Effect of nitrogen fertilization on flea beetle (Phyllotreta cruciferae) and cabbage seedpod weevil (Ceutorhynchus obstrictus) injury and crop yield in dry land canola.

Citation metadata

From: Phytoparasitica(Vol. 47, Issue 5)
Publisher: Springer
Document Type: Report; Brief article
Length: 381 words

Document controls

Main content

Abstract :

Keywords: Nitrogen; Seed treatment; Flea beetle; Seedpod weevil; Dry land Abstract: Nitrogen (N) availability is an important factor affecting the canola (Brassica napus L.) yield. While N fertilization is commonly used to enhance the yield and quality of canola, it is also known to influence the incidence of insect pests in the crop. The flea beetle Phyllotreta cruciferae (Goeze) and the cabbage seedpod weevil, Ceutorhynchus obstrictus (Marsh), are two economically important pests of canola in the northern Great Plains of the United States. This study investigated the effects of N fertilization (0, 56, 112 and 168 kg/ha) with or without insecticide seed treatment application on P. cruciferae and C. obstrictus injury levels, canola seed yield, and quality in replicated field trials at the two locations (Conrad and Sweet Grass) of north central Montana. The study showed that N fertilization had no influence on P. cruciferae and C. obstrictus injury levels, regardless of the study location or sampling date. However, insecticide seed treatment application significantly influenced P. cruciferae injury ratings at the both locations. In Conrad, insecticide-treated plots had significantly lower injury levels at the four leaf, pre-flower, and pod formation stages but without an effect at the cotyledon stage of canola plants when compared with untreated control plots. Similarly, in Sweet Grass, injury levels were significantly lower in insecticide-treated plots from cotyledon to pre-flowering stages but not at the pod stage of canola plants. In contrast, insecticide seed treatment had no impact on pod infestation rates by C. obstrictus at either location. Insecticide seed treatment, averaged over all the N rates, improved canola seed yield and quality parameters compared to the untreated plots. Author Affiliation: (1) grid.423088.5, 0000 0000 9197 8231, Centre for Innovation, Olds College, 4500 -- 50th Street, Old, AB, T4H 1R6, Canada (2) grid.4391.f, 0000 0001 2112 1969, Hermiston Agricultural Research and Extension Center, Oregon State University, 2121 South 1st Street, Hermiston, OR, 97838, USA (3) grid.41891.35, 0000 0001 2156 6108, Department of Research Centers, Western Triangle Agricultural Research Center, Montana State University-Bozeman, PO Box 656, 9596 Old Shelby Road, Conrad, MT, 69425, USA Article History: Registration Date: 27/09/2019 Received Date: 14/08/2018 Accepted Date: 27/09/2019 Online Date: 21/11/2019 Byline: Shabeg S. Briar (1), Govinda Shrestha (2), Anamika Sharma (3), John H. Miller (3), Gadi V. P. Reddy (3)

Source Citation

Source Citation   

Gale Document Number: GALE|A607850449