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English :
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Influence of some agricultural practices on infestation of canola, Brassica napus (L.) with the cabbage aphid, Brevicoryne brassicae (Linn.) (Homoptera, Aphididae) and yield losses of three canola genotypes in Upper Egypt
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Arabic :
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(تأثير بعض العمليات الزراعية على إصابة نباتات الكانولا بمنّ الكرنب Brevicoryne brassicae فى مصر العليا مع تقدير الفقد فى المحصول لثلاثة تراكيب وراثية)
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| Abstract |
Effects of four sowing dates (1st October, 15th October, 1st November and 15th November), three nitrogen fertilization levels (30, 45 and 60 kg/fed.) and two potassium fertilization levels (24 and 48 kg/fed.) on infestation of canola plants Brassica napus (L.) with the cabbage aphid, B. brassicae werw studed. In addition, yield losses of three canola genotypes due to aphid infestation were estimated at Shandaweel Agric. Res. St., Sohag Governorate, Upper Egypt during 2004/2005 and 2005/2006 growing seasons. Obtained results indicated that infestation with B. brassicae increased by delaying sowing dates during both seasons. The effect of planting dates 1st Oct., and 15th Oct., exhibited the lowest rate of infestation with B. brassicae during both seasons. Infestation with B. brassicae significantly increased by increasing nitrogen fertilization levels during both seasons. On the contrary, infestation with B. brassicae significantly decreased by increasing potassium fertilization levels during both seasons. The results of interactions among the different treatments, sowing dates x nitrogen fertilization levels, sowing dates x potassium fertilization levels, nitrogen x potassium fertilization levels and sowing dates x nitrogen levels x potassium levels had a significant effect on the population density of B. brassicae during both seasons. Also, interactions between the early sowing date (1st Oct.) x N level (30 kg/fed.), the early sowing date (1st Oct.) x K level (48 kg/fed.), N level (30 kg/fed.) x K level (48 kg/fed.) and the early sowing date (1st Oct.) x N level (30 kg/fed.) x K level (48 kg/fed.) recorded the lowest aphid population density during both seasons. In spite of the treatments 1st Oct. x 30 kg N/fed. and 48 kg K/fed. achieved the lowest aphid infestation during both seasons, so according to recommendations of the Ministry of Agriculture, they gave low yield. Therefore, the treatments 15th Oct. x 45 kg N/fed. and 48 kg K/fed. were suitable for giving lower aphid infestations and high yield at the same time. There was a highly significant positive correlation between aphid numbers and yield loss of three canola genotypes during 2005 and 2006 seasons and there were insignificant differences among the three genotypes during both seasons.
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| Publication year |
2007
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| Pages |
271-279
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| Organization Name |
Plant Protection Research Institute (PPRI)
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| City |
الجيزة
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| serial title |
لكلية الزراعة – جامعة القاهرة
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| Author(s) from ARC |
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AGROVOC
TERMS |
Brassica napus.
Brevicoryne brassicae.
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| Publication Type |
Journal
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