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Published in Scientific Papers. Series B, Horticulture, Vol. LXIII, Issue 2
Written by Nesho NESHEV, Mariyan YANEV, Anyo MITKOV, Marieta NESHEVA, Tonyo TONEV

In the growing season of 2018, a field pot experiment with the pumpkin (Cucurbita pepo L.) hybrid ʻPrinceʼ F1 was conducted. In the trial, the selectivity of soil herbicides was evaluated. The variants of the trial were: 1. Untreated control; 2. Dual Gold (960 g/l S-metolachlor) - 1200 ml/ha; 3. Dual Gold - 1200 ml/ha; 4. Stomp New (330 g/l pendimethalin) - 4000 ml/ha; 5. Stomp New - 5000 ml/ha; 6. Spectrum (720 g/l dimethenamid-P) - 800 ml/ha and 7. Spectrum - 1400 ml/ha. The selectivity of the herbicides was reported by 9-score phytotoxicity scale of EWRS on the 7th and on the 14th day after germination (0 - no damage, and 9 - complete crop destruction). The earliest germination was found for the untreated control – 6 days after sowing, and for the plants of treatment 5 germinated last - 12 days after sowing. For variant 2 the phytotoxicity was score 0 and on both evaluation dates. For variants 4 to 9 the phytotoxicity was from score 2 to score 4 on the first reporting date, but on the second date, the phytotoxicity reached lethal scores of 8 to 9. The earliest flowering time was reported for the control, while the latest flowering time was found to be for treatment 3-10 days after the control. At the end of the vegetation, the control plants were the longest - 3.09 m, and the shortest was the pumpkins from treatment 3-2.46 m. The control had the highest number of fruits - 2.40 per plant.

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