Towards area‐wide control of <i>Bactrocera invadens</i>: prospects of the sterile insect technique and molecular entomology

Ogaugwu, Christian

doi:10.1002/ps.3691

Cited by 4 publications

(4 citation statements)

References 45 publications

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“…In response to enormous losses incurred in the horticultural agro-industry, programs aimed at managing fruit damaging Tephritidae have been implemented worldwide, albeit with variable success. Some of the strategies that have been used widely include chemical control [ 11 , 12 ], orchard sanitation [ 13 , 14 ], baiting techniques [ 15 , 16 , 17 , 18 ], sterile insect technique [ 19 , 20 , 21 , 22 ], male annihilation technique [ 18 , 23 , 24 , 25 ], entomopathogenic fungi [ 26 , 27 , 28 ] and use of parasitoids [ 29 , 30 , 31 ] among others.…”

Section: Introductionmentioning

confidence: 99%

Interactions between Two Parasitoids of Tephritidae: Diachasmimorpha longicaudata (Ashmead) and Psyttalia cosyrae (Wilkinson) (Hymenoptera: Braconidae), under Laboratory Conditions

Ndlela

Mohamed

Azrag

et al. 2020

Insects

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The braconid wasp, Diachasmimorpha longicaudata (Ashmead), was introduced in Kenya from Hawaii for classical biological control of the invasive tephritid, Bactrocera dorsalis Hendel. Following reports that D. longicaudata had formed new associations with Ceratitis cosyra, laboratory experiments were conducted to assess the interaction between the introduced and the native parasitoid of C. cosyra; Psyttalia cosyrae (Wilkinson) under three scenarios: B. dorsalis only, C. cosyra only and mixed populations of the two species. Parasitoids were introduced to the host as sole, sequential and simultaneous releases. Host searching and probing events were five times higher for D. longicaudata than P. cosyrae with both hosts. Total parasitism was highest (78%) when D. longicaudata was released alone on C. cosyra, compared to 20% for P. cosyrae released on the same host. Releases of P. cosyrae on B. dorsalis resulted in 0% parasitism, compared to 64% parasitism by D. longicaudata. Specific parasitism for P. cosyrae was three times higher when P. cosyrae was released first in sequential releases on C. cosyra compared to when it was released after D. longicaudata. These findings suggest that the two parasitoids can both suppress C. cosyra but B. dorsalis acts as a reproductive sink for P. cosyrae. Our findings should form the basis of field investigations where options are much wider for both parasitoids.

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Section: Introductionmentioning

confidence: 99%

Interactions between Two Parasitoids of Tephritidae: Diachasmimorpha longicaudata (Ashmead) and Psyttalia cosyrae (Wilkinson) (Hymenoptera: Braconidae), under Laboratory Conditions

Ndlela

Mohamed

Azrag

et al. 2020

Insects

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“…Many control strategies have been recommended and used to reduce the population size of this pest in southern Africa, including bait sprays and male annihilation technique, application of bio-pesticides such as Metarhizium anisopliae, fruit bagging, and orchard sanitation (Ekesi & Lux 2006;Manrakhan et al 2012;Ogaugwu 2014). The potential for use of SIT against this pest has also been raised.…”

Section: Introductionmentioning

confidence: 99%

MarkingBactrocera dorsalis(Diptera: Tephritidae) with Fluorescent Pigments: Effects of Pigment Colour and Concentration

Manrakhan

Weldon

2017

African Entomology

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Daylight fluorescent pigment powders are frequently used to self-mark tephritid flies that are released in sterile insect technique programmes and for studies on their population ecology, movement and behaviour. This study was conducted to determine the effects of pigment colour and dose in marking the Oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae). Six pigment colours (Astral Pink 1, Blaze 5, Stellar Green 8, Lunar Yellow 27, Comet Blue 60 and Invisible Blue 70) were applied to pupae at doses of 0, 2, 4, or 6 g/l. Under laboratory conditions, pigment colour had a small but significant effect on the number of partially emerged and deformed adults; the fewest of these were observed when flies were marked with Astral Pink 1. Pigment concentration, on the other hand, had no effect on adult emergence, partial emergence, deformed adults and mortality on the last day of eclosion. There was no significant effect of pigment colour on adult survival under laboratory and semi-field conditions. Under laboratory conditions, however, there was an effect of pigment concentration on adult survival depending on pigment colour. Visibility under an ultraviolet light and persistence of marks was significantly affected by pigment colour and concentration when observed under laboratory conditions, but not under semi-field conditions. Regardless of colour or dose, pigments used in the study were visible for at least 14 days, but began to fade by 21 days after adult eclosion. To mark B. dorsalis under temperate, warm summer African conditions, all pigment colours tested in this study may be applied at 2-4 g/l pupae. Recaptures of marked and released flies may be underestimated as the flies age.

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“…In Senegal, local factors are at play that may shape control programme design: (i) wild mango trees, smallholder farms and export orchards are located side by side, and (ii) huge differences in farmers’ capacity to invest in control measures result in differences in the degree of infestation that undermine individual efforts. Hence, an effective area‐wide pest management strategy is needed (Ogaugwu, 2014).…”

Section: Introductionmentioning

confidence: 99%

Understanding Bactrocera dorsalis trapping to calibrate area‐wide management

Chailleux

Thiao

Diop

et al. 2021

J Applied Entomology

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Knowing the dispersal of released insects and estimating the size of field populations are keys to the successful implementation of area‐wide management (AWM) programmes based on the sterile insect technique (SIT), as they determine the release strategy of sterile males. Mark–release–recapture (MRR) is a common method used to estimate field populations and spatiotemporal dynamics. However, the extent to which the pest is attracted to lures is often difficult to identify, thereby biasing extrapolation to movement patterns and population size. We performed MRR experiments on the Oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae), in a fruit‐growing area in Senegal. Methyl eugenol and protein baits were used to trap males and females, respectively. After studying the suitability of marking B. dorsalis with fluorescent pigments at the laboratory, two releases of marked sterile flies were organized in the centre of an organic mango orchard, first in the late mango fruiting stage and second in the fruit setting stage. Traps were placed symmetrically along a 250 and 500 m radius from the release point. A very small fraction of the released individuals was recaptured: 0.45% in the first release and 3.08% in the second. Trapping of both sterile and wild flies was completely anisotropic. Sterile flies were mostly trapped at a relatively short distance (250 m) from the release point, in the first two days. Male trapping using methyl eugenol was highly effective, whereas the response of females to food bait traps was low. The direction of the wind was the main driver of recapture, with flies heading upwind. The results underline the importance of taking the odour plume around the traps into account when estimating populations, and the heterogeneous spread of the wild population in the landscape for the set‐up of the release strategy of sterile insects for SIT‐based AWM.

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Towards area‐wide control of Bactrocera invadens: prospects of the sterile insect technique and molecular entomology

Cited by 4 publications

References 45 publications

Interactions between Two Parasitoids of Tephritidae: Diachasmimorpha longicaudata (Ashmead) and Psyttalia cosyrae (Wilkinson) (Hymenoptera: Braconidae), under Laboratory Conditions

Interactions between Two Parasitoids of Tephritidae: Diachasmimorpha longicaudata (Ashmead) and Psyttalia cosyrae (Wilkinson) (Hymenoptera: Braconidae), under Laboratory Conditions

MarkingBactrocera dorsalis(Diptera: Tephritidae) with Fluorescent Pigments: Effects of Pigment Colour and Concentration

Understanding Bactrocera dorsalis trapping to calibrate area‐wide management

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