Sunflower Case Study

755 Words4 Pages
ABSTRACT: Sunflower is the most important oil crop. Downy mildew, caused by the fungal pathogen Plasmopara halstedii, is one of the major diseases in sunflower that can lead to significant loss of yield, to more than 50%. Breeding for resistance is considered as the most effective method for achievement of low cost and environmental friendly production. Crop rotation helps reduce populations of many important sunflower pathogens in the soil. Most sunflower diseases are caused by pathogens specific to sunflower. The primary approaches for managing diseases of sunflowers are the use of resistant varieties and crop rotation. Additionally, seeds may be treated with fungicides to control fungi that cause seedling diseases. Fungicides are labeled…show more content…
Sunflower is most common and important oil crop in Bulgaria. Sunflower is one of the several plants that are First in North America. The genus Helianthus consist of more than sixty (60) perennial and annual species. Wild sunflower is the first plant. Many diseases, pests and insect infect the cultivated sunflower plants and affect the yield of the plant. The major problem is plant diseases that how we overcome the disease and increase the ¬¬¬¬¬¬¬¬¬¬¬sunflower yield. More than 30 diseases have been identified worldwide which is due to viruses, bacteria and other microorganisms. Breeding for disease resistance is always considering most important task in sunflower plant breeding for…show more content…
This disease also controlled by foliar fungicide. Downy Mildew: This is another disease of sunflower which is also cause by a fungus. The symptoms of the Downy mildew is death of seedling leads to reduced stands in fields, if seedling survive they may be cholotic, and white cottony growth on leaves is present, this infection caused astounded growth of plant and as a result reduced seed production. Plasmopara halestedii is the most common disease of downy mildew. Management: To overcome this problem or disease treat sunflower seeds with appropriate fungicides as we know this disease caused by fungus. Occurrence of mildew strain resistant to Apron XL (mefenoxam) and Allegaince (metalaxyl) seed treatment have been altered the management strategy. The downy mildew strain that is insensitive to mefenoxam and metalaxyl another fungicides azoxystrobin is use on sunflower as seed treatment. Another method to control disease in sunflower is to use tow fungicides at the same time and it is less expensive method. Other methods to control downy mildew is minimize crop rotations and eradication of sunflower. Resistance against plasmopara halestedii is controlled by the dominant P1

More about Sunflower Case Study

Open Document