The entomopathogenic fungus Beauveria bassiana used as granules has no impact on the soil-dwelling predatory mite Stratiolaelaps scimitus

2018 ◽  
Vol 23 (11) ◽  
pp. 2165
Author(s):  
Weinan Sun ◽  
Shovon Chandra Sarkar ◽  
Xuenong Xu ◽  
Zhongren Lei ◽  
Shengyong Wu ◽  
...  
Keyword(s):  
Beauveria Bassiana ◽  
Frankliniella Occidentalis ◽  
Survival Rates ◽  
Predatory Mite ◽  
Immature Stage ◽  
Immature Development ◽  
Combined Use ◽  
Important Pest ◽  
Stratiolaelaps Scimitus ◽  
Fungus Beauveria Bassiana

Frankliniella occidentalis (Pergande) is an economically important pest worldwide and has demonstrated a particularly difficult to manage. Controlling soil-pupating thrips is a promising strategy for controlling F. occidentalis. Beauveria bassiana granules and soil inhabiting predatory mite Stratiolaelaps scimitus have been proposed as alternative control agents. This study evaluated the effect of the B. bassiana conidia on the survival, immature development, longevity, reproduction of S. scimitus by laboratory bioassays. The effect of B. bassiana used as granules on survival of S. scimitus was also assessed under potted condition. When B. bassiana was sprayed directly on each immature stage of S. scimitus at a concentration of 1×107 ml-1 conidia, their survival rates and developmental times were not affected. Direct spray of B. bassiana on female S. scimitus did not affect their reproduction and longevity. The potted test showed that B. bassiana used as granules has no impact on the density of S. scimitus. Our study suggested that using B. bassiana granules is compatible with release of S. scimitus in soil, and their combined use may be an alternative to traditional F. occidentalis management. 

Development, survival and reproduction of Stratiolaelaps scimitus (Acari: Laelapidae) on four diets 

2018 ◽  
Vol 23 (4) ◽  
pp. 779 ◽  
Author(s):  
Lixia Xie ◽  
Yi Yan ◽  
Zhi-Qiang Zhang
Keyword(s):  
Survival Rates ◽  
Intrinsic Rate ◽  
Reproductive Rate ◽  
Population Increase ◽  
Net Reproductive Rate ◽  
Immature Development ◽  
Combined Use ◽  
Survival And Reproduction ◽  
Artemia Cysts ◽  
Stratiolaelaps Scimitus

.The development, survival and reproduction of Stratiolaelaps scimitus (Acari: Laelapidae) were determined on four diets (Ephestia kuehniella eggs, Artemia sp. cysts, Typha orientalis pollen, and Tyrophagus curvipenis) in the laboratory at 25 ± 1°C, 80 ± 5% RH, 24 h D: 0 h L. E. kuehniella eggs and T. curvipenis were very suitable for the overall development of S. scimitus to adulthood, with over 90% survival rates. Shrimp cysts were not suitable, with 11.1% survival to adults, and T. orientalis pollen were intermediate, with 50% survival to adults.  S. scimitus immature development was the fastest on T. curvipenis (9.67 ± 0.18 days), and it was also very fast on E. kuehniella eggs, but relatively slow on T. orientalis pollen  (18.26 ± 0.68 days) and the slowest on Artemia cysts (21.36 ± 1.23 days). The female pre-ovipositional period (APOP) averaged less than 3 days on E. kuehniella eggs but over 3 days on T. curvipenis, but mated and unmated females had a similar APOP, regardless of diet. Neither diet nor mating had significant effects on the total pre-ovipositional period from birth to oviposition (around 13 days). The oviposition period averaged 1 to 2 days longer for mated females than unmated ones, regardless of diet, which had no significant effects. Mated females produced 50% more eggs than unmated females when feeding on E. kuehniella eggs, but 69% more than unmated females when feeding on T. curvipenis; the effects of mating were significant, and the effects of diet were different depending on mating status of the predators: fecundity was higher on E. kuehniella eggs (20.21 ± 1.16) than on T. curvipenis (17.07 ± 0.49) only for unmated females.  Most life table parameters (intrinsic rate of population increase r, finite rate of population increase λ, and net reproductive rate R0) were not significantly affected by diet and mating. However, the mean generation time T was shorter in unmated females than in mated ones, and more so when feeding on T. curvipenis. T. curvipenis is easy to rear, so it is considered a very promising diet for S. scimitus as it does not damage plants nor cause allergenic reactions in workers or users. Since T. curvipenis is common on plants, future studies should explore the combined use of foliar predators (e.g. Phytoseiidae) and soil predators for the biocontrol of greenhouse pests (e.g. thrips) using a shared non-pest prey such as T. curvipenis.

Evaluation and Molecular Characterization of Beauveria bassiana for the Control of the Glassy-winged Sharpshooter (Homoptera: Cicadellidae) in California

2008 ◽  
Vol 43 (2) ◽  
pp. 241-246 ◽  
Author(s):  
Surendra K. Dara ◽  
Michael R. McGuire ◽  
Mauricio Ulloa ◽  
Harry K. Kaya
Keyword(s):  
Beauveria Bassiana ◽  
Genetic Relatedness ◽  
Plant Diseases ◽  
Insect Vector ◽  
Homalodisca Coagulata ◽  
Important Pest ◽  
Spissistilus Festinus ◽  
Fungus Beauveria Bassiana ◽  
Almond Leaf Scorch

The glassy-winged sharpshooter, Homalodisca coagulata (Say), is an important pest on grapes, citrus, almonds and other commercial crops in California as it is a vector of Xylella fastidiosa Wells, a bacterium that causes Pierce's disease in grapes, citrus variegated chlorosis, almond leaf scorch and other plant diseases. Various entomopathogenic fungi isolated from natural infections of H. coagulata, its habitats and other insect hosts were evaluated against this insect vector. Based on these studies, 3 isolates of the hyphomycetous fungus, Beauveria bassiana (Balsamo) Vuillemin, were selected for further evaluation. Two of these were California isolates, one each from the three-cornered alfalfa hopper, Spissistilus festinus (Say), and soil from H. coagulata habitat, and the third was a Texas isolate from natural infections of H. coagulata. All three were similar in their virulence to H. coagulata under laboratory conditions. The genetic relatedness of the B. bassiana isolates also was compared using single sequence repeat (SSR) markers which showed genetic diversity of this species based on the source of the isolate. Some isolates were 4× more infectious than others demonstrating that virulence of B. bassiana is not necessarily associated with their genetic relatedness.

scholarly journals Management of the Egyptian alfalfa weevil, Hypera brunneipennis (Boheman) (Coleoptera: Curculionidae), in the alfalfa, Medicago sativa L., using the entomopathogenic fungus, Beauveria bassiana (Balsamo) Vuillemin

2019 ◽  
Vol 29 (1) ◽  
Author(s):  
Monir M. M. El Husseini
Keyword(s):  
Medicago Sativa ◽  
Beauveria Bassiana ◽  
Entomopathogenic Fungus ◽  
Larval Population ◽  
Alfalfa Weevil ◽  
Alfalfa Field ◽  
Medicago Sativa L ◽  
Hypera Brunneipennis ◽  
Fungus Beauveria Bassiana ◽  
Sweep Net

AbstractLarval and adult populations of the Egyptian alfalfa weevil (EAW) Hypera brunneipennis (Boheman) (Coleoptera: Curculionidae) was monitored after application of the entomopathogenic fungus Beauveria bassiana in the alfalfa field (Medicago sativa L.) in two successive seasons 2014/2015 and 2015/2016. The second and last generation of the weevil on April 10, 2016, was controlled by only one application with the conidiospores of the entomopathogenic fungus B. bassiana (3 × 108 spores/ml). Accordingly, the larval population decreased from 16.07 ± 1.09 in season 2015/2016 to 7.37 ± 0.05 individuals/50 sweep net double strokes in season 2016/2017. Also, the adult weevil’s population decreased from 5.66 ± 0.8 to 2.55 ± 0.6 individuals/50 sweep net double strokes in the two seasons, respectively. 39.66% mortality rate was recorded in the Hypera brunneipennis adults aestivated under loose bark of the surrounding eucalyptus trees, which received the application of B. bassiana in the field. Another application with the fungus, targeting the second generation of the pest adults in alfalfa each season, will undoubtedly lead to a further decrease in the pest population.

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