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Foliar insecticides for the control of curly top in Idaho sugar beet, 2022

Strausbaugh, C.A. and Majumdar, R. (2023) Foliar insecticides for the control of curly top in Idaho sugar beet, 2022. Plant Disease Management Reports. 17:1. 15 March 2023.

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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 2022 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 15 June. Foliar symptoms were evaluated on 20 July and 15 August using a scale of 0-9 (0 = healthy and 9 = dead). 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 check. The Poncho Beta seed treatment provided better control than all other treatments based on curly top ratings, root yield, and estimated recoverable sucrose (ERS). The Actara, Asana, Transform, and Violacein treatments all reduced curly top ratings compared to the non-treated check, but the control was not adequate to avoid serious reductions in root yield and ERS. These data show that sugar beet production in areas with curly top would suffer greatly without the neonicotinoid seed treatments and supplemental foliar treatments. Additional evaluations will need to be conducted with other insecticides if alternatives to the neonicotinoid (Poncho Beta) chemical class are to be identified for curly top control.

Item Type: Article
NWISRL Publication Number: 1752
Subjects: Irrigated crops > Sugarbeet > Curly top
Irrigated crops > Sugarbeet > Seed treatment
Irrigated crops > Sugarbeet > Seed treatment > Insecticide
Depositing User: Users 11 not found.
Date Deposited: 21 Mar 2023 19:41
Last Modified: 21 Mar 2023 19:41
Item ID: 1791