Allelopathy studies in weed science in Turkey - a review

Allelopathy involves both inhibitory and stimulatory biochemical interactions between plants. The phenomenon has received great attention since the 1980's all over the world; however, in Turkey, research on allelopathy just started in the late 1980's. Studies have been done with many crops, trees, shrubs and weeds under both laboratory and field conditions to determine their allelopathic potential and its use for weed control. Crops belonging to the Brassica family are the most studied species for allelopathic potential to control weeds. Among the Brassica species, garden radish (Raphanus sativus) has been most studied to control johnsongrass (Sorghum halepense). Allelopathic activity of alfalfa (Medicago sativa) also received some attention. The role of allelopathy in weed interference on crop production was also studied. In conclusion, allelopathy studies should parallel with contemporary studies such as ecological and chemical studies, and an integrated approach should be adopted to fully utilize the applicability of allelopathic plant species to control problem weeds

Case report: concomitant myelodysplasia in a patient with syphilis

9th International Eurasian Hematology Oncology Congress (EHOC) -- OCT 17-20, 2018 -- Istanbul, TURKEYWOS: 000447176600163

Critical period for weed control in direct seeded red pepper (Capsicum annum L.)

Direct seeded red pepper is a cash crop in Kahramanmaraş province of Turkey as well as some other nearby provinces. Weeds are a major constraint in red pepper production. Field studies were conducted to determine critical period for weed control (CPWC) in direct seeded spice pepper in Kahramanmaraş, in 2008 and 2009. The CPWC in red pepper based on a 2.5%, 5% and 10% acceptable yield loss (AYL) was calculated by fitting logistic and Gompertz equations to relative yield data. The CPWC in red pepper was determined from 0 to 1087 growing degree days (GDD) in 2008 and from 109 to 796 GDD in 2009 for 10% AYL after crop emergence in red pepper. For 2.5-5% AYL, the CPWC starts with germination and lasts until harvest. Direct seeded red pepper is very vulnerable to weed competition and weed control programs for direct seeded spice pepper in Turkey should include pre-emergence and residual herbicides. © 2012 The Authors. Weed Biology and Management © 2012 Weed Science Society of Japan

Critical period for weed control in sesame production

Planning effective weed control in cropping systems requires exact appraisal of the weed intensity and duration of their competition with the crops. This 2-year study was carried out in order to determine the critical weed control period in sesame fields. Related and relative crop yields were monitored and analyzed using a four-parametric log-logistic model. We recorded data from weed-free plots and compared these with data from different periods of weed interference. In both the study years, the longer period of weed interference decreased the relative yield of sesame, whereas the yield was increased with increasing duration of the weed-free period. A 51-78.7% decline in sesame yield was noted if the weeds were allowed to compete with the crop from planting to harvest. In the first year, the duration of the critical period for weed control (CPWC) was 177-820 growing degree days (GDD), which corresponded to 14-64 days after crop emergence (DAE), and between 170 and 837 GDD (13-64 DAE) in the second year; this was based on a 5% acceptable yield loss. The results of this study clearly elaborated that maintaining weed-free conditions is compulsory from as early as the second week after the emergence of sesame plants, and this should be maintained at least until the ninth week to avoid sesame yield losses by more than 5%. These findings show that growers can benefit from CPWC to improve weed control in sesame production, including the efficacy of a weed control program and its cost