari tiga tipe habitat yaitu, hutan primer, hutan sekunder dan lahan perkebunan. Teknik pengambilan sampel menggunakan perangkap sumuran (Pitfall trap). Hasil penelitian ditemukan serangga tanah sebanyak 10 ordo, 23 famili, 28 genus, 33 morfospesies dan 21100 individu. Ordo Hymenoptera didominasi oleh famili Formicidae. Pola distribusi serangga tanah di Gunung Tumpa berkelompok. Indeks diversitas spesies di Gunung Tumpa tergolong sedang (H = 2,62). Kelimpahan spesies dan indeks diversitas spesies serangga tanah tertinggi ditemukan pada hutan primer, sedangkan yang terendah pada lahan perkebunan dan hutan sekunder.Soil Insects is a type of insect that all or part of his life was on the ground. Soil insects plays an important role in the ecosystem that is helping the process of weathering and the presence of organic matter as well as its activities towards the positive effect of physical chemical properties of the soil. This research aims to identify, examine the distribution and diversity of insects land on Mount Tumpa, North Sulawesi. Location of sampling consists of three types of habitat i.e., primary forest, secondary forest and plantations. The technique of sampling using Pitfall trap. Results of the study found as many as 10 soil insect orders, 23 families, 28 genera, 33 morfospesies and 21100 individuals. The order of Hymenoptera is dominated by the Formicidae. The pattern of soil insect distribution in Gunung Tumpa is clumped. Index of species diversity in Mt. Tumpa belongs to moderate (H = 2.62). The highest abudance and diversity index of soil insect species were found in primary forest, while the lowest was on plantation and secondary forest.

Another climate change induced infiltration? The northernmost record of thermophilous spore-feeding Allothrips pillichellus (Thysanoptera: Phlaeothripidae: Idolothripinae)

Environmental factors related to climate change can directly influence the spatial patterns of insect distribution, including many “southern” elements in mild climate ecosystems. This paper deals with potential infiltration of thermophilous