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Torigoe, Hiroaki; Izumi, Shoichi; Yamaguchi, Takuhiro

doi:10.4241/kyubyochu.46.101

Cited by 2 publications

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“…The difference in the efficacy of these two fungi on the weevil suggests that C. formicarius is more susceptible to B. bassiana and less or more resistant to M. anisopliae. This corresponds to the results in [27], where better control for C. formicarius is reported in B. bassiana than in M. anisopliae. Our preliminary observations on B. bassiana, however, showed lower lethal effects on E. postfasciatus.…”

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confidence: 89%

Different Susceptibility in the Two Sympatric Sweet Potato Weevils, Cylas formicarius and Euscepes postfasciatus, to the Entomopathogenic Fungus Metarhizium anisopliae

Reddy,

Shimizu,

Ichinose

2023

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Laboratory and field experiments were performed to evaluate the pathogenicity of an isolate of the entomopathogenic fungus Metarhizium anisopliae to the two sympatrically occurring weevil species, Cylas formicarius and Euscepes postfasciatus. In the laboratory bioassays, suspension of conidia, ≥10 6 CFU/mL, caused mortalities > 80% on adults of both weevils in seven days after inoculation. It took longer time 20 days for grain formulation of the isolate adhered on rice grains of ≥5 g/m 2 (10 7 CFU/g) to attain similar mortalities of E. postfasciatus, but no evident mortality was obtained in C. formicarius. The grain formulation was thus less effective on C. formicarius than the suspension. Field trials were carried out over two years from 2013 to 2014, in which adults of E. postfasciatus were released two times during the field experiments for enhancement of damage on plants by this weevil, whereas the other weevil species was left to naturally invade the experimental plots by flying. The results of the experiments revealed in both years that two applications of the isolate in grain formulation, equivalent to 50 kg/hectare, sprayed manually over the ground surface reduced the infestation of plants and tuber damage by weevils of both species as much as the conventional chemical insecticide applications. The occurrences of weevils at harvest were not significantly different among treatments. The potential and possible uses of the fungus are discussed for the management of these two weevil species.

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Section: Discussionsupporting

confidence: 89%

Different Susceptibility in the Two Sympatric Sweet Potato Weevils, Cylas formicarius and Euscepes postfasciatus, to the Entomopathogenic Fungus Metarhizium anisopliae

Reddy,

Shimizu,

Ichinose

2023

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Pathogenicity of Steinernematid Nematodes on the Sweet Potato Weevil, Cylas formicarius (Fabricius) (Coleoptera: Brentidae) and Their Feasibility for Suppression of the Weevil Population

Yamaguchi¹,

Kawasoe²,

Izumi³

2006

Jpn. J. Appl. Entomol. Zool.

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Abstract:We evaluated entomopathogenic nematodes (Steinernematidae) as potential biocontrol agents to suppress the wild population of the sweet potato weevil, Cylas formicarius (Fabricius) as part of its eradication program. The pathogenicity of Steinernema carpocapsae ('All' strain), S. feltiae, S. riobrave and S. glaseri ('326', '328', 'Mungyeong' and 'Dongrae' strains) was checked against the sweet potato weevil under laboratory conditions. S. carpocapsae induced the highest mortality in both sexes of the adult sweet potato weevil (90%Ͻ). About 30-60% of pupae and larvae in the root of sweet potatoes were killed by S. riobrave, S. glaseri ('Mungyeong' strain) and S. glaseri ('Dongrae' strain). The efficacy of S. carpocapsae ('All' strain) on the suppression of the weevil population was then tested in a sweet potato field. Application of S. carpocapsae ('All' strain) successfully reduced the root damage rate and root damage index by approximately 60% and 40%, respectively, as compared with root damage in the control fields. These results suggested that S. carpocapsae ('All' strain) would be an appropriate and effective biocontrol agent for suppressing the weevil population.

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Different Susceptibility in the Two Sympatric Sweet Potato Weevils, <i>Cylas formicarius</i> and <i>Euscepes postfasciatus</i>, to the Entomopathogenic Fungus <i>Metarhizium anisopliae</i>

Different Susceptibility in the Two Sympatric Sweet Potato Weevils, <i>Cylas formicarius</i> and <i>Euscepes postfasciatus</i>, to the Entomopathogenic Fungus <i>Metarhizium anisopliae</i>

Pathogenicity of Steinernematid Nematodes on the Sweet Potato Weevil, Cylas formicarius (Fabricius) (Coleoptera: Brentidae) and Their Feasibility for Suppression of the Weevil Population

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Untitled

Cited by 2 publications

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Different Susceptibility in the Two Sympatric Sweet Potato Weevils, &lt;i&gt;Cylas formicarius&lt;/i&gt; and &lt;i&gt;Euscepes postfasciatus&lt;/i&gt;, to the Entomopathogenic Fungus &lt;i&gt;Metarhizium anisopliae&lt;/i&gt;

Different Susceptibility in the Two Sympatric Sweet Potato Weevils, &lt;i&gt;Cylas formicarius&lt;/i&gt; and &lt;i&gt;Euscepes postfasciatus&lt;/i&gt;, to the Entomopathogenic Fungus &lt;i&gt;Metarhizium anisopliae&lt;/i&gt;

Pathogenicity of Steinernematid Nematodes on the Sweet Potato Weevil, Cylas formicarius (Fabricius) (Coleoptera: Brentidae) and Their Feasibility for Suppression of the Weevil Population

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Different Susceptibility in the Two Sympatric Sweet Potato Weevils, <i>Cylas formicarius</i> and <i>Euscepes postfasciatus</i>, to the Entomopathogenic Fungus <i>Metarhizium anisopliae</i>

Different Susceptibility in the Two Sympatric Sweet Potato Weevils, <i>Cylas formicarius</i> and <i>Euscepes postfasciatus</i>, to the Entomopathogenic Fungus <i>Metarhizium anisopliae</i>