First, downy mildew (a) symptoms. Is a fungal disease, the performance of the flower bud development process is more obvious, the old leaves first disease, and then spread to young leaves, the beginning of the disease appears green, yellow leaf phenomenon. Leaves dry when dry, mildew layer on the back of the leaves when wet. (b) Control methods. Choose a strong disease-resistant variety. To avoid continuous cropping, the soil should be sun-dried white, and apply appropriate amount of lime to improve. At the beginning of onset, spray 70% Mancozeb WP 600 to 800 times or Metalaxyl 400 to 600 times. Stop using pesticides 10 to 15 days before harvesting.
Second, soft rot disease (a) symptoms. Is a bacterial disease, broccoli occurs in the late growth period when more rain occurs. The lesions are water-stained and gradually soften and rot, resulting in odors; bacteria invade the roots, stems and leaves. (b) Control methods. Avoid continuous cropping with cruciferous vegetables, especially cabbages and cabbages. Strengthen field management and cultivate strong seedlings. Avoid injury and pay attention to drainage after the rain. At the beginning of the disease, spraying streptomycin sulfate, or 72% of Streptomycin WP wettable powder 3000-4000 times, or neophytin 4000 times.
Third, the diamondback moth (a) symptoms. The first-instar larvae can only feed on the leaves and leave a transparent epidermis. The 3rd to 4th instar larvae can form holes in the leaves of the vegetables. In severe cases, the entire leaves are eaten into a net. (b) Control methods. At the beginning of the disease, blacklights are used to seduce the adult. It can also be sprayed with a 500-1000 times solution of Bacillus thuringiensis preparations or a 1000-2000 solution of 50% phoxim EC. Stop using pesticides 10 days before harvest.
Fourth, cabbage caterpillar (a) symptoms. The larvae feed on the leaves, leaving only a layer of transparent epidermis, leaving only the veins remaining. When the flowers are damaged, they are prone to soft rot. The insects also contaminate the flowers and reduce the value of the goods. (b) Control methods. At the early stage of disease, spray with Bt emulsion or 500 to 800 times liquid of the bacterium No.6 liquid of the worm insects, or 1000 times of the 50% phoxim EC, or 3000 to 4000 times of the 20% fenvalerate EC. If it rains after spraying, it should be sprayed. Stop using pesticides 10 days before harvest.
Fifth, vegetable soup (a) symptoms. The damaged plants are severely dehydrated, curled up, yellowed, distorted and deformed. The damage caused by rapeseed meal can also cause soot disease and transmission of viral diseases. (b) Control methods. In the broccoli field, a yellow plate was used to induce lice, and the yellow plate was 8 pieces per acre. Hung gray film strips to avoid embarrassment, film width 12 to 23 cm, 1 meter high. At the beginning of the disease, spray with 40% dimethoate 1000 times or 80% dichlorvos 1000-2000 times in time. Stop using pesticides 15 days before harvest.
Second, soft rot disease (a) symptoms. Is a bacterial disease, broccoli occurs in the late growth period when more rain occurs. The lesions are water-stained and gradually soften and rot, resulting in odors; bacteria invade the roots, stems and leaves. (b) Control methods. Avoid continuous cropping with cruciferous vegetables, especially cabbages and cabbages. Strengthen field management and cultivate strong seedlings. Avoid injury and pay attention to drainage after the rain. At the beginning of the disease, spraying streptomycin sulfate, or 72% of Streptomycin WP wettable powder 3000-4000 times, or neophytin 4000 times.
Third, the diamondback moth (a) symptoms. The first-instar larvae can only feed on the leaves and leave a transparent epidermis. The 3rd to 4th instar larvae can form holes in the leaves of the vegetables. In severe cases, the entire leaves are eaten into a net. (b) Control methods. At the beginning of the disease, blacklights are used to seduce the adult. It can also be sprayed with a 500-1000 times solution of Bacillus thuringiensis preparations or a 1000-2000 solution of 50% phoxim EC. Stop using pesticides 10 days before harvest.
Fourth, cabbage caterpillar (a) symptoms. The larvae feed on the leaves, leaving only a layer of transparent epidermis, leaving only the veins remaining. When the flowers are damaged, they are prone to soft rot. The insects also contaminate the flowers and reduce the value of the goods. (b) Control methods. At the early stage of disease, spray with Bt emulsion or 500 to 800 times liquid of the bacterium No.6 liquid of the worm insects, or 1000 times of the 50% phoxim EC, or 3000 to 4000 times of the 20% fenvalerate EC. If it rains after spraying, it should be sprayed. Stop using pesticides 10 days before harvest.
Fifth, vegetable soup (a) symptoms. The damaged plants are severely dehydrated, curled up, yellowed, distorted and deformed. The damage caused by rapeseed meal can also cause soot disease and transmission of viral diseases. (b) Control methods. In the broccoli field, a yellow plate was used to induce lice, and the yellow plate was 8 pieces per acre. Hung gray film strips to avoid embarrassment, film width 12 to 23 cm, 1 meter high. At the beginning of the disease, spray with 40% dimethoate 1000 times or 80% dichlorvos 1000-2000 times in time. Stop using pesticides 15 days before harvest.
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