Influence of pathogenic fungi on the life history and predation rate of mites attacking a psyllid pest.

Abstract:

:The two biological control agents, predatory mite Amblydromalus limonicus Garman & McGregor (Acari: Phytoseiidae) and entomopathogenic fungi (EPF) Beauveria bassiana (Balsamo) Vuillemin (Hypocreales: Cordycipitaceae), have the potential to independently suppress the invasive tomato potato psyllid (TPP), Bactericera cockerelli (Šulc), in New Zealand. The integrated strategy of combining the release of predatory mites and EPF may further promote biocontrol of pests. To examine the compatibility of A. limonicus and B. bassiana, we tested the lethal effects of B. bassiana on A. limonicus females on B. cockerelli and calculated the sublethal concentrations of B. bassiana. The effects of sublethal concentrations (LC10 and LC30) of EPF on predatory mite females were assessed on the reproduction parameters of the parental generation (F0). We also evaluated the transgenerational effects of EPF on life table parameters and predation rates of the offspring generation (F1) that was fed on the psyllids. Our results showed that A. limonicus females were susceptible to B. bassiana and the LC50 was 2.2 × 105 conidia mL-1. Sublethal concentrations of EPF (LC30) significantly reduced the fecundity, longevity, oviposition period and predation rates of F0 predatory mite females. However, life table and predation rates of F1 predatory mites were not influenced by sublethal concentrations (LC30), except for the reduction of the preadult and total pre-oviposition period, and the predation rate of F1 males. Also, F1 population parameters including the intrinsic rate of increase (rm), finite rate of increase (λ), gross reproduction rate (GRR), and net reproduction rate (R0) were not significantly influenced by sublethal concentrations (LC10 and LC30). This result suggests that the transgenerational effects of entomopathogenic fungi cannot be carried over to F1. In conclusion, the simultaneous application of both biological control agents does have the potential to control TPP at appropriate intervals during the crop season. Further evaluation in the field will be needed to confirm the viability of this approach to control TPP.

journal_name

Ecotoxicol Environ Saf

authors

Liu JF,Zhang ZQ,Beggs JR,Wei XY

doi

10.1016/j.ecoenv.2019.109585

subject

Has Abstract

pub_date

2019-11-15 00:00:00

pages

109585

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(19)30916-9

journal_volume

183

pub_type

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