In the production of onion in Huaning County, Yunnan Province, it is susceptible to purple spot disease and rust. According to many years of investigation: in the rainy and humid weather, the damage caused by purple spot disease is more serious.
The main pest and disease control methods of onion are as follows:
1, purple spot disease: the use of 75% chlorothalonil 600 times solution or 64% anti-virus 矾 500 times liquid spray; can also be used 25% toxic mildew or 65% mancozeb 600 times liquid spray control. Spray once every 10-15 days, even spray 3-5 times.
2, rust: the use of 15% triazolone 1500-2000 times liquid spray control, spray every 10-15 days, even spray 3-5 times.
3, onion hummer: acre of 5% acetamiprid 200 times liquid continuous control 2-3 times, while taking blue plate trapping, 20-25 pieces of blue board using acre, blue board is 20-25 cm higher than the upper part of the onion The insecticidal effect is very good.
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