Pay attention to two kinds of sunflower disease prevention and treatment

First, symptom recognition

1. Sunflower rust is an important disease of sunflower. D80%. Leaf, petiole, culm, kwai and other parts of the disease can be formed after the rust-like spore heap. The leaves were infected and the brown pods on the back of the leaves appeared on the back of the leaves as the uredia spores heap. After the surface ruptured, brown powder was scattered, which was the spores of the pathogenic bacteria. The posterior disease department gave birth to many dark brown pods. The black powder, ie, the teliosporus, caused severe early leaf dryness.

2, sunflower brown spot, also known as spot blight. Seedling stage, adult stage can be disease. Cotyledons and seedlings were infected with brownish lesions on the leaves, yellow halos were found on the periphery, and lesions were grayish on the back. The lesions were polygonal in shape when they became infected, brown, and yellow halos, and black spots on the later stages of the lesions, that is, the pathogen conidia. It is rainy and wet, and the lesions are easily peeled off or perforated. The lesions that are heavily diseased are fused and the entire leaves die. Diseased spotted stems and petioles were long and narrow. It is an important disease that is widely distributed in the world.

Second, control advice

1. Sunflower rust This year due to the high precipitation in Erdaobaihe Town, the climatic conditions are conducive to the prevalence of sunflower rust, combined with the expansion of sunflower planting areas in recent years, and the varieties are poorly resistant, resulting in favorable ecological conditions for disease development. Recently, it is suggested that the main planting areas of the villages should take corresponding prevention and control measures for different incidences. At the beginning of the onset, spray 80% dexamethasone 600-800 times with 75-100 liters of water, or spray with 25% triadimefon 1000-1500 times, and use 35-40 grams per mu.

2, sunflower brown spot disease in the autumn when the timely cleaning of the garden, remove the sick leaves, concentrated burning or flooding; promote the application of Japanese enzyme composting compost or compost organic fertilizer; early disease leaves removed, if necessary, can be used more than 50% bacteria Ling wettable powder 1000 times or 50% thiophanate-methyl 1500 spray.

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