Spatio-temporal variations in wheat aphid populations and their natural enemies in four agro-ecological zones of Pakistan

Faheem, Muhammad; Saeed, Shafqat; Sajjad, Asif; Wang, Su; Ali, Abid

doi:10.1371/journal.pone.0222635

Cited by 12 publications

(8 citation statements)

References 55 publications

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“…Furthermore, there was minimal variation in the weather conditions in the Deciduous Forest zone, probably accounting for the non-relationship recorded between these parameters and the recorded aphid densities. Species abundance is often affected by agroecological barriers, which are usually characterized by differences in physical environments (Shukla, 1990;Faheem, Saeed, Sajjad, Wang, & Ali, 2019). Of the natural enemies reported in this study, the incidence of the hoverfly P. borbonicus was positively related to the densities of L. e. pseudobrassicae in the Coastal Savannah zone and M. persicae in the Deciduous Forest zone.…”

Section: Discussionmentioning

confidence: 64%

Differential effects of weather, plant phenology and predators on the seasonal variation of aphids on cabbage

Forchibe

Fening

Narh‐Madey

et al. 2023

J Applied Entomology

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The aphids Lipaphis erysimi pseudobrassicae (Davis) and Myzus persicae (Sulzer) pose serious threats to the production of cruciferous crops in the tropics. Understanding their population dynamics is important for developing integrated pest management programmes to minimize their damage to crops. This study investigated the effects of climatic factors, natural enemies and plant age on the population dynamics of these pests. The population density of aphids and their natural enemies in 20 cabbage plants, and weather conditions were monitored for five cropping seasons from 2019 to 2021 in two agroecological zones of Ghana (Coastal Savannah and Deciduous Forest zones). The highest population density of L. e pseudobrassicae was recorded in January (dry season) in both agroecological zones, while the highest population density for M. persicae occurred in September (minor rainy season) and August (dry spell) in the Coastal Savannah and Deciduous Forest zones, respectively. The highest aphid densities were noted to occur during periods with low relative humidity and low rainfall. The population density of L. e. pseudobrassicae was significantly negatively related to plant age, air temperature and relative humidity, and positively related to syrphids (Paragus borbonicus) and spiders in the Coastal Savannah zone, while in the Deciduous Forest zone, it was significantly positively related to coccinellids. On the other hand, M. persicae population density was significantly positively related to syrphids and coccinellids in the Deciduous Forest zone. Rainfall negatively affected syrphids in the Coastal Savannah zone, while air temperature positively affected syrphids and negatively affected spiders in the Deciduous Forest zone. Coccinellids had a significant positive relationship with relative humidity in the Deciduous Forest zone. This study provides important insights into the key factors that regulate aphid population densities on cabbage and will support development of timely interventions to manage these pests.

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Section: Discussionmentioning

confidence: 64%

Differential effects of weather, plant phenology and predators on the seasonal variation of aphids on cabbage

Forchibe

Fening

Narh‐Madey

et al. 2023

J Applied Entomology

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“…Poleroviruses spread in nature exclusively by specific aphid vectors in a persistent non-propagative manner [ 7 , 8 , 45 , 49 ]. Thus, we attempted to recover RTIV from infected Asian wild rice plants by four aphid species known to transmit related viruses in cereals: Rhopalosiphum padi , Schizaphis graminum , Sitobion avenae and Metopolophium dirhodum [ 45 , 50 , 51 ]. Aphids were fed on the RTIV-positive wild rice plants for 3 days before they were transferred to seedlings of wildtype O .…”

Section: Resultsmentioning

confidence: 99%

Discovery of aphid-transmitted Rice tiller inhibition virus from native plants through metagenomic sequencing

et al. 2023

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A major threat to rice production is the disease epidemics caused by insect-borne viruses that emerge and re-emerge with undefined origins. It is well known that some human viruses have zoonotic origins from wild animals. However, it remains unknown whether native plants host uncharacterized endemic viruses with spillover potential to rice (Oryza sativa) as emerging pathogens. Here, we discovered rice tiller inhibition virus (RTIV), a novel RNA virus species, from colonies of Asian wild rice (O. rufipogon) in a genetic reserve by metagenomic sequencing. We identified the specific aphid vector that is able to transmit RTIV and found that RTIV would cause low-tillering disease in rice cultivar after transmission. We further demonstrated that an infectious molecular clone of RTIV initiated systemic infection and causes low-tillering disease in an elite rice variety after Agrobacterium-mediated inoculation or stable plant transformation, and RTIV can also be transmitted from transgenic rice plant through its aphid vector to cause disease. Finally, global transcriptome analysis indicated that RTIV may disturb defense and tillering pathway to cause low tillering disease in rice cultivar. Thus, our results show that new rice viral pathogens can emerge from native habitats, and RTIV, a rare aphid-transmitted rice viral pathogen from native wild rice, can threaten the production of rice cultivar after spillover.

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“…Poleroviruses spread in nature exclusively by specific aphid vectors in a persistent non-propagative manner [7,8,36,40]. Thus, we attempted to recover RTIV from infected Asian wild rice plants by four aphid species known to transmit related viruses in cereals: Rhopalosiphum padi (R. padi), Schizaphis graminum, Sitobion avenae and Metopolophium dirhodum [36,41,42]. Aphids were fed on the RTIV-positive wild rice plants for 3 days before they were transferred to seedlings of wildtype O. sativa spp.…”

Section: Recovery Of Rtiv From Persistently Infected Wild Rice Plants...mentioning

confidence: 99%

Discovery of aphid-transmitted Rice tiller inhibition virus from native plants through metagenomic sequencing

Yan

Zhu

Liu

et al. 2022

Preprint

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A major threat to rice production is the disease epidemics caused by insect-borne viruses that emerge and re-emerge with undefined origins. It is well known that some human viruses have zoonotic origins from wild animals. However, it remains unknown whether native plants host new endemic viruses with spillover potential to rice (Oryza sativa) as emerging pathogens. Here, we discovered rice tiller inhibition virus (RTIV), a novel RNA virus species, from colonies of Asian wild rice (O. rufipogon) in a genetic reserve by metagenomic sequencing. We identified the specific aphid vector to transmit RTIV and found RTIV would cause low-tillering disease in rice cultivar after transmission. We further demonstrated that an infectious molecular clone of RTIV initiated systemic infection and causes low-tillering disease in an elite rice variety after Agrobacterium-mediated inoculation or stable plant transformation, and RTIV can also be transmitted from transgenic rice plant through its aphid vector to cause disease. Finally, global transcriptome analysis indicated that RTIV may disturb defense and tillering pathway to cause low tillering disease in rice cultivar. Thus, our results show that new rice viral pathogens can emerge from native habitats, and RTIV, a rare aphid-transmitted rice viral pathogen from native wild rice, can threaten the production of rice cultivar after spillover.

show abstract

Spatio-temporal variations in wheat aphid populations and their natural enemies in four agro-ecological zones of Pakistan

Cited by 12 publications

References 55 publications

Differential effects of weather, plant phenology and predators on the seasonal variation of aphids on cabbage

Differential effects of weather, plant phenology and predators on the seasonal variation of aphids on cabbage

Discovery of aphid-transmitted Rice tiller inhibition virus from native plants through metagenomic sequencing

Discovery of aphid-transmitted Rice tiller inhibition virus from native plants through metagenomic sequencing

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