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Pathogenicity of three entomopathogenic fungi against the Mediterranean fruit fly, Ceratitis capitata (Wiedemann) (Diptera: Tephritidae)

Abstract

The use of pesticides against the Mediterranean fruit fly, Ceratitis capitata (Wiedemann) (Diptera: Tephritidae) as a tool to control the pest has become an obstacle to the fresh agricultural products export to many countries that restrict pesticides residues. The effectiveness of three local strains of entomopathogenic fungi: Metarhizium anisopliae, Beauveria bassiana, and Paecilomyces lilacinus against the adult and immature stages of C. capitata was evaluated under laboratory conditions. Obtained results showed that M. anisopliae and B. bassiana were superior in its pathogenicity and potential to kill the pest than P. lilacinus. These results may be important to be used for the control of the pest in IPM program.

Background

The Mediterranean fruit fly, Ceratitis capitata (Wiedemann) (Diptera: Tephritidae), is one of the economic horticultural pests in Egypt and Mediterranean basin due to its ability to infest wide range of fruits. Ceratitis capitata attacks more than 300 different hosts and leave negatively economic impact (Papadopoulos et al. 2001). Flies control depends mainly on chemical sprays (organophosphates, especially malathion, pyrethroids, and spinosad) mixed with protein baits (Martinez-Ferrer et al. 2012) in the orchards as well as larvae and pupae found in soil (Stark and Vargas 2009). However, synthetic pesticides for crop protection in aggravating use cause a number of undesirable effects on human health and the environment (Perry et al. 1998).

Entomopathogenic fungi (EPF) are soil-borne microorganisms, where optimal temperature in agricultural soil for their growth, sporulation, and infection often ranges from 20 to 30 °C, but variation in temperature tolerance within a strain can be significant. There are several factors negatively affecting on EPF presence in the soil such as copper content and fungicides (Uzman et al. 2019), nevertheless, Metarhizium spp. can be the dominant EPF genus in agricultural soil (Thaczuk et al. 2014) than Beauveria bassiana (Balsamo) Vuillemin. Also, organic matter (for M. anisopliae (Metschnikoff) Sorokin) and pH clay content (for B. bassiana) did not affect the occurrence of EPF (Quesada-Moraga et al. 2007). Consequently, EPF form an important component of an integrated pest management strategy for fruit flies via soil treatment. Also, EPF had effective role in fly regulation in the field (Sookar 2014). Entomopathogenic fungi, compared to other soil micro-organisms, have the advantage that they can infect their hosts via contact, invade via the epicuticle of integument, and do not need to be ingested by the insect to cause infection (Lacey and Shapiro-Ilan 2008).

Many investigations revealed that EPF have a significant role as biological control agents against different tephritids (Soliman et al. 2014). Beauveria bassiana and M. anisopliae are highly virulent against the Mediterranean fruit fly and can infect adults, larvae, or pupae via different routes of exposure (Castillo and Moya 2000; Ekesi et al. 2002, 2003; Dimbi et al. 2003; Konstantopoulou and Mazomenos 2005; Quesada-Moraga et al. 2006).

The objective of this investigation was to evaluate the virulence of locally isolated strains of the EPF; M. anisopliae, B. bassiana, and Paecilomyces lilacinus against C. capitata stages via different concentrations under laboratory conditions.

Material and methods

Elaboration of rearing

The Mediterranean fruit fly C. capitata was obtained from the rearing laboratory of Horticultural Pest Department, Plant Protection Research Institute (PPRI), Agricultural Research Center (ARC), Giza, Egypt. Flies fed on sugar and protein hydrolysate in a ratio 3:1, respectively (El-Sayed 1979), in addition to a source of water. Produced eggs were collected daily and reared on the artificial rearing medium described by Tanaka et al. (1969). After larvae complete the third larval instar, larvae were received in water then collected in fine sand obtained from Al-Arish City (Saini peninsula) for pupation. A day before the emergence of flies, pupae were sieved and located in screen cage (30 cm × 30cm × 30 cm) allowing the emerged flies to feed, mate, and produce eggs.

Fungal strains and conidiospores production

Local strains of B. bassiana 5133, M. anisopliae 5130, and P. lilacinus 1062 were used in the current study. These isolates were obtained from the Center for Fungi, Faculty of Science, Assiut University, Assiut, Egypt. Conidial viability test was achieved on these isolates. Conidia obtained from the 3 fungal cultures were grown on potato dextrose agar (PDA), consisting of 10 g/l potato, 20 g/l glucose, and 20 g/l agar-agar in Petri dishes (9 cm diameter and 1.5 cm in height). After 15 days of incubation at 25 °C and 60% RH, the conidia were harvested from the plates by grazing with sterile spatula into 1% Tween-80. The suspension was vortexed for 30 min using agitator at room temperature. The conidial concentration of the resulting stock suspension was estimated using hemocytometer under light microscope for each fungus. A series of dilutions were made to give concentrations range of 106, 107, 108, 109, and 1010 conidia/ml suspensions were held on ice at 4 °C to prevent conidial germination until using in bioassay as described by Gabarty et al. (2014).

Bioassay tests

Adults, third larval instar, and pupae were used in this bioassay. Ten third instar larvae were dipped in 2 ml of the above-mentioned fungal concentrations (conidia/ml) for 30 s, then transferred to a Petri dish containing 10 mg standard steam-autoclaved-sterilized fine sand, covered by the lid, sealed with plastic parafilm to avoid external contamination, and kept at 25 °C in a complete darkness. A plastic cage, 0.5 L capacity, was sprayed by 2 ml of conidial suspension and kept to dry, and then 10 newly emerged flies (unequal in sex) were entered. Control cages were treated by 2 ml of 1% tween 80. Artificial diet was supplied. Flies mortality were recorded 6 days after treatment. Dead flies were incubated in 25 °C and 65% RH to observe mycosis. All bioassays were recorded and analyzed based on four independent replicates.

Statistical analysis

Mortalities were corrected using Abbott formula (Abbott 1925). Probit analysis was used to determine lethal and sublethal levels (Finney 1971). The difference among treatments in rate of mortality was determined by analysis of variance (ANOVA) and Tukey’s method was used to compare mean significant differences among treatments (p < 0.05) using SPSS 26 statistical software.

Results and discussion

This study addressed the pathogenicity of three EPF: M. anisopliae, B. bassiana, and P. lilacinus, against different stages of C. capitata, with different levels (Tables 1, 2, 3, and 4). To address the pathogenicity, it was needed to analyze the effect of different fungal concentrations on different immature stages of C. capitata as well as adult stage.

Table 1 Susceptibility of Ceratitis capitata immature stages to Metarhizium anisopliae, Beauveria bassiana, and Paecilomyces lilacinus at different concentrations
Table 2 Toxicity of Metarhizium anisopliae, Beauveria bassiana and Paecilomyces lilacinus to different stages of Ceratitis capitata
Table 3 Mean percentage of mortality (±SD) of Ceratitis capitata adults at different treatment times (h) using different concentrations of Metarhizium anisopliae, Beauveria bassiana, and Paecilomyces lilacinus
Table 4 Lethal time LT (h) for Ceratitis capitata treated with different concentrations of Metarhizium anisopliae, Beauveria bassiana, and Paecilomyces lilacinus

Susceptibility of C. capitata larvae

Mean percentage of larval mortality of C. capitata treated with different concentrations of fungi showed significant increase in mortality (p value < 0.05) in a concentration-dependent manner (Table 1). The fungus M. anisopliae caused the highest percentages of larval mortality in late third larval instar that ranged 15–60% at the 1 × 106 and 1 × 1010 conidia/ml, respectively. The mortality rate appeared to increase by increasing concentration. Similarly, B. bassiana ranked second recording (15–57.50 %) at the same concentrations like M. anisopliae. On the contrary, P. lilacinus caused the lowest percentage of larval mortality ranging 10–17.5%. Interestingly, concentration increase in P. lilacinus treated larvae did not affect the mortality rate (Table 1).

To further select which of the tested fungi is high in pathogenicity, the differences in mortality among EPF at the same concentration were statistically analyzed (Fig. 1). The obtained results revealed no differences in larval sensitivity among the three EPF, at the lowest concentration, 1 × 106 (Fig. 1a). However, at high concentrations, the performances of M. anisopliae and B. bassiana induced higher mortality than P. lilacinusis.

Fig. 1
figure1

Mean percentage mortality (%±SD) in immature stages of Ceratitis capitata treated with different concentrations of Metarhizium anisopliae, Beauveria bassiana, and Paecilomyces lilacinus. a Late third larval instar. b 1-day-old pupae. c 5-day-old pupae. d 8-day-old pupae. Bars with the same letter are not significantly different at p > 0.05

Sub-lethal concentrations; LC10, LC30, and lethal concentrations; LC50 and LC90 of the 3 EPF showed that M. anisopliae ranked first, causing mortality to late third instar larvae followed by B. bassiana. P. lilacinus, which showed the weakest pathogenic activity against the larval stage (Table 2).

Generally, it was recorded that EPF vary in their pathogenicity on insects and other arthropods. For instance, the pathogenicity of four species of EPF: B. bassiana, M. anisopliae, M. flavoviride, and Paecilomyces fumosoroseus, to various developmental stages of Rhipicephalus sanguineus (Acari: Ixodidae) ticks was compared under laboratory conditions. The most virulent isolate, M. anisopliae-108, caused 92–96% mortality (Samish et al. 2001). Similarily, the pathogenicity of 13 isolates of M. anisopliae and 2 isolates of B. bassiana to C. capitata and C. var. rosa fasciventris showed fluctuation in the mortality rates among larvae (Ekesi et al. 2002).

Susceptibility of C. capitata pupae

The EPF M. anisopliae appeared superior in causing pathogenicity recording the highest mean percentages of mortality in 1-day-old pupae. Using the concentrations ranging between 1 × 106 and 1 × 1010 conidia/ml, the mortality rate ranged 35–62.5%, while B. bassiana caused 30–57% pupal mortality. Both fungi increased the mortality in pupae by increasing concentration (Table 1). However, P. lilacinus, showed the least percentages of pupal mortality which ranged (10–15%) without any effect of fungal concentration increase on pupal mortality (Table 1).

The 5-day-old pupae were susceptible to all tested fungi. Metarhizium anisopliae achieved (25 and 77.50%) pupal mortality at the concentrations 1 × 106 and 1 × 1010 conidia/ml, respectively. While B. bassiana treated pupae recorded 30–65% mortality. Unlike to other developmental stages (third larval instar and 1-day-old pupa), P. lilacinus showed slightly more activity at 5-day-old pupae and resulted (15 and 22.50 %) pupal mortality. In 5-day-old pupae, all fungi increased mortality as the concentration increases (Table 1).

Similar pattern to those 5-day-old pupae was obtained while using 8-day-old pupae, showed significant differences (p value < .05) in the mean percentages of mortality among different concentrations. The fungus M. anisopliae showed pupal mortality between 15 and 45% at the concentrations (1 × 106 and 1 × 1010 conidia/ml) while B. bassiana and P. lilacinus caused 22.5–47.5% and 12.5–22.5% pupal mortality, respectively.

Comparing the effect of equal concentrations of EPF on different ages of pupae, the mortality rates were compared at the same concentration (Fig. 1b–d). On 1- and 5-day-old pupae (Fig. 1b, c), the performances of M. anisopliae, B. bassiana, and P. lilacinus, showed similar pattern but the difference between M. anisopliae and B. bassiana and P. lilacinus was clear at all concentrations giving the highest pathogenicity to M. anisopliae followed by B. bassiana and finally P. lilacinus (Fig. 1b, c).

For 8-day-old pupae (Fig. 1d), the pattern of pathogenicity was very similar to that of larvae (Fig. 1a) where there was no differences between all treatments only at the lowest concentration, 1 × 106 (Fig. 1d). However, at the highest concentrations, the performances of M. anisopliae and B. bassiana caused higher mortality than P. lilacinusis. Similar results were obtained when analyzing sub-lethal concentrations; LC10, LC30, and lethal concentrations; LC50 and LC90 of the 3 EPF which also revealed that M. anisopliae ranked first in its pathogenicity to 1-, 5-, and 8-day-old pupae, followed by B. bassiana and P.lilacinus, which showed the weakest pathogenic activity against the mentioned stages (Table 2).

Oreste et al. (2015) studied the interaction between age of puparia (at 2, 4, 6 days old) and fungal strains. They addressed both the emergence of C. capitata adults and the mortality of pupae. They found that the fungal treatments of different B. bassiana strains was higher on 2-day-old puparia (49.16 and 51.33% of mycosed puparia for ATCC 74040 and AL1 strain, respectively), while the rate of mycoses was low and ranged between 39 and 27.16%, when fungal treatments were performed on 4- and 6-day-old puparia. Lozano-Tovar et al. (2013) found significant differences among strains of Beauveria spp. and Metarhizium spp. in the total percentage of non-viable puparia of C. capitata and non-viable puparia showing fungal outgrowth, with percentages ranged from 5.0 to 45.0%. Quesada-Moraga et al. (2006) tested the pathogenicity of 10 strains of B. bassiana and 5 of M. anisopliae against puparia and adults of C. capitata, finding that only 2 strains of B. bassiana and one of M. anisopliae caused mortality higher than 50%, when puparia were immersed in the conidial suspensions. Imoulan et al. (2011) tested several B. bassiana strains against medfly pupae, finding that when insects were exposed to 108 conidia/ml, the adult emergence ranged from 0 to 23.33% after 10 days post-treatment.

Susceptibility of C. capitata flies to entomopathogenic fungi

The three fungal species were pathogenic to the flies; however, it was difficult to identify a clear pattern of mortality either with time after treatments by concentrations of the used fungi (Table 3). Mortality of C. capitata adults by all of the used fungi showed fluctuated increases and decreases with time when compared to control (Table 3). Similar limitation was achieved while calculating the lethal time where the lethal time to kill 25% (LT25), 50% (LT50), 75% (LT75), and 90% (LT90) varied among the three fungal isolates (Table 4).

The fluctuation in mortality lethal time and concentration among adults might be linked to the method of treatment where adults were kept in 0.5 l plastic cage in which only 2 ml of conidial suspension was sprayed. Based on the fact that they can fly away from the contaminated area, adult might avoid infection with the fungi. The red palm weevil adults treated with B. bassiana and M. anisopliae showed different lethal time by changing the spray method between dry powder and aqueous suspension (Gindin et al. 2006). Beris et al. (2013) verified the pathogenicity of several strains of B. bassiana, Isaria fumosorosea Wize–formerly Paecilomyces fumosoroseus (Wize) Brown et Smith and M. anisopliae under laboratory conditions against pupal and adult stages of Mediterranean fruit fly via different exposure routes. Castillo and Moya (2000) had confirmed the susceptibility of adults of C. capitata to infection by several isolates of EPF, especially, M.anidopliae and P. fumosoroseus CG-260, which 6 days after treatments, exhibited similar levels of activity, being significantly more pathogenic than the other fungi. Thus, at the two highest concentrations, non-significant differences were found, while at the lowest concentrations, M. anisopliae was slightly more virulent than P. fumosoroseus CG-260. Ten days after treatment, the mortality caused by the fungi increased, mainly at the three highest concentrations. M. anisopliae and P. fumosoroseus CG260 were the most pathogenic fungi. In general, the speed of mortality of the host is correlated positively with conidial concentration (Fargues and Rodriguez-Rueda 1980). In this work, time–mortality responses could be useful to determine specific clues of fungal–host interactions. The application of conidial preparations to natural soil reduced insect emergence and the adult life span and represents a promising strategy for fruit fly integrated management.

The present findings are in agreement with many works who confirmed the susceptibility of other tephritids to infection with M. anisopliae and B.bassiana (Dimbi et al. 2003; Quesada-Moraga et al. 2006; Ladurner et al. 2008). Current research in controlling fruit fly and other harmful pests is highly focusing on searching for safe biopesticides and other safe alternative methods of control (Ali and Ibrahim 2018; Ibrahim and Ali 2018). Such safe biopesticides as well EPF are believed to serve as promising tools in pest management rather than chemical insecticides.

Conclusion

Entomopathogenic fungi, as soil-borne micro-organisms, are one of the most important agent in biological control programs against C. capitata. Three species of fungi (local strains) were tested against the adults and different immature stages (larvae and pupae) of C. capitata to evaluate their pathogenicity. Our results suggest M. anisopliae and B. bassiana have a great value in its virulence to C. capitata.

Availability of data and materials

All data and materials are available.

Abbreviations

IPM:

Integrated pest management

EPF:

Entomopathogenic fungi

PDA:

Potato dextrose agar

RH:

Relative humidity

ANOVA:

Analysis of variance

LC:

Lethal concentration

LT:

Lethal time

SD:

Standard deviation

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Acknowledgements

The authors are grateful to all technical staff and researchers at the Center of Mycology, Assiut University for supplying fungal strains.

Funding

Plant Protection Research Institute, ARC, Egypt, and Faculty of Science, Assiut University.

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NAS reared C. capitata and put strategy to achieve this work. SMA achieved this investigation. NAS and SMA are the contributors in writing the manuscript. AMAI and AMA revised the manuscript. All authors read and approved the final manuscript.

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Correspondence to Sherihan M. Al-amin.

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Soliman, N.A., Al-amin, S.M., Mesbah, A.E. et al. Pathogenicity of three entomopathogenic fungi against the Mediterranean fruit fly, Ceratitis capitata (Wiedemann) (Diptera: Tephritidae). Egypt J Biol Pest Control 30, 49 (2020). https://doi.org/10.1186/s41938-020-00235-y

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Keywords

  • Ceratitis capitata
  • Entomopathogenic fungi
  • Pathogenicity
  • Fruit fly