Performance of Three Isolates of Metarhizium anisopliae and Their Virulence against Zeugodacus cucurbitae under Different Temperature Regimes, with Global Extrapolation of Their Efficiency

Insects

Bernard M. Gichimu¹  Samira A. Mohamed²  Susan K. Onsongo²  Komivi S. Akutse²  Thomas Dubois² 

[1] Department of Agricultural Resource Management, University of Embu, Embu 60100, Kenya;Plant Health Division, International Centre of Insect Physiology and Ecology (icipe), Nairobi 00100, Kenya;

关键词: entomopathogenic fungus;    germination;    melon fly;    percentage mortality;    radial growth;    sporulation;   

DOI  :  10.3390/insects10090270

来源: DOAJ

【 摘 要 】

The performance of entomopathogenic fungi in pest control is usually affected by both biotic and abiotic factors. This study aimed to determine the effects of various temperatures (15, 20, 25 and 30 °C) on conidial germination, mycelial growth and conidial density and virulence to the melon fly Zeugodacus cucurbitae of three selected isolates of Metarhizium anisopliae. The three isolates, ICIPE 18, ICIPE 30 and ICIPE 69, had previously been selected in laboratory bioassays. Percentage mortality by the three isolates ranged between 16.25% and 100.0% across the different temperatures. The isolates ICIPE 69 and ICIPE 18 recorded the highest percentage mortality of 96.25% and 100% and the shortest LT₅₀ values of 2.61 and 2.63 days, respectively, at 30 °C. However, at 30 °C, ICIPE 69 produced the highest number of conidia of 90.5 × 10⁷ /mL and was therefore selected for global mapping to predict its efficacy against Z. cucurbitae using the geospatial temperature data layer and the best fitted quadratic model. The map showed that the isolate would be more effective in the tropics than in temperate climates.

【 授权许可】

Unknown