Foliar insecticides for the control of curly top in Idaho sugar beet, 2020

Strausbaugh, C.A. and Wenninger, E.J. (2021) Foliar insecticides for the control of curly top in Idaho sugar beet, 2020. Plant Disease Management Reports. 15. 9 March 2021.

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Abstract

Curly top caused by Beet curly top virus (BCTV) is a widespread disease problem vectored by the beet leafhopper in semiarid sugar beet production areas. Host resistance is the primary defense against this problem, but resistance in commercial cultivars is only low to intermediate. The neonicotionoid seed treatments currently supplement this resistance to provide early season control. In order to identify other management options seven foliar insecticides were screened in 2019 on a commercial sugar beet cultivar approved for production. The plots were arranged in a randomized complete block design with eight replications. A curly top epiphytotic was created by releasing six viruliferous beet leafhoppers per plant at the eight-leaf growth stage on 18 June. Foliar symptoms were evaluated on 10 August and 10 September using a scale of 0-9 (0 = healthy and 9 = dead) in a continuous manner. Curly top symptom development was uniform and no other disease problems were evident in the plot area. The disease pressure in the test was severe with good symptom development in the non-treated checks. Based on visual ratings, root yield, and estimated recoverable sucrose, the insecticide Venom and the Asana check were the only foliar treatment that provided some control of curly top. The yields for all treatments except the insecticide seed treatment check, the Asana foliar check, and the Venom treatment indicate that the cultivar was severely infected during the study. These data show that sugar beet production in areas with curly top would likely suffer considerably without the neonicotinoid seed treatments and the supplemental foliar treatments.

Item Type:	Article
NWISRL Publication Number:	1695
Subjects:	Irrigated crops > Sugarbeet > Curly top Irrigated crops > Sugarbeet > Resistance Irrigated crops > Sugarbeet > Seed treatment Irrigated crops > Sugarbeet Irrigated crops > Sugarbeet > Seed treatment > Insecticide
Depositing User:	Users 6 not found.
Date Deposited:	10 Mar 2021 21:38
Last Modified:	10 Mar 2021 21:38
Item ID:	1733
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/1733