Density of Sitobion avenae population on the herbicide-treated plants was lower in relation to control plants, during booting and flowering of triticale and higher during milk and dough maturity. Decrease of total and soluble nitrogen content, and increase of protein nitrogen within tissues of winter triticale Bogo cv. after application of Chwastox D 179 SL, was stated at early growth stages. During next growth stages, increase of analyzed nitrogen forms occurred. This tendency was supported up to dough maturity, when nitrogen content achieved control level.
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