Effect of Downy Mildew in Crops

Downy mildew (Plasmopara halstedii (Farlow) Berlese & de Toni) is widely observed years in sunflower planted areas in Trakya region depending on climatic conditions in some years. Although genetically resistant hybrids to downy mildew have just started to plant recently in Turkey, they have been planting many years in European countries. In the study, to determine the situation of downy mildew in Trakya region, enough leaf samples were collected from mildew infested plants in different areas representing complete region. Consequently, a mixture of all different races was constituted and these leaf samples were dried at shadow at 24-48 hours period, and then they were saved in the refrigerator at -80 ºC. Mildew spore solution from these saved plant samples. This spore solution was infested to experimental materials. In the research, HA-89 and 6626-A female lines were found to sensitive to downy mildew and RHA-419, HA-460, RHA-436, RHA-437 and RHA-340 inbred lines were observed as resistant to the disease. As a result, some resistant lines were observed in the early generations and it was determined that these resistant inbred lines could be used as donor lines in Trakya region in mildew resistance research

Downy mildew (Plasmopara halstedii (Farlow) Berlese & de Toni) is widely observed in sunflower planted areas in Trakya region depending on climatic conditions in some years. Although genetically resistant hybrids to downy mildew have just started to plant recently in Turkey, they have been planting many years in European countries. In the study, to determine the situation of downy mildew in Trakya region, leaf samples were collected from mildew infested plants in different areas representing complete region. Consequently, a mixture of all different races was constituted and these leaf samples were dried at shadow at 24-48 hours period, and then they were stored in the refrigerator at -80 oC. Mildew spore solution from these stored plant samples. This spore solution was infested to experimental materials. In the research, HA-89 and 6626-A female lines were found to be to downy mildew and RHA-419, HA-460, RHA-436, RHA-437 and RHA-340 inbred lines were observed as resistant to the dise...

Downy mildew (Plasmopara halstedii (Farlow) Berlese & de Toni) is widely observed years in sunflower planted areas in Trakya region depending on climatic conditions in some years. Although genetically resistant hybrids to downy mildew have just started to plant recently in Turkey, they have been planting many years in European countries. In the study, to determine the situation of downy mildew in Trakya region, enough leaf samples were collected from mildew infested plants in different areas representing complete region. Consequently, a mixture of all different races was constituted and these leaf samples were dried at shadow at 24-48 hours period, and then they were saved in the refrigerator at -80 ºC. Mildew spore solution from these saved plant samples. This spore solution was infested to experimental materials. In the research, HA-89 and 6626-A female lines were found to sensitive to downy mildew and RHA-419, HA-460, RHA-436, RHA-437 and RHA-340 inbred lines were observed as resistant to the disease. As a result, some resistant lines were observed in the early generations and it was determined that these resistant inbred lines could be used as donor lines in Trakya region in mildew resistance research