Beet leafhopper and BCTV strain survey 2022 progress report

Strausbaugh, C.A. and Jackson, Laurie and Vincill, E.D. (2023) Beet leafhopper and BCTV strain survey 2022 progress report. The Sugarbeet. 6 March 2023.

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Abstract

At the request of a sugar beet industry stakeholder, beet leafhopper (BLH) populations in southern Idaho were tracked during the 2020 (4 counties) and 2021 (5 counties) growing seasons in desert areas and sugar beet and dry bean fields in southern Idaho. Samples were collected on a weekly basis from mid-April through mid-September to assess all leafhoppers for population levels and the presence of Beet curly top virus (BCTV) strains. Crop plants from monitored fields were also assessed for the presence of BCTV strains. Once BLH populations in Elmore Co. began increasing in May, they were present in at least double-digit numbers through most of the summer at all sites both years. Thus, BLH numbers at desert sites in other areas were at or near zero, except for Owyhee Co. in 2021 late in the summer. Local weed populations appeared to be the primary source of BLH in crop fields and not desert sites. Two haplotypes (based on cytochrome oxidase gene) dominated the BLH population both years and were present in all areas of southern Idaho. Over the 22-week collection period, the horizontal card averaged 45 to 75% fewer BLH than the vertical card indicating vertical card placement is preferable. In 2020, 42% of the BLH samples were positive for the BCTV coat protein gene and in 2021 67% of the samples were positive. The Worland strain of BCTV was dominant both years in the BLH population, but the BCTV strains found in the plant samples were more of a mix. Phytoplasma has been detected in a few BLH samples, but all plant samples tested to date have been negative. Once all data are collected, the project will establish the BCTV strains for which host plant resistance is needed and the best time for when control of BLH is necessary.

Item Type:	Article
NWISRL Publication Number:	1747
Subjects:	Irrigated crops > Sugarbeet > Curly top Irrigated crops > Sugarbeet
Depositing User:	Users 11 not found.
Date Deposited:	14 Mar 2023 20:08
Last Modified:	14 Mar 2023 20:08
Item ID:	1786
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/1786