Poor infectivity of Beauveria bassiana to eggs and immatures causes the failure of suppression on Tetranychus urticae population

Wu, Shengyong; Sarkar, Shovon Chandra; Lv, Jiale; Xu, Xuenong; Lei, Zhongren

doi:10.1007/s10526-019-09970-0

Cited by 13 publications

(12 citation statements)

References 32 publications

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“…Shin et al (2017) reported that 3 isolates of B. bassiana applied at the concentration of 10 8 conidia/ ml caused 55-82% T. urticae mortality, whereas the different isolates used in a study by Yanar et al (2018) had 32.5-72.5% effect on T. urticae when applied at 5×10 6 effect rate. Wu et al (2020) also found that a 0.7×10 5 conidia/ml concentration of B. bassiana was highly effective with a mortality rate of 63.2-72.1% in T. urticae adults. Enzymes produced by each isolate may be correlated to the difference in virulence between the different fungal isolates of T. urticae.…”

Section: Discussionmentioning

confidence: 86%

Effects of local isolates of Beauveria bassiana (Balsamo) Vuillemin on the two-spotted spider mite, Tetranychus urticae (Koch) (Acari: Tetranychidae)

Yücel¹

2021

Egypt J Biol Pest Control

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Background The two-spotted spider mite, Tetranychus urticae (Koch) (Acari: Tetranychidae), is a widely distributed plant-feeding pest that causes significant yield losses in a wide range of crops. Newly developed or improved environmentally friendly biocontrol agents serve as an alternative to traditional pest control tools. Experiment of the effects of 2 local fungal isolates of Beauveria bassiana (BGF14 and BCA32) was carried out against T. urticae under laboratory conditions. Results Both tested isolates had lethal effect in a short time after application, and this effect increased as time progressed. BGF14 and BCA32 isolates caused T. urticae mortality rates ranging from 25.88 to 61.92 and 32.36 to 62.03% when applied at the concentrations between 1×105 and 1×108 conidia/ml, respectively. According to the Probit analysis performed on the effect of fungi on T. urticae adults, the LC50 values of BGF14 and BCA32 isolates on the 7th day after inoculation were 2.6×106 and 6.3×104 conidia/ml, respectively, and the LT50 values for both fungi applied at a concentration of 108 conidia/ml were 2.14 and 2.23 days, respectively. Conclusions The 2 isolates of B. bassiana (BGF14 and BCA32) had the potentials to suppress T. urticae population and can be recommended as promising biocontrol agent candidates for control of T. urticae.

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Section: Discussionmentioning

confidence: 86%

Effects of local isolates of Beauveria bassiana (Balsamo) Vuillemin on the two-spotted spider mite, Tetranychus urticae (Koch) (Acari: Tetranychidae)

Yücel¹

2021

Egypt J Biol Pest Control

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“…Similarly, eggs of Tetranychus urticae Koch are much less susceptible to B. bassiana than later life stages. 50 Although B. bassiana can be pathogenic to parasitoids, 51 T. dendrolimi displayed relatively low susceptibility to strain D1-5. Concentrations of 2.5 × 10 8 conidia mL −1 or higher were required to cause >35% mortality of adult wasps and females surviving treatments parasitized G. molesta eggs to a similar extent as control females, suggesting the wasp would be relatively compatible with simultaneous applications of the fungus at concentrations sufficient to cause significant mortality to the pest population.…”

Section: Discussionmentioning

confidence: 99%

“…Possibly, the chorion presents a hard physical barrier that impedes penetration of B. bassiana appressoria. Similarly, eggs of Tetranychus urticae Koch are much less susceptible to B. bassiana than later life stages 50 …”

Section: Discussionmentioning

confidence: 99%

Laboratory evaluation of the compatibility of Beauveria bassiana with the egg parasitoid Trichogramma dendrolimi (Hymenoptera: Trichogrammatidae) for joint application against the oriental fruit moth Grapholita molesta (Lepidoptera: Tortricidae)

Fang

Liu

et al. 2022

Pest Management Science

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BACKGROUND The entomopathogenic fungus Beauveria bassiana and the egg parasitoid Trichogramma dendrolimi can both contribute to biological control of the global fruit borer Grapholita molesta. To derive insights for optimizing their combined application in augmentation programs, we assayed fungal pathogenicity to both G. molesta (eggs, larvae and adults) and adult parasitoids, and assessed wasp acquisition and transmission of fungal spores following their emergence from B. bassiana‐treated host eggs. RESULTS Concentrations of 108 conidia mL−1 of B. bassiana and higher caused virtually complete mortality of G. molesta larvae, but less than 30% mortality of eggs, and female moths surviving treatments had reduced fecundity. More than 80% of adult T. dendrolimi survived B. bassiana treatments of 107 conidia mL−1, and more than 60% survived 109 conidia mL−1, with surviving females achieving reproductive success equivalent to controls. Parasitoid females preferred healthy eggs over B. bassiana‐infected ones in choice tests; wasps emerging from treated eggs carried about 104 conidia each and contributed an additional 11% host mortality in trials combining both agents. CONCLUSION Our results indicate that combined applications of B. bassiana and T. dendrolimi can have complimentary impacts on G. molesta, the wasps compensating for low fungal pathogenicity to eggs and their progeny potentially aiding in subsequent disease transmission. Although foraging wasps tended to avoid infected eggs, negative interactions between the two agents might be further mitigated by timing B. bassiana applications from late instar larva to early moth stage, and T. dendrolimi releases several days later to coincide with peak oviposition periods. © 2022 Society of Chemical Industry.

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“…while at 35 o C, it increased to 65.1% and 83.0% after the detected periods, respectively. Shengyong et al 2020 observed that, fecundity of female mites of Tetranychus urticae was significantly reduced after fungal treatment by using spraying techniques under laboratory conditions. Also, corrected mortalities were recorded 2.…”

Section: Acaricidal Activity Of a Aflatoxiformans Against T Urticaementioning

confidence: 93%

Isolation and Identification of The Fungal Pathogen Aspergillus aflatoxiformans Strain and Its Role in Controlling The Two-Spotted Spider Mite Tetranychus urticae (Koch) عزل وتعريف المسبب المرضي Aspergillus aflatoxiformans ودوره في مکافحة أکاروس العنکبوت الأحمر ذي البقعتين Tetranychus urticae (Koch)

Emam

Mohamed

2021

Journal of Plant Protection and Pathology

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The two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae) is the major mite pest infesting many cultivated crops. The fungus, Aspergillus aflatoxiformans Frisvad, Ezekiel, Samson & Houbraken produces aflatoxins where it considered as secondary polyketide metabolites, which cause the death of pests. Therefore, this work aimed to isolate and identify this fungus by amplify the internal transcribed spacer (ITS) region of the rDNA, as well as to evaluate the efficiency of this fungus to control T. urticae. Results showed 300bp DNA product corresponding to the omt-A gene. The existence of omt-A gene in A. aflatoxiformans reflected its ability to produce aflatoxin, which may be responsible of mite control. The efficacy of A. aflatoxiformans against T. urticae recorded the highest reduction percentage of eggs hatch at concentration of 1x10 8 conidia/ml within the 5 th and 6 th day after exposure. These percentages were 99.42 and 100%, respectively. The highest mortality percentage was recorded on the 4 th , 5 th and 6 th day at higher concentration of 1x10 8 . No eggs and larvae of T. urticae were observed within the 5 th and 6 th day after treatment at 1x10 8 . There were not observed nymphs at all tested concentrations. Microelectronic photos showed fungal conidia with cluster shaped which were developed at all T. urticae body surface 6 days after treatments at 1x10 7 and 1x10 8 . Results also confirmed that A. aflatoxiformans could be used successfully to control T. urticae eggs, immature stages and adults. Therefore, this fungus could be involved in any IPM programs of the two-spotted mite.

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Poor infectivity of Beauveria bassiana to eggs and immatures causes the failure of suppression on Tetranychus urticae population

Cited by 13 publications

References 32 publications

Effects of local isolates of Beauveria bassiana (Balsamo) Vuillemin on the two-spotted spider mite, Tetranychus urticae (Koch) (Acari: Tetranychidae)

Effects of local isolates of Beauveria bassiana (Balsamo) Vuillemin on the two-spotted spider mite, Tetranychus urticae (Koch) (Acari: Tetranychidae)

Laboratory evaluation of the compatibility of Beauveria bassiana with the egg parasitoid Trichogramma dendrolimi (Hymenoptera: Trichogrammatidae) for joint application against the oriental fruit moth Grapholita molesta (Lepidoptera: Tortricidae)

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