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Evaluation of resistance of canola genotypes to cabbage aphid (Brevicoryne brassicae L.)
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Abstract: (4879 Views) |
| Cabbage aphid (Brevicoryne brassicae L.) is a serious pest of canola (Brassicae napus L.) in the world. Host plant resistance is considered as a useful approach, and is recommended for its control. Therefore, resistance of twenty one canola genotypes to cabbage aphid was evaluated . The experiment was arranged in a split plot in time using complete raondomized blocks design with three replications under field conditions in West Azerbaijan province in two successive cropping seasons (2005-2007). Genotypes and five sampling dates were considered as main and sub plots, respectively. Aphid infestation occurred naturally. The first aphid infestation occurred in mid May in 2005-2006 and late May in 2006-2007 cropping seasons. With decrease in rainfal and increases in air temperatures in June, the rate of aphid infestation in the field increased. Combined analysis of variance showed significant (p≤0.01) effects of growing season, genotype and sampling times. Rate of infestation at first cropping season was greater. The highest infestation was recorded on 29 May in 2006 and 4 June in 2007. However, aphid infestation decreased in last samplings, as crop approached physiological maturity. Canola genotypes Modena, Sunday, Opera, Sinatra, Sahara, Okapi and Zarfam with < 4 infestation index were classified as resistant where ARG-91004, Milena, Orient, ARC-2, SLM046, ARC-5 and Talent with 4-6.5 infestation indices classified as moderate resistant, and Celisius, Elite, Dexter and Ebonite with 6.5-9 infestation indices grouped as moderate susceptible. On the other hand, Geronimo, Olpro and Licord with > 9 infestation indices were identified as susceptible group. |
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| Keywords: Canola, Cabbage aphid and (Brevicoryne brassicae L.). |
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Full-Text [PDF 410 kb]
(1875 Downloads)
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Type of Study: Scientific & Research |
Subject:
Special
Received: 2015/02/23 | Accepted: 2015/02/23 | Published: 2015/02/23
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