|Gallian, John - UNIVERSITY OF IDAHO|
|Camp, Stacey - AMALGAMATED SUGAR CO.|
|Stander, J - AMALGAMATED SUGAR CO.|
Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: March 28, 2006
Publication Date: June 1, 2006
Citation: Strausbaugh, C.A., Gillen, A.M., Gallian, J.J., Camp, S., Stander, J.R. 2006. Influence of host resistance and insecticide seed treatments on curly top in sugar beets [abstract]. Phytopathology. 96:S111. Technical Abstract: Curly top on sugar beets caused by Beet severe curly top virus or closely related strains is a considerable problem in arid growing regions of the western United States. In an effort to supplement host resistance, two insecticide seed treatments, Poncho Beta (60 g ai clothianidin + 8 g ai beta-cyfluthrin/100,000 seed) and Gaucho (45 g ai imidacloprid/100,000 seed), and four sugar beet hybrids varying in resistance to curly top were evaluated for their influence on the control of curly top. Plots were established at two locations in southern Idaho and evaluated for curly top in July, August, and September 2005. Curly top due to natural inoculum and leaf hopper infestations occurred at both locations. Untreated, the four hybrids performed as expected with the fewest curly top symptoms on PM21 and the most on Monohikari. Both insecticide treatments lowered curly top ratings compared to the untreated check, but Poncho Beta reduced symptoms more than Gaucho on the latter two ratings. Based on contrasts, hybrids treated with Poncho Beta had increased yield, sugar content, and estimated recoverable sugar. When considering the yield parameters for only the most resistant hybrids individually, Poncho Beta did not always out perform Gaucho. Poncho Beta provided a level of control that could potentially make susceptible hybrids commercially viable.