Susceptibility of Tuta absoluta (Lepidoptera: Gelechiidae) Pupae to Soil Applied Entomopathogenic Fungal Biopesticides

Management of (Meyrick) (Lepidoptera: Gelechiidae) in greenhouses and under open-field tomato cultivation relies on an integrated approach, largely targeting the egg and larval stages of the pest. However, little to no research has been done on the efficacy of EPFs for control of the pupal stage. Th...

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Bibliographic Details
Published in:Insects (Basel, Switzerland) Switzerland), 2021-06, Vol.12 (6), p.515
Main Authors: Erasmus, Reynardt, van den Berg, Johnnie, du Plessis, Hannalene
Format: Article
Language:English
Subjects:
Agricultural practices
Beauveria bassiana
Bioassays
biopesticide
Butterflies & moths
Conidia
Control methods
Cultivation
Eggs
Entomopathogenic fungi
Experiments
Fecundity
Females
Fertility
Fruit cultivation
Gelechiidae
Humidity
Insecticide resistance
Insecticides
Insects
Integrated pest management
Laboratories
Lepidoptera
Life cycles
Metarhizium anisopliae
Mortality
Pest control
pest management
Pesticides
Pests
Pupae
soil application
Soil fertility
Soils
Spores
Substrates
tomato pinworm
Tomatoes
Tuta absoluta
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Summary:Management of (Meyrick) (Lepidoptera: Gelechiidae) in greenhouses and under open-field tomato cultivation relies on an integrated approach, largely targeting the egg and larval stages of the pest. However, little to no research has been done on the efficacy of EPFs for control of the pupal stage. The aims of this study were to determine the susceptibility of pupae to and spores applied as soil drench treatments, and the possible effects of these treatments on fecundity and fertility of moths. The lethal concentrations (LC and LC ) of the respective products were estimated in dose-response bioassays by exposing pupae in a soil substrate to different concentrations of EPF products. Emerging moths were paired in different combinations, according to EPF exposure treatments after which fecundity and fertility of females were recorded. Pupae in the soil were effectively controlled by all EPF products in both bioassays as well as in a growth tunnel experiment. The LC value of the oil formulation was significantly lower than that of other treatments. The fecundity of females that were subjected to the oil formulation was significantly lower than that of the control treatment. This study showed the potential of soil drench applications of both and . for control of pupae.
ISSN:2075-4450
2075-4450
DOI:10.3390/insects12060515