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The potential of native strains of Metarhizium anisopliae (Metschnikoff) Sorokin in the management of brinjal ash weevil Myllocerus subfasciatus Guerin-Meneville (Curculionidae: Coleoptera)

Abstract

The ash weevil, Myllocerus subfasciatus, a major subterranean insect pest of brinjal, is managed using insecticides. Entomopathogenic fungi, such as Metarhizium anisopliae, have emerged as a viable alternative. To identify potential native Metarhizium spp., 38 soil samples were collected from brinjal fields. All eleven Metarhizium spp (anisopliae and robertsii) that were effective against M. subfasciatus had varying lethal concentrations and times. The M. anisopliae TNAU ENTMA TDM 8 strain was the most effective, with the lowest median lethal concentration of 2.13 x 105 conidia/ml and a median lethal time of 4.95 days. Field investigations still need to be conducted to identify potential candidate strains against ash weevil grubs and adults.

article Article; Early Access

date_range 2024

language English

link Link of the paper

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Udhayakumar Monisha

Sankaran Shanmugam

Marimuthu Murugan

Jawahar Jeyarani

Nandagopal Geetha

Thulasy Srinivasan

Rajasekaran Raghu

Kabirdoss Indhumathi

Rajendran Yamini

Murugesan Naveen

Selvam Saravanan

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Featured Keywords

Entomopathogenic fungi

Metarhizium anisopliae

Metarhizium robertsii

Myllocerus subfasciatus

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Effect of corrosion on flexural strength of reinforced concrete beams with polypropylene fibers

Abstract

An experimental study was performed to investigate the effects of polypropylene fibers on uncorroded and corroded reinforced concrete beams. Three different volume fractions of polypropylene fibers having 0, 0.5, and 1.5%, were tested at four corrosion levels of 0% and approximately 5, 7, and 9%. A full scale of an accelerated corrosion pool was used for the accelerated corrosion process. Reinforced concrete beams were used for an under monotonic bending test. The contribution of the actual corrosion levels of transverse and longitudinal reinforcement bars to the total corrosion levels were obtained from reinforcement bars fully extracted from concrete. Flexural strength, bond-slip, and moment-curvature relationships were examined for uncorroded and corroded reinforced concrete beams. A new model was developed to predict the flexural strength of corroded reinforced concrete beams. The proposed model for predicting the residual flexural strength of corroded beams was compared with test data published in previous studies. Furthermore, a novel model is presented for improved predictions between the actual and theoretically estimated corrosion mass losses, based on Faraday’s law, with the aid of fully extracted reinforcement bars. The model used to predict the flexural strength of corroded reinforced concrete beams with large sizes demonstrated good agreement with current and previously published literature data. In the case of corroded beams comprising differing amounts of polypropylene fibers, the performance of the corroded beams was limited by a fiber volume fraction of 1.5% at low corrosion levels.

article Article

date_range 2018

language English

link Link of the paper

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