Occurrence of soil insect pests: insight from classical identification supplemented with DNA barcoding

Nyamwasa, Innocent; Li, K.; Yin, Jing; Zhang, Shuai; Kajuga, Joëlle; Hategekimana, A.; Waweru, Bancy; Li, H.

doi:10.1080/09670874.2016.1211771

Cited by 10 publications

(10 citation statements)

References 57 publications

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“…The dominant white grub genera were Anomala and Hoplochelus species as per morphological and DNA comparisons. But identification to species level was not possible in most cases due to lack of comparative information in DNA databases and difficulties to morphologically discriminate larval instars (Nyamwasa et al, 2017).…”

Section: Target Insect Pestsmentioning

confidence: 99%

“…white grubs known to damage vegetables and tubers in Rwanda (Nyamwasa et al, 2017). These included Anomala as well as Hoplochelus species (Coleoptera: Scarabeidae).…”

Section: Target Insect Pestsmentioning

confidence: 99%

“…They were identified using morphological and molecular DNA comparison methods (Nyamwasa et al, 2017). They were collected from ploughed fields after sweet or Irish potatoes in Akanyandoli in Nyamagabe district in September 2014 as well as in February and March 2015.…”

Section: Target Insect Pestsmentioning

confidence: 99%

“…In some cases, up to 60 grubs were found per square metre (Nyamwasa et al, 2017). Those included Copris, Oniticellus, Onitis, Onthophagus, Pachysoma, Anomala, Lepadoretus, Adoretus, Cyclocephala, Pycnoschema, Hoplochelus, Maladera, Trochalus, Lepiserica species and Melolonthini genera from Rwanda, but probably there are even more.…”

mentioning

confidence: 99%

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Management of white grubs (Coleoptera: Scarabeidae) with entomopathogenic nematodes in Rwanda

Kajuga

Hategekimana

Yan³

et al. 2018

Egypt J Biol Pest Control

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White grubs are largely unsolved problems in vegetable and tuber production in East Africa. Novel Rwandan as well as international entomopathogenic nematodes (EPNs) were screened in nine laboratory bioassays and two small-scale field trials in 2014 and 2015. Soil-based laboratory bioassays revealed that all EPNs were able to infect Anomala graueri larvae (Coleoptera: Scarabeidae), although a relatively high number of infective juveniles were needed. Rwandan EPNs were as infectious as their corresponding international strains. At 100 infective juveniles per larva, the Heterorhabditis bacteriophora strains (Rwanda14-N-C4a and international H06) as well as the international Steinernema carpocapsae All caused 18 to 22% grub mortality within 7 days compared to the control. At 1000 infective juveniles, both H. bacteriophora strains as well as the Rwandan S. carpocapsae RW14-G-R3a-2 killed 34 up to 58%. The Rwandan Steinernema RW14-M-C2a-3 least performed in the bioassays (2 to 6%). In two Irish potato fields, the into-soil-applied 1 × 10 9 infective juvenile Steinernema RW14-M-C2b-1 per hectare reduced 29 ± 33% and 96 ± 3% of grubs within 30 and 60 days, respectively. About 1 up to 2.5 × 10 9 infective juvenile Steinernema longicaudum X7 per hectare reduced 77 up to 85% of grubs until day 30, respectively, and 82 up to 95% until day 60. Avermectin + Chlorpyrifos tuber coatings reduced 39% of grubs, and Fipronil + Chlorpyrifos reduced 27%, whereas handpicking did not help much. In conclusion, at least Steinernema RW14-M-C2b-1 and S. longicaudum X7 are promising for managing white grubs in tuber production, this is at a rate of at least 1.5 × 10 9 EPNs per hectare, but H. bacteriophora RW14-N-C4a needs further field research. Findings will support the biocontrol product development in Rwanda, including registration if any would be needed for native macrobial biocontrol agents.

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Section: Target Insect Pestsmentioning

confidence: 99%

“…white grubs known to damage vegetables and tubers in Rwanda (Nyamwasa et al, 2017). These included Anomala as well as Hoplochelus species (Coleoptera: Scarabeidae).…”

Section: Target Insect Pestsmentioning

confidence: 99%

Section: Target Insect Pestsmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Management of white grubs (Coleoptera: Scarabeidae) with entomopathogenic nematodes in Rwanda

Kajuga

Hategekimana

Yan³

et al. 2018

Egypt J Biol Pest Control

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“…For instance, organic practices, such as major inputs of decomposing organic matter and the use of agroforestry trees, are anecdotally blamed for creating a favorable microclimate for soil‐dwelling insects, including providing suitable sites for the oviposition and larval development of crop pests (King , Nyamwasa et al. ). This is because the annual production of crop residues (3 Gt), which are often left on or returned to the field by farmers for the purpose of soil conservation (Scheunemann et al.…”

Section: Introductionmentioning

confidence: 99%

Overlooked side effects of organic farming inputs attract soil insect crop pests

Nyamwasa

Zhang

et al. 2020

Ecological Applications

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Sun. 2020. Overlooked side effects of organic farming inputs attract soil insect crop pests. Ecological Applications 30(4):Abstract. Organic farming has been praised for many sound reasons, but there are some negative effects of organic practices. Research on the interactions between soil insect pests and organic farming practices is still scarce, although such interactions might sometimes lead to severe crop damage. Here, we explore the influences of organic farming inputs and key host crops on the oviposition behavior of soil insect pests likely to infest crops. We also shed light on the factors driving this behavior and analyze 4 yr of data from an on-farm investigation. Our study offers clear support to the idea that decomposing organic matter and legume crops affect oviposition behavior and provides evidence that butyric acid and 1-hexanol are major attractants. The results suggest that poor management or returning decomposing organic matter to the field is risky. The silver lining, however, is that oviposition behavior can be disrupted by the identified key attractants to benefit crop protection.

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Transition challenge to organic agriculture: A course for advancing belowground insect pest management

Nyamwasa

Zhang

Sun

et al. 2020

Applied Soil Ecology

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Occurrence of soil insect pests: insight from classical identification supplemented with DNA barcoding

Cited by 10 publications

References 57 publications

Management of white grubs (Coleoptera: Scarabeidae) with entomopathogenic nematodes in Rwanda

Management of white grubs (Coleoptera: Scarabeidae) with entomopathogenic nematodes in Rwanda

Overlooked side effects of organic farming inputs attract soil insect crop pests

Transition challenge to organic agriculture: A course for advancing belowground insect pest management

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