Nanette Hope N Sumaya

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Verified

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• PhD
• Associate Professor at Mindanao State University – Iligan Institute of Technology

Cabbage Fusarium Wilt (CFW), caused by Fusarium oxysporum f. sp. conglutinans (FOC), is a major disease of cabbage and other Brassica crops that can lead to severe yield losses when mismanaged. In the quest for finding novel biocontrol agents for the management of CFW, we screened potential endophytic fungi (EF) isolated from selected plants. A com...

Entomopathogenic nematodes (EPNs) of the genera Heterorhabditis and Steinernema are widely used as biological control agents (BCAs) against agricultural insect pests. Recently, nematodes from the genus Oscheius have shown potential as candidates for biological control agents. In this study, two nematode populations from the agricultural fields in B...

Aim of study: Urea remains one of the most widely used chemical fertilisers in the world and is used extensively in the Philippines as a major source of nitrogen for crops. However, we have a very limited understanding of its impact on soil fauna such as nematodes. In this study, we demonstrated the suitability of the microcosm set-up to assess che...

Tañan VB, Sumaya NHN. 2024. Bio-inventory of terrestrial gastropod species in Northern Mindanao, Philippines. Biodiversitas 25: 3391-3402. Gastropods are the largest class in the phylum Mollusca, with an estimated 70,000 to 76,000 species. The prevalence of gastropods is undeniable evidence of their successful adaptation to various habitats, includ...

Background The Sto. Niño site in Benguet province, Philippines was once a mining area that has now been transformed into an agricultural land. In this area, there has been significant integration of the three indigenous people (IPs) Ibaloi, Kankanaeys and Kalanguyas with the Ilocano community. These IPs safeguard biodiversity and traditional knowle...

The cosmopolitan terrestrial slug, Deroceras laeve (O. F. Müller, 1774), is reported in the Philippines for the first time and characterized through morphology, morphometrics, and cytochrome oxidase subunit I (COI) gene analysis. Slug samples were recovered from two administrative regions in Mindanao, Philippines. In Region X, there were two sites:...

Dalan L, Tañan V, Diano MA, Demayo C, Tabelin M, Sumaya NH. 2024. Life history traits of the gastropod-associated bacterivorous nematode Caenorhabditis brenneri (Nematoda: Rhabditida). Biodiversitas 25: 3106-3113. Caenorhabditis species are associated with decaying plant materials and invertebrates such as terrestrial gastropods. Few Caenorhabditis...

The common cutworm, Spodoptera litura , is a serious insect pest of many vegetables and crops worldwide. Entomopathogenic nematodes (EPN) have been utilized as biological control agents for controlling various insect pests, including the larvae of S. litura . Many indigenous EPN have been recognized to be more effective in specific field applicatio...

Entomopathogenic fungi (EPF) are used as a sustainable substitute for chemical insecticides and have been recognized as effective biocontrol agents for mitigating insect pest populations. In this study, a naturally-occurring beneficial EPF, Purpureocillium lilacinum CBBS3.12 (Hypocreales: Ophiocordycipitaceae) from a cabbage farm was isolated and i...

Mining is notorious for contaminating the environment with heavy metals, disrupting the activities of soil fauna such as nematodes, and causing changes in the functions of organisms in the soil ecosystem. This study investigated the survival, reproduction, and typical life history traits (LHTs) of free-living nematodes collected from an artisanal a...

Numerous nematodes in the genus Oscheius possess entomopathogenic abilities. These nematodes also kill their insect hosts by releasing their symbiotic bacteria within 48–72 h. In this study, 12 indigenous isolates of Oscheius myriophilus based on molecular, morphological, and morphometric studies were recovered from different undisturbed soils in T...

Environmental DNA (eDNA) metabarcoding and fish visual census reveals the first record of Doboatherina magnidentata in the Philippines. Biodiversitas 24: 3063-3072. Biodiversity monitoring is the cornerstone for conserving marine fish species. However, classical methods, like the Fish Visual Census (FVC), are often limited due to sampling difficult...

Herein, we first report the comprehensive description of the terrestrial slug, Sarasinula plebeia (Gastropoda: Veronicellidae) by employing morphology, morpho-taxometrics and molecular analysis. A rapid survey on terrestrial slug invasive alien species (IAS) was conducted in La Dicha, Malangas, Zamboanga Sibugay, the Philippines. Obtained COI gene...

at 15 °C, 25 °C or 30 °C for two weeks, indicating their potential to remain viable under field conditions. However, the mean LD 50 value ranged from 35 to 150 and was generally lower at 15 °C than at 25 °C and 30 °C. Similarly, after IJs had been kept at 25 °C for 1-3 weeks without insect hosts, all isolates infected B. tryoni larvae, with mean LD...

The increasing need to reduce chemical pesticide use has driven the interest in exploiting entomopathogenic and entomophilic nematodes (EPNs) as biological control agents (BCA) against several economically important agricultural pests. This study aimed at investigating the diversity, distribution and biocontrol potential of locally isolated nematod...

Entomopathogenic fungi (EPF), a very diverse group of fungal species is currently used worldwide as biocontrol against wide range of insect pests along with its multiple potential benefits in agricultural practices. This study aims to assess the locally-isolated entomopathogenic fungi against Zophobas morio as a preliminary bioassay and to assess t...

Gastropod-associated nematodes have been previously studied and documented worldwide, with some species forming host-specific association as obligate parasites of molluscs while others form intermediate and temporary association. Philippinella moellendorffi from Imelda, Zamboanga Sibugay, Philippines, were collected, washed and maintained in the la...

Background Entomopathogenic nematodes of the genera Heterorhabditis and Steinernema are widely used as biocontrol agents against diverse insect pests. Their association with symbiont bacteria is found to be the primary cause of insect mortality. The present study reported a comprehensive characterization of a local Philippine EPN isolate using cong...

Entomopathogenic nematodes (EPNs) are used as biocontrol agents of diverse insect pests. EPN diversity study was conducted in the southern Philippines (Cotabato province), encompassing a total of 5 municipalities with 25 Barangays (villages) for the potential biocontrol of the sugarcane white grub, Leucopholis irrorata. Of the 25 soil samples colle...

Background: Trichoderma asperellum (Ascomycota: Hypocreaceae) is a globally recognized soil fungus due to its broad-spectrum antimicrobial and plant growth-promoting properties. To increase the availability of local strains, soil samples from a dragon fruit farm in Villanueva (Misamis Oriental, Philippines) were collected and baited using the insec...

Queensland fruit fly (Bactrocera tryoni) is Australia’s most significant horticultural pest, yet limited options are available for its biological control. Here, we assessed the virulence and reproductive potential of 32 newly isolated Australian entomopathogenic nematode (EPN) strains of Heterorhabditis bacteriophora, Heterorhabditis indica, Hetero...

Gastropods are extremely diverse taxa comprising nearly 60,000 species, of which, the giant African land snail, Achatina fulica is a well-known member. It is an invasive species, and it serves as vector and host for several free-living and parasitic nematodes. This makes studies on the diversity of nematodes isolated from gastropods be more emphasi...

Entomopathogenic nematodes (EPNs) are used in biological control of pest insects but their potential may be limited by strain availability from different bioregions and effectiveness against specific pests. Here, we isolated and characterized EPNs and their symbiotic bacteria from Australia where their diversity is scarcely known. We collected 198...

Background The tobacco cutworm, Spodoptera litura [Fab.] (Lepidoptera: Noctuidae), is a devastating insect pest of several crops. Entomopathogenic nematodes (EPNs) of the families Heterorhabditidae and Steinernematidae are used as an alternative control measure in lieu of the hazardous synthetic chemical applications. Results A survey of naturally...

Background Entomopathogenic nematodes (EPNs) of the families Heterorhabditidae and Steinernematidae are used as biological control agents of several insect pests in lieu of synthetic pesticides. Results Using an insect-baiting technique, naturally occurring EPN isolates were collected from banana and rice fields in the municipality of Hagonoy, the...

The entomopathogenic nematode (EPN) Heterorhabditis bacteriophora is used as a biological control agent against diverse insect pests. Nematode-based products contain third-stage Dauer juveniles (DJ), which are adapted to long-term survival. Their longevity can be limited by stress conditions during industrial production up to field application. Oxi...

The increasing need to reduce synthetic pesticide applications has driven the interest in utilizing entomopathogenic nematodes (EPNs) as biocontrol agents against agricultural pests. Unlike the former, EPNs are non-polluting, non-toxic and safe for the environment and the user. The vast diversity of naturally-occurring EPN populations in the Philip...

The entomopathogenic nematode-“bacterium complex Heterorhabditis bacteriophora-Photorhabdus luminescens is one of the most widely used biological control agents against several insect pests. The dauer juveniles (DJs) are third stage non-feeding and infective juveniles, which carry the symbiotic bacteria, survive in the soil to search for and penetr...

Poor shelf-life and sensitivity to environmental stress of entomopathogenic nematodes (EPNs) are traits, which deserve attention for improvement. Recently, a strong positive correlation between oxidative stress tolerance and longevity of Heterorhabditis bacteriophora dauer juveniles (DJs) has been reported. In this study, the improvement of H. bact...

Heth konoplevi n. sp. and Heth initiensis n. sp. are described from an unidentified spirobolid (Rhinocricidae) millipede collected at Mindanao Island, the Philippines. Females of H. konoplevi n. sp. are characterised by the absence of lateral cuticular lappets and the arrangement of lateral spines with an unpaired one in mid-lateral position that b...

The commercial use of the entomopathogenic nematode Heterorhabditis bacteriophora as a biocontrol agent against noxious insects is limited due to its relatively short shelf-life. Longevity of dauer juveniles (DJ) during storage and in transit to end users is considerably restricted by environmental stresses. As a derivative stress triggered by envi...

Keywords: Reactive oxygen species, nematode shelf life, extended life span The nematode-bacterium association between Heterorhabditis bacteriophora and Photorhabdus luminescens is a safe control agent against insect pests. H. bacteriophora infective dauer juveniles (DJs) survive on the soil after application and seek for insect hosts. However, limi...

Keywords: Reactive oxygen species, nematode shelf life, extended life span The nematode-bacterium association between Heterorhabditis bacteriophora and Photorhabdus luminescens is a safe control agent against insect pests. H. bacteriophora infective dauer juveniles (DJs) survive on the soil after application and seek for insect hosts. However, limi...

The Western Corn Rootworm (Diabrotica virgifera virgifera) is one of the most damaging maize pests worldwide. Most European farmers relied on the application of granular soil insecticides and/or chemical seed treatments for several years to counteract this pest. However, serious side effects on honeybees and other beneficial soil organisms stressed...

The nematode-bacterium complex Heterorhabditis bacteriophora and Photorhabdus luminescens is a safe control agent against insect pests. H. bacteriophora infective dauer juveniles (DJs) survive in the soil after application and seek for insect hosts. For industrial production, DJs are propagated in bioreactors in large volumes (up to 40 m3). Thereaf...

A new species of the genus Synoecnema-S. watinagii sp. n.-is described and illustrated. The species is characterized by its small size, lack of sexual dimorphism apart from sexual characters, males with pericloacal disk, females with anterior vulva position and lacking an anus, and similar caudal organs in both sexes in the shape of long, deep slit...

The commercial production of the entomopathogenic nematode (EPN) Heterorhabditis bacteriophora as a biocontrol agent is limited due to its relatively short life-span. Longevity of Infective juveniles (IJs) during storage and in-transit to end users is drastically limiting its application. IJs longevity is influenced by factors like temperature, des...

ON THE DIVERSITY OF NEMATODES PARASITIC IN INVERTEBRATES OF MINDANAO ISLAND, PHILIPPINES. Ivanova1, E.S., N.H.N. Sumaya2, A.B. Mohagan3 and S.E. Spiridonov1.1A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii pr., 33, Moscow, 119071, Russia; 2Biology Department, Mindanao State University-Iligan Institute of te...

An ethnomedicinal study was conducted in the three (3) Barangays of Dumingag, Z amboanga del Sur, Philippines using a snowball method. Data were gathered through a series of informal interviews, semistructured questionnaire and discussion among the nine (9) respondents of each sampling area. Sixty (60) medicinal plant species were recorded belongin...

A descriptive study documenting the common medicinal and ritual plants of tribal communities in Sitio Sinaburan, Barangay Imbayao, Malaybalay City, Bukidnon, Philippines has been conducted. Three tribal herbalists belonging to the following tribal groups: Talaandig, Higaonon, and Bukidnon were primarily interviewed using a semi-structured questionn...

The entomopathogenic nematode (EPN) Heterorhabditis bacteriophora is used in biological plant protection to control pest insects. In the past, several attempts targeted at an enhancement of the desiccation tolerance of EPN by genetic selection in order to improve their storage stability. The subsequent loss of improved beneficial traits after relea...

Entomopathogenic nematodes (EPNs) suffer from trait deterioration, a potential problem when these antagonists are transferred into artificial environments for mass production. In order to improve beneficial traits of EPN genetic selection and hybridization has been successfully carried out. Should these selected strains deteriorate during serial cu...

Nematodes may contribute to the decomposition of detritus in both aquatic and terrestrial ecosystems. In aquatic sediments, the most prominent role is expected for bacterial-feeding nematodes, since these may in several ways affect the activity and abundance of bacteria, the principal decomposers of organic matter. However, many free-living nematod...