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Organic Mulch Increases Insect Herbivory by the Flea Beetle Species, Disonycha glabrata, on Amaranthus spp.

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Department of Natural Resources and Environmental Design, North Carolina Agricultural & Technical State University, Greensboro, NC 27411, USA
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Department of Animal Science, North Carolina Agricultural & Technical State University, Greensboro, NC 27411, USA
*
Author to whom correspondence should be addressed.
Insects 2020, 11(3), 162; https://doi.org/10.3390/insects11030162
Received: 26 January 2020 / Revised: 28 February 2020 / Accepted: 28 February 2020 / Published: 3 March 2020
Amaranth (Amaranthus spp.) is an increasingly high-valued niche vegetable crop among small organic growers in North Carolina, due to its increasing demand among diverse immigrant groups. Production is however hampered by insect pests such as the flea beetle (FB), Disonycha glabrata (Coleoptera: Chrysomelidae), that cause significant yield reduction. Chemical insecticides are generally applied for pest control despite their known risks to health and the environment. Integrated pest management (IPM), which is a cost effective and environmentally friendly approach is still under-exploited in vegetable production by small growers. We studied IPM approaches, suitable for organic production of amaranth by screening nine amaranth varieties for resistance to the flea beetle (FB), D. glabrata, grown with, and without, mulch. D. glabrata population was 60% higher in plots with mulch compared to plots without. The amaranth varieties Molten fire and Green Callaloo recorded the lowest and the highest beetle population commensurate with low, and high leaf damage, respectively. Conversely, leaf yields in the mulched plots were 50% less than recorded in the zero-mulch counterpart, with Green Callaloo variety recording the lowest. These findings will serve as building blocks for a sustainable pest management plan that is appropriate for organic production of Amaranthus spp. in North Carolina. View Full-Text
Keywords: Amaranth; flea beetle; Disonycha glabrata; organic; integrated pest management; mulch Amaranth; flea beetle; Disonycha glabrata; organic; integrated pest management; mulch
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Vorsah, R.V.; Dingha, B.N.; Gyawaly, S.; Fremah, S.A.; Sharma, H.; Bhowmik, A.; Worku, M.; Jackai, L.E. Organic Mulch Increases Insect Herbivory by the Flea Beetle Species, Disonycha glabrata, on Amaranthus spp.. Insects 2020, 11, 162.

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