Foliar insecticides for the control of curly top in Idaho sugar beet, 2021

Strausbaugh, C.A. and Wenninger, E.J. (2022) Foliar insecticides for the control of curly top in Idaho sugar beet, 2021. Plant Disease Management Reports. 16:1. 17 March 2022.

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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 2021 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 22 June. Foliar symptoms were evaluated on 10 August and 10 September 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. Two treatments (Poncho Beta seed treatment and the Scorpion foliar treatment) provided a similar level of control on the second rating and had similar root yield and ERS. The Applaud foliar treatment provided less control based on ratings, but ERS was not significantly different from the Poncho Beta and Scorpion treatments. The foliar insecticide treatments containing Asana or Spear T provided marginal control of BCTV, but these treatments were better than the non-treated check in foliar ratings, root yield, and ERS. The Venom and Ninja + Asana treatments also showed higher root yield and ERS relative to the non-treated check. The remaining treatments were similar to or worse than the non-treated check with respect to sucrose, root yield, and ERS. 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:	1725
Subjects:	Irrigated crops > Sugarbeet > Curly top Irrigated crops > Sugarbeet > Genetics Irrigated crops > Sugarbeet > Resistance Irrigated crops > Sugarbeet
Depositing User:	Users 6 not found.
Date Deposited:	24 Mar 2022 15:20
Last Modified:	24 Mar 2022 15:20
Item ID:	1762
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/1762