The prevention and treatment of sunflowers

The prevention and treatment of sunflowers

Symptom recognition

Sunflower verticillium wilt main phase in a plant, leaf mesophyll part before and after flowering to chlorosis, then the entire leaf mesophyll faded green, yellow between margin and lateral veins, after turn brown. The disease was developed from the bottom up, and the tuber vascular bundle Browning. Onset of all lower leaves dry death, it is middle leaves mottled, serious or die before flowering, both sides when humidity is big leaf or stem can appear white mildew.

Prevention and control methods

(1) the selection of disease-resistant varieties.

(2) reasonable rotation shall have at least three years of rotation period.

(3) strengthen management culture, suitable sowing, reasonable density, increasing under phosphorus, enhance plant disease resistance, clear in time field sick body, source reduction, the incidence of stem to burn in time, prevent the spread of the disease spread.

(4) drug control

(1) the seed treatment: 50% carbendazim wettable powder, 50% methyl sulfur bacteria spirit wettable powder are 0.5% of the amount of seed the seed, or 80% thiram 0.2% wettable powder according to the seed of the seed.

Irrigation: 20 percent of the oil in the oil, 400 times the amount of liquid, and 500 ml per plant.

(3) spraying on the leaf: the early onset, with 50% refund on bacteria, wettable powder 500 times liquid, 50% carbendazim wettable powder 500 times liquid, 70% methyl sulfur bacteria spirit wettable powder 800-1000 times liquid, 64% antivirus alum wettable powder 1000 times liquid, 77% cupric hydroxide wettable powder 400 times liquid, 14% winding copper ammonia wettable powder 250 times liquid, 75% chlorothalonil wettable powder 800 times liquid of spraying on the leaf.