کنترل بیولوژیک بیماری مرگ گیاهچه چغندرقند در مزارع جوین

TThe results of the first year showed that the number of healthy seedlings per hectare in 60 days after planting in the biological treatment was 16.70% more than the control, and the yield in the biological treatment was more than doubled compared to the control. In the biological treatment, the number of 60-day healthy seedlings and the yield were calculated as 107,880 seedlings and 13 tons per hectare, respectively. While in the control, the number of healthy seedlings and the yield were estimated at 92440 seedlings and 6 tons per hectare, respectively. By observing the yield of 6 and 13 tons per hectare in the control and biological treatments of the infected field. non-commercial Bahrabad and the low yield of this yield compared to the average yield in the commercial farms of Joyn region during crop years 95 to 98 (47.5 to 60 tons per hectare), re-project in the second year with the aim of making a commercial farm in addition to the contaminated farm and Repeated non-commercial. Thus, in the second year (agricultural year 1998), the implementation of the project was carried out by applying biological treatment and control in two commercial farms (Motahri Farm of Jovin Agriculture and Industry Company) and non-commercial contaminated farms (Bahrabad Farm). The results of the second year showed that there was a 53.17% increase in the number of healthy 60-day-old seedlings per hectare in the contaminated and non-commercial farm of Bahrabad and a two and a half times increase in biological treatment compared to the control. In Bahrabad farm, the number of 60-day healthy seedlings and yield in biological treatment were estimated as 44,760 seedlings and 37 tons per hectare, and in the control as 20,960 and 15 tons per hectare respectively. On the other hand, the results in the commercial farm of Jovin Agriculture and Industry Company (Mothari Farm) showed that there was a 11.43% increase in the number of 60-day-old healthy seedlings per hectare and a 9.68% increase in yield in the biological treatment compared to the control. In Motahari farm, the number of 60-day healthy seedlings and yield in biological treatment were calculated as 65880 seedlings and 41 tons per hectare and in the control as 59120 and 37 tons per hectare respectively. In non-contaminated fields such as Motahari, in biological treatment, despite the relatively low increase of 60-day-old healthy seedlings compared to the control (11.43%) due to the characteristics of T. flavus fungus (plant growth enhancing properties in addition to disease prevention), An increase in the weight of sugar beet tubers and, as a result, a 9.68% increase in yield was observed.