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Foliar insecticides for the control of curly top in Idaho sugar beet, 2018

Strausbaugh, C.A. and Wenninger, E.J. (2019) Foliar insecticides for the control of curly top in Idaho sugar beet, 2018. Plant Disease Management Reports. 13(CF052). 1 March 2019.

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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 2018 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 19 June. Foliar symptoms were evaluated on 24 July and 5 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 moderately severe with good symptom development in the non-treated check. Based on visual ratings, root yield, and estimated recoverable sucrose, the foliar insecticides provided little or no influence on the control of curly top. However, the yields for all treatments except the insecticide seed treatment check 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. One non-check treatment (Truvia) led to a significant reduction in black bean aphid colonies. This treatment will be investigated further as a potential product that can be recommended for aphid control in commercial crops and for home owners as well.

Item Type: Article
NWISRL Publication Number: 1645
Subjects: Irrigated crops > Sugarbeet > Curly top
Irrigated crops > Sugarbeet
Irrigated crops > Sugarbeet > Seed treatment > Insecticide
Depositing User: Users 6 not found.
Date Deposited: 08 Mar 2019 21:33
Last Modified: 08 Mar 2019 21:33
Item ID: 1689