Journal of Entomology (2007) 4, 225-230

N. Demirel and W. Cranshaw (2007)
Evaluation of plant yield responses to artificial infestations of Lygus elisus (Van Duzee) and Nysius raphanus (Howard) on spring canola
Journal of Entomology 4 (3), 225-230
Abstract: A two-year study was conducted to evaluate the relationship of plant yield responses to artificial infestations of the Pale Legume Bug (PLB) and False Chinch Bug (FCB) on spring canola in Colorado, USA. Yield losses with both insect species were greater at early flower stages infestations than at early pod stages infestations. A significant yield reductions were caused by 8 PLB/head at early flower stages and 16 PLB/head both stages of IMC204 and 16 PLB/ head at early flower stages of IMC205. Significant yield losses in 2001 were resulted in 40 FCB/head at early pod stages of IMC204. However, yield losses in 2002 were significantly higher at early flower stages than early pod stages. A 20 and 40 FCB/head resulted in 72 and 85% yield losses comparing with 0FCB/head on the cultivar IMC204. In addition, the cultivar IMC205 had 79% yield losses by 40 FCB/head. In conclusion, the spring canola yield responses varied among PLB and FCB/head and their stages.
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Database assignments for author(s): Nihat Demirel

Research topic(s) for pests/diseases/weeds:
damage/losses/economics

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Lygus elisus	Rape/canola (Brassica napus)	U.S.A. (SW)
	Nysius raphanus	Rape/canola (Brassica napus)	U.S.A. (SW)