Document Type : Agricultural Entomology
Authors
1 IRIPP
2 Agriculyure research center of west Azarbaijan province
3 Agriculture and Natural Resource Research and Education Center of Fars Province
4 Faculty member of plant protection in markazi provice
5 Agriculture and Natural Resource Research and Education Center of Esfahan Province
Abstract
One of the most important and damaging pests of this product is cabbage aphid Brevicoryne brassicae L. This research was carried out in eight treatment 1 (7 times of spraying during 7 consecutive weeks from the beginning of the canola stalk, for the absence of pests), treatment 2 (6 times of spraying 1 week after the canola stalk), treatment 3 (5 times of spraying, 2 weeks after from rapeseed stem removal), treatment 4 (4 spraying times, 3 weeks after rapeseed stem removal), treatment 5 (3 spraying times, 4 weeks after rapeseed stem removal), treatment 6 (2 spraying times, 5 weeks after rapeseed stem removal) canola leaves), treatment 7 (1 spray, 6 weeks after canola stalks) and treatment 8 (full presence of the pest, no spraying and only water spray) using imidacloprid SC35 at a rate of two per thousand exposed to cabbage wax aphid feeding They were exposed to natural pollution. The equation and curve of the regression line between the average number of aphids and yields per square meter were calculated. The weight of one thousand seeds per square meter of canola and the amount of damage per aphid were calculated.
The results showed that the maximum mean number of aphids per surface unit (10 cm branch length of the flowering branch) is 367.88±27.88, 439.75±36.13, 187.75±10.10 and 274.00±27.68 respectively in West Azarbaijan, Markazi, Fars and Isfahan provinces on Hydromel, Ahadi, Talaiyeh and Okapi varieties. It causes 37%, 35.5%, 25.1% and 22.9% reduction in rapeseed yield.
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