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dc.contributor.authorTangtrakulwanich, Khanobporn
dc.contributor.authorReddy, Gadi V. P.
dc.contributor.authorWu, Shaohui
dc.contributor.authorMiller, John H.
dc.contributor.authorOphus, Victoria L.
dc.contributor.authorPrewett, Julie
dc.date.accessioned2015-07-08T20:06:56Z
dc.date.available2015-07-08T20:06:56Z
dc.date.issued2014-12
dc.identifier.citationTangtrakulwanich, Khanobporn, Gadi V. P. Reddy, Shaohui Wu, John H. Miller, Victoria L. Ophus, and Julie Prewett. "Developing nominal threshold levels for Phyllotreta cruciferae (Coleoptera: Chrysomelidae) damage on canola in Montana, USA." Crop Protection 66 (December 2014): 8-13. DOI:https://dx.doi.org/10.1016/j.cropro.2014.08.013.en_US
dc.identifier.issn0261-2194
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/9170
dc.description.abstractThe flea beetles Phyllotreta cruciferae (Goeze) and Phyllotreta striolata (F.) (Coleoptera: Chrysomelidae) are serious pests infesting canola (Brassica napus L.; Brassicales: Brassicaceae) in the Northern Great Plains of the United States. In Montana, P. cruciferae is the only flea beetle species that attacks canola during the crop growing stage. Management of P. cruciferae is usually focused on treating adults feeding on canola seedlings, which is the stage most vulnerable to flea beetle damage. In the Golden Triangle area in Montana, canola growers traditionally use seed treatments or calendar based spraying to control P. cruciferae. Here, we compared calendar-based spraying with seed treatment and threshold-based treatment. The experiment treatments included threshold levels (15–20, 25, 45% of leaf area damaged), calendar based sprays (15, 30 and 45 day intervals after plant emergence), seed treatments (imidacloprid), and untreated controls. The trials were done at two locations (Conrad and Western Triangle Agricultural Research Center). We found that calendar-based spraying at a 15-day interval did not differ significantly in yields from threshold-based treatment at 15–20% leaf damage. Also, the seed treatment did not give significantly higher yields compared to calendar-based sprays. A negative correlation was detected between leaf damage and yield in each treatment. Overall, calendar-based and threshold-based treatments were most effective in improving yields. However, treatment made at the threshold of 15–20% leaf area damage is recommended in order to reduce the number of chemical applications and also to reduce the possibility of selecting for resistance in flea beetles.en_US
dc.subjectNominal thresholdsen_US
dc.subjectPlant sciencesen_US
dc.titleDeveloping nominal threshold levels for Phyllotreta cruciferae (Coleoptera: Chrysomelidae) damage on canola in Montana, USAen_US
dc.typeArticleen_US
mus.citation.extentfirstpage8en_US
mus.citation.extentlastpage13en_US
mus.citation.journaltitleCrop Protectionen_US
mus.citation.volume66en_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.identifier.doi10.1016/j.cropro.2014.08.013en_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.collegeCollege of Agriculture
mus.relation.departmentResearch Centers.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.relation.researchgroupWestern Triangle Ag Research Center.


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