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• W147454989 abstract "The Andean potato weevil (APW) is a complex of 14 species of the genera Premnotrypes and Rhigopsidius. It is one of the most important insect potato pests in the Andes from Venezuela to north-western Argentina above 2800 meter. The larvae feed inside the potato tuber causing severe damage. In a survey with over 600 farmers from all over Peru, average damages of 23% by APW are reported. Actually control is mainly based on the application of the insecticides Metamidophos and Carbofuran. The present studies have been carried out with Premnotrypes suturicallus, the dominant species in the central highlands of Peru. Temperature dependent development and mortality rates of all life stages as well as adult longevity and fecundity were determined under laboratory conditions at constant temperatures. The non-linear thermodynamic model from Sharp and DeMichele was adapted to the data. Survival of all stages of APW and fecundity were maximal at temperatures between 11° C and 15° C. Especially oviposition was severely affected by temperature above 20° C. For soil stages, additionally the influence of soil humidity on development and mortality rates was determined. At approximately 8% soil water content, a threshold was observed below which development of pre-pupae and adult emergence was markedly retarded. A facultative dormancy could be suggested for pre-pupae to overcome the dry season. Under field conditions, the population development was studied along an altitude gradient from sea level to 4100 meter. Only few individuals survived at an altitude of 2400 meter (corresponding to 16.7° C) making it the lower distribution limit of P. suturicallus. These field studies confirmed the cold adaptation of the weevil as found under laboratory conditions. Bioassays showing good pathogenicity of the entomopathogenic fungus Beauveria bassiana against pre-pupae and adult weevils in the laboratory could not be confirmed by cage and open field trials. Further experiments showed, that the median lethal concentration (LC50) was 1600 times higher (respectively the pathogenicity lower) at 13° C than at 19° C. This means, that under the optimal environmental conditions for the weevil, the performance of the fungus could be substantially reduced. Additionally investigations aimed at studying the possibility to control neonate larvae in the soil with B. bassiana. LC50 values for larvae feeding in tubers were 10,000 times higher than for larvae kept in an empty container. By the determination of colony forming units on the larval cuticle, by scanning electron microscopy and by fluorescence microscopy, the loss of most (in many cases all) conidia from the cuticle of neonates moving through soil or feeding in potato tubers was proven. These results demonstrate, that environmental conditions and larval behaviour render it almost impossible to use B. bassiana successfully in the control of APW." @default.
• W147454989 created "2016-06-24" @default.
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• W147454989 date "2022-02-20" @default.
• W147454989 modified "2023-10-14" @default.
• W147454989 title "The Andean potato weevil Premnotrypes suturicallus - Ecology and interactions with the entomopathogenic fungus Beauveria bassiana" @default.
• W147454989 doi "https://doi.org/10.53846/goediss-3624" @default.
• W147454989 hasPublicationYear "2022" @default.
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