The role of temperature on the pathogenicity of Beauveria bassiana in populations of sawtoothed grain beetle, Oryzaephilus surinamensis (Coleoptera: Silvanidae) fed on stored date fruits

Latifian, Masoud; Ghazavi, Mehran; Soleimannejadian, Ebrahim

doi:10.48311/jcp.2018.1403

The role of temperature on the pathogenicity of Beauveria bassiana in populations of sawtoothed grain beetle, Oryzaephilus surinamensis (Coleoptera: Silvanidae) fed on stored date fruits

https://doi.org/10.48311/jcp.2018.1403

Volume 7, Issue 4
December 2018

Pages 395-402

Document Type : Original Research

Authors

M. Latifian ¹

M. Ghazavi ²

E. Soleimannejadian ³

¹ Date Palm and Tropical Fruits Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Ahwaz, Iran.

² Iranian Research Institute of Plant ProtectionIranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran.

³ Department of Plant Protection, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

Abstract

Beauveria bassiana (Balsamo) is one of the promising microbial control agents for the management of Oryzaephilus surinamensis (L.) Death rate, lethal time and survival expectancy were calculated for an infected population of O. surinamensis at 15, 20, 25, 30 and 35 °C. Results showed that the mean death rate under above mentioned temperatures was 0.89, 1.15, 1.40, 1.21, and 1.11 larvae/day, respectively. The values were 0.99, 1.38, 1.47, 1.18 and 1.16 insects/day for adults respectively. LT₅₀s, at the same temperatures, were 7.11, 7.04, 4.82, 6.07 and 6.89 days for larvae and 7.03, 6.31, 4.83, 5.58, and 6.55 for adults, respectively. Survival curves for both larval and adult populations were more similar at 25, 30 and 35 °C compared to 15 and 20 °C. The survival rates in infected populations were low during 3^rd and 4^th days post inoculation and decreased with a sharp slope toward the end of the experiments under different temperatures. In every case, survival curves were of the 2^nd type in which the mortality decreases in a steady linear form.

Keywords

Entomopathogenic fungi

mortality

sawtoothed grain beetle

Beauveria bassiana

20.1001.1.22519041.2018.7.4.4.3

Subjects

Insect Microbial Control

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