Published in Scientific Papers. Series B, Horticulture, Vol. LXIII, Issue 1
Written by Zarya RANKOVA, Miroslav TITYANOV, Argir ZHIVONDOV
The study on the effect of applying the soil herbicides Metofen (metolachlor + oxyfluorfen) and Pledge 50 WP (flumioxazin) on the vegetative habits of yellow plum seedling rootstocks and the plumcot cultivar 'Standesto’ in a nursery was carried out in the period 2010-2012 at the Fruit Growing Institute of Plovdiv. Treatment with the herbicides was applied in the second half of March, immediately after sowing the seeds and before the beginning of vegetation, in a second-year nursery field. The herbicides provided a full control of weed infestation and the efficient herbicide post-effect lasted for 3.5-4 months. Visual symptoms of phytotoxicity expressed as a light chlorosis, were observed in the plants treated with the higher rate of Metofen - 2.40 l/ha. Strong phytotoxicity and death of whole plants was observed after treatment with Pledge 50 WP. In the second-year nursery neither visual symptoms of phytotoxicity, nor an obvious suppression of the grafted tree development was observed in the variants treated with the herbicides. In the second-year nursery, the application of Metofen (1.20-2.40 l/ha) or Pledge 50 WP (80.0 g/ha) could be recommended for weed control.
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