Evaluation of two native entomopathogenic nematodes against Odontotermes obesus (Rambur) (Isoptera: Termitidae) and Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae)

Abstract Background Entomopathogenic nematodes (EPNs) are one of the widely studied biological control agents. The present study was conducted to evaluate the efficacy of two EPNs species, Heterorhabditis bacteriophora (Poinar) (Rhabditida: Heterorhabditidae) and Steinernema aciari (Qui, Yan, Zhou, Nguyen and Pang) (Rhabditida: Steinernematidae), isolated locally from soils of Majuli river island, Assam, India against two important subterrenean pests; Odontotermes obesus (Rambur) (Isoptera: Termitidae) and Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae) under laboratory conditions. Results In case of O. obesus, mortality percent was recorded by H. bacteriophora after 72 h. at 300 IJs/termite and by S. aciari at 250 and 300 IJs/termite after 96 h. The lowest LD50 and LT50 values obtained for H. bacteriophora were 13.054 IJs/termite and 26.639 h., respectively, while those of S. aciari were 42.040 IJs/termite and 31.761 h., respectively. With respect to A. ipsilon, H. bacteriophora registered a highest mortality rate at 300 IJs/larvae after 144 h. S. aciari showed 100 percent mortality at 300 IJs/larva after 168 h. The lowest values of LD50 and LT50 for H. bacteriophora were 35.711 IJs/larva and 83.050 h., respectively. The lowest values of LD50 and LT50 for S. aciari were 71.192 IJs/larvae and 97.921 h., respectively. Overall, H. bacteriophora displayed more virulence toward O. obesus and A. ipsilon than S. aciari. Conclusion Both native EPNs were found effective against O. obesus and A. ipsilon. However, H. bacteriophora was more virulent toward O. obesus and A. ipsilon than S. aciari under the laboratory conditions.

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Virulence of Native and Exotic Entomopathogenic Nematodes (Rhabditida: Steinerematidae, Heterorhabditidae) Against Larvae of the Agave Weevil, Scyphophorus acupunctatus (Coleoptera: Curculionidae)

HortScience ◽

10.21273/hortsci.39.4.832a ◽

2004 ◽

Vol 39 (4) ◽

pp. 832A-832 ◽

Cited By ~ 1

Author(s):

Jaime Molina-Ochoa* ◽

Eva Judith Hueso-Guerrero ◽

Roberto Lezama-Gutiérrez ◽

Javier Farías-Larios ◽

Francisco Radillo-Juárez ◽

...

Keyword(s):

Biological Control ◽

Entomopathogenic Nematodes ◽

Petri Dish ◽

Heterorhabditis Bacteriophora ◽

Steinernema Carpocapsae ◽

Agave Tequilana ◽

Biological Control Agents ◽

Laboratory Conditions ◽

Cryptic Habitats ◽

Mexican Strains

The agave weevil (Scyphophorus acupunctatus Gyllenhal) (AW) is widely distributed and is severe pest of plants in the Order Liliales, Familiy Agavaceae, such as Agave tequilana, A. fourcroydes, A. sisalana, A. sp., Polianthes tuberosa, and Yucca sp. Some of these species have importance as ornamental, medicinal, fragrant essence, and raw fiber. AW is controlled with insecticides, but insecticides are unable to reach the larvae in the galleries where the larvae borrows the agave crowns. Galleries are cryptic habitats where the entomopathogenic nematodes are able to infect instars of the AW. Recently, Hueso-Guerrero, and Molina-Ochoa (2004) reported the occurrence of native steinernematid nematodes naturally infecting the AW larvae. Virulence of isolates and strains of steinernematid and heterorhabditid nematodes against AW larvae was determined under laboratory conditions. Three native steinernematid isolates obtained from naturally infected AW larvae (A1, A2, and A3) were bioassayed a concentration of 100 nematodes/mL and petri dish (60 × 10 mm) arenas. Native isolates were isolated from AW larvae attacking agave crowns. Other strains evaluated were: S. carpocapsae All and Mexican, S. riobrave, and Heterorhabditis bacteriophora NC2. Native steinernematid isolates caused 100% mortality, however exotic strains caused mortality ranges between 90%, and 40%. Steinernema carpocapsae All strain, S. riobrave, H. bacteriophora NC2, and S. carpocapsae Mexican strains caused 90%, 60%, 50%, and 40% mortality, respectively. Results suggest that native steinernematid isolates, and S. carpocapsae All strain have potential as biological control agents against the AW weevil.

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Entomopathogenic Nematodes as Potential Biological Control Agents of Subterranean Termite, Microcerotermes diversus (Blattodea: Termitidae) in Iraq

Environmental Entomology ◽

10.1093/ee/nvaa014 ◽

2020 ◽

Vol 49 (2) ◽

pp. 412-421 ◽

Cited By ~ 1

Author(s):

Jawad B Al-Zaidawi ◽

Javad Karimi ◽

Esmat Mahdikhani Moghadam

Keyword(s):

Biological Control ◽

Entomopathogenic Nematodes ◽

Control Program ◽

Heterorhabditis Bacteriophora ◽

Subterranean Termite ◽

Biological Traits ◽

Biological Control Agents ◽

Significant Difference ◽

Field Efficacy ◽

Percent Mortality

Abstract The infectivity of three species of entomopathogenic nematodes (EPNs) such as Steinernema carpocapsae Weiser (Rhabditida: Steinernematidae), Heterorhabditis bacteriophora Poinar (Rhabditida: Heterorhabditidae), and H. bacteriophora Poinar (IRQ.1 strain) were examined against subterranean termite Microcerotermes diversus (Silvestri) (Blattodea: Termitidae) that is the most economically destructive termite in Iraq. Laboratory and field efficacy of these strains were evaluated to test the feasibility of indigenous EPNs to be used in a biological control program. The biological traits examined included pathogenicity, penetration, and reproduction of EPN species. Filter paper and wood bioassays were conducted using six concentrations: 25, 50, 100, 200, 400, and 600 IJs/termite. In both tests, all strains were virulent against M. diversus workers. The LC50 of S. carpocapsae in both petri dishes and in containers with sawdust was (57.9 and 15.7 IJs/termite) less than both indigenous (274.2 and 60.8 IJs/termite) and commercial (139.6 and 52.6 IJs/termite) Heterorhabditis bacteriophora, respectively. In the field, the percent mortality of the tested workers ranged from 22.5–80 ± 8.3%, 37.5–96.2 ± 8.9%, and 28.7–67.5 ± 6.8% for commercial H. bacteriophora and S. carpocapsae and native H. bacteriophora, respectively. All EPN strains successfully penetrated the M. diversus workers under field conditions, while the results showed that there was a significant difference between the three EPN strains. The percent mortality caused by native H. bacteriophora against termites was higher (43.6 ± 2.7%) than both commercial strains of S. carpocapsae (36.9 ± 1.6%) and H. bacteriophora (29.9 ± 1.4 %). These results highlight the efficiency of EPNs for the control of M. diversus workers.

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Canadian entomopathogenic nematode isolates: virulence against black cutworm (Lepidoptera: Noctuidae)

Phytoprotection ◽

10.7202/1018982ar ◽

2013 ◽

Vol 93 (1) ◽

pp. 43-46 ◽

Cited By ~ 5

Author(s):

Guy Bélair ◽

Louis Simard ◽

Julie Dionne

Keyword(s):

Entomopathogenic Nematodes ◽

Entomopathogenic Nematode ◽

Steinernema Carpocapsae ◽

Agrotis Ipsilon ◽

Black Cutworm ◽

Laboratory Conditions ◽

Lepidoptera Noctuidae

The virulence of ten indigenous and two commercial isolates of entomopathogenic nematodes against the black cutworm, Agrotis ipsilon, was assessed under laboratory conditions. When comparing commercial isolates, Steinernema carpocapsae exhibited higher virulence than S. feltiae. One indigenous isolate of S. carpocapsae (6Sc) provided similar or higher virulence than the commercial isolate against black cutworm larvae. An indigenous strain of S. kraussei demonstrated low virulence in our study.

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THE ROLE OF ENTOMOPATHOGENIC NEMATODES, STEINERNEMA SPP, IN THE BIOLOGICAL CONTROL OF AGROTIS IPSILON (LEPIDOPTERA: NOCTUIDAE)

Menoufia Journal of Plant Protection ◽

10.21608/mjapam.2017.126794 ◽

2017 ◽

Vol 2 (5) ◽

pp. 281-289

Author(s):

S.A. Ibrahim ◽

H.M. Mahfouz ◽

Mahasen M. Elshershaby ◽

Mona A. Hussein ◽

A.A. Dawod

Keyword(s):

Biological Control ◽

Entomopathogenic Nematodes ◽

Agrotis Ipsilon ◽

Lepidoptera Noctuidae

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Efficacy of some native entomopathogenic nematodes against the alfalfa weevil, Hypera postica (Gyllenhal) (Coleoptera: Curculionidae), and the lucerne beetle, Gonioctena fornicata (Brüggemann) (Coleoptera: Chrysomelidae), adults under laboratory conditions

Egyptian Journal of Biological Pest Control ◽

10.1186/s41938-021-00436-z ◽

2021 ◽

Vol 31 (1) ◽

Author(s):

Ayşegül Çağlayan ◽

Turgut Atay ◽

İlker Kepenekci

Keyword(s):

Biological Control ◽

Black Sea ◽

Entomopathogenic Nematodes ◽

Insect Pests ◽

Heterorhabditis Bacteriophora ◽

Steinernema Carpocapsae ◽

Alfalfa Weevil ◽

Hypera Postica ◽

Laboratory Conditions ◽

The World

Abstract Background Entomopathogenic nematodes (EPNs) have more important role in biological control of economic insect pests. The effect of native EPNs on adults of the lucerne beetle, Gonioctena fornicata (Brüggemann, 1873) (Coleoptera: Chrysomelidae), and the alfalfa weevil, Hypera postica (Gyllenhal, 1813) (Coleoptera: Curculionidae), which are important alfalfa pests in Turkey and around the world, was investigated. Results Dose-mortality assays were carried out with 5 isolates [Steinernema carpocapsae (Weiser, 1955) (Nematoda: Steinernematidae) (Black sea isolate), S. feltiae Filipjev, 1934 (isolate 09-31), Heterorhabditis bacteriophora Poinar, 1976 (Nematoda: Heterorhabditidae) (isolate 09-43), H. bacteriophora Tokat-Songut, and S. carpocapsae Tokat-Ulas] using doses of 500, 1000, and 2000 IJs ml−1 under the laboratory conditions. Studies showed that all isolates had an effect 90% and more at 2000 IJs ml−1 and at the end of 112 h [except, H. bacteriophora (isolate 09-43) and H. bacteriophora Tokat-Songut isolates against H. postica]. In addition, LT30, LT50, and LT90 values at 1000 IJs ml−1 were determined. Conclusions According to the results, G. fornicata adults were susceptible to all isolates tested in the study and H. postica adults were susceptible to the isolates S. carpocapsae (Black sea isolate), S. feltiae (isolate 09-31), and S. carpocapsae Tokat-Ulas. This is the first study conducted in Turkey for the virulence of EPNs against G. fornicata and H. postica.

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