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Second, using "EM original dew" mixed insecticidal liquid to control Lepidoptera larvae. After adding 1 pound of 30 °C hot water to 1 pound of brown sugar, add 1 pound of 60 °C white wine, 1 pound of mature vinegar, 1 pound of EM original dew, and add 5 pounds of well water into the plastic bucket. Tighten the lid after the fermentation. When the above mixture ferments sweet and sour flavours, one of them can be mixed with 500 parts or 600 parts of water to prevent and control 1 to 5 instar larvae. The rate of death in the 3-4 days after administration is more than 85%.
In addition, it is also possible to use 30% flavescens insecticide 600-700 times, or 15% Duban Anda insecticide 3000-3500 times, or 20% to get rid of 2000-3000 times wettable powder spray, the best The medication time can be given throughout the day before the evening or on cloudy days.
Third, the downy mildew disease can be used 72% Kelu, 72.2% pelicol WP 600-800 times or 75% Zn WP 500-600 times liquid.
Bacterial soft rot or bacterial leaf spot black rot may be 30% copper phthalocyanate or 50% banban net wettable powder 400-500 times, or 72% agricultural Streptomyces spp. 4000-5000 times prime, or 77% can kill the Champions and other wet bactericides control.
Fourth, dry heart disease of Chinese cabbage can be used in the seedling period to the heart of the package with 1% manganese sulfate or calcium hydroxide spray 3-4 times, spray once every 7-8 days.
Do a good job in comprehensive prevention of diseases and pests in autumn vegetables
First, the main pests of cruciferous vegetables are Lepidoptera larvae, such as Plutella xylostella, Pieris rapae (hanging ghost), Brassica japonica, Beet armyworm and so on. According to the above insect pest adults have special phototaxis characteristics of light, frequency vibration type insecticidal lamp is used to control adult insects, a lamp can prevent and cure more than 40-50 acres of vegetable fields, use black sky light, and turn off the light of dawn, can reduce The amount of eggs dropped by adults in the field was over 70%, and the number of mu was reduced by 3-4 times.