In the early stage, the leaves had small brown depressions and then expanded into round or irregular spots. In severe cases, gangrene occurred in the center of the spots.
① reasonably close planting, increasing light, improving ventilation and drainage conditions.
② when cultivating strong seedlings, do not move the plants frequently to avoid human injury and disease.
③ cut off the diseased leaves and smear the wounds on the leaves with chlorothalonil or carbendazim 1000 fold solution.
④ once a week, tolbutine methyl or carbendazim 1000 fold solution was sprayed.
The host range is very narrow, and it is transmitted from the contact process of shrimps with poliomyelitis, but the harm is very serious, which is easy to cause destructive damage and difficult to eradicate.
① & nbsp; is a healthy plant ramet.
In order to prevent mechanical infection, it is better to disinfect the cutting tools.
[! -- [if! Supportlists] -- > ③ the last operation of the infected plant, isolation and destruction.
In the early stage, bacteria invade the leaves or heart leaves to produce water stains, which expand rapidly and contain more water. In the later stage, stink occurs. The diseased leaves turn yellow and fall off, and the whole plant dies of soft rot. The disease spreads rapidly and must be prevented and treated as soon as possible.
① improve growth conditions, increase ventilation, reduce temperature and humidity;
② cutting off the susceptible part, applying antibiotic powder and not watering for a week can prevent the spread of the disease.
③ spray once a week with 1000 times streptomycin solution, 500 times thiol mixture or Bordeaux solution.
The tip of the leaf produces small black spots, which gradually expand into irregular spots. The periphery of the spots forms dark brown, and the middle is light gray brown. When it is serious, it spreads the whole leaf, and finally withers and leaves.
(1) excise the diseased leaves and spray with Thiophane methyl or haoshengling 1000 fold solution;
② the susceptible plants should be sheltered from rainwater or suspended from watering to prevent the disease from aggravating.
③ spray 1000 times of haoshengling solution once a week to prevent infection.
