Increasing In-Row Spacing Enhances Potato Virus Y and Potato Leafroll Virus Spread in Potato

Davis, Jeffrey A.; Radcliffe, Edward B.; Ragsdale, David W.; MacRae, Ian V

doi:10.1007/s12230-015-9462-8

Cited by 3 publications

(2 citation statements)

References 40 publications

(44 reference statements)

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“…Furthermore, clearing immediately surrounding 'open' plants resulted in higher than normal attraction of alates, resulting in alatae densities on open plants well above the mean field density. This was probably a consequence of 'edge' or 'bare ground' effects, which are often observed in other aphid species (Davis et al, 2015(Davis et al, , 2009Irwin et al, 2007)…”

Section: Exclusion Studymentioning

confidence: 96%

Predators and alate immigration influence the season-long dynamics of soybean aphid (Hemiptera: Aphididae)

2018

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The identification of key species within multi-predator assemblages suppressing agricultural pests is paramount to the incorporation of predators into pest management plans. Generalist predators have strong impacts on population growth of soybean aphids (Aphis glycines, Hemiptera: Aphidae) in North America, but their relative influence may vary seasonally, and potentially interact with immigration of alate aphids following initial field colonization. Here we present the results of a season-long study in Minnesota that used cage manipulations to estimate weekly impacts of predation on field populations of soybean aphids, while concurrently quantifying alate aphid and predator densities. We used generalized linear models based on field level aphid and predator counts, and aphid counts on caged and uncaged experimental plants, to show that Harmonia axyridis (Coleoptera: Coccinellidae) was negatively associated with A. glycines abundance, even under alate immigration levels associated with aphid outbreaks, suggesting potential regulation of aphid populations. In contrast, two other common predators, Coccinella septempunctata (Coleoptera: Coccinellidae) and Orius insidiosus (Hemiptera: Anthocoridae), did not show patterns of association with aphid dynamics. We also show that A. glycines populations only have significant positive associations with the number of immigrating alatae on uncaged experimental plants that had higher alate densities than the field average. The negative effect of H. axyridis on aphid populations was also observed on uncaged experimental plants, suggesting that even high levels of alate aphid immigration did not disrupt predator suppression. These results add to the growing body of evidence demonstrating that even low numbers of certain generalist predators can effectively suppress pest populations in agroecosystems. In particular, our findings suggest that the abundance of both H. axyridis and alate aphids are critical to soybean aphid seasonal dynamics.

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Section: Exclusion Studymentioning

confidence: 96%

Predators and alate immigration influence the season-long dynamics of soybean aphid (Hemiptera: Aphididae)

2018

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“…The risk of virus transmission by an increase in aphid vector numbers can be reduced through adjustment of planting and harvesting dates to avoid peak vector activity 47,70 , which is region specific 30,39,67 . However, this strategy is dependent on aphid monitoring systems being in place.…”

Section: Planting and Harvesting Datesmentioning

confidence: 99%

Potato virus Y and Potato leafroll virus management under climate change in sub-Saharan Africa

Krüger

Waals

2020

S. Afr. J. Sci.

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Potato has increased in importance as a staple food in sub-Saharan Africa, where its production is faced with a multitude of challenges, including plant disease development and spread under changing climatic conditions. The economically most important plant viruses affecting potatoes globally are Potato virus Y (PVY) and Potato leafroll virus (PLRV). Disease management relies mostly on the use of insecticides, cultural control and seed certification schemes. A major obstacle in many sub-Saharan Africa countries is the availability of disease-free quality seed potatoes. Establishment and implementation of quality control through specialised seed production systems and certification schemes is critical to improve seed potato quality and reduce PVY and PLRV sources. Seed could be further improved by breeding virus-resistant varieties adapted to different environmental conditions combined with management measures tailored for smallholder or commercial farmers to specific agricultural requirements. Innovative technologies – including more sensitive testing, remote sensing, machine learning and predictive models – provide new tools for the management of PVY and PLRV, but require support for adoption and implementation in sub-Saharan Africa.

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Straw mulch increases potato yield and suppresses weeds in an organic production system

Genger¹,

Rouse

Charkowski³

2017

Biological Agriculture & Horticulture

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Increasing In-Row Spacing Enhances Potato Virus Y and Potato Leafroll Virus Spread in Potato

Cited by 3 publications

References 40 publications

Predators and alate immigration influence the season-long dynamics of soybean aphid (Hemiptera: Aphididae)

Predators and alate immigration influence the season-long dynamics of soybean aphid (Hemiptera: Aphididae)

Potato virus Y and Potato leafroll virus management under climate change in sub-Saharan Africa

Straw mulch increases potato yield and suppresses weeds in an organic production system

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