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Pathogens: Erwinia carotovora subsp. Carotovora (Jones) Bergey et al. belongs to the prokaryotes, E. eugens, E. carotovora, and Carrot soft decay subspecies. Gram-negative Gram-negative bacteria, facultative aerobic bacilli, short rods, solitary or twin, 0.6 to 0.91.5 to 5.0 micron, weekly flagellate, no spores and decidua. The milky white to grayish white, round or amoeba colony is formed on the gravy agar medium, the growth temperature range is 4~30°C, and the optimum temperature is 25~30°C; bacteria can use various sugars as carbon source to generate gas and can reduce nitric acid. Salt, liquefied gelatin but does not hydrolyze starch. Bacteria live longer in the unrotated tissues of the soil and can continue to harm many plants. Bacteria are spread by rain, irrigation, irrigation water, and insects and are invaded by wounds. Especially the larvae of beetle borers on the young leaves caused damage to the wounds and branches transplanted, peeling the ball, are conducive to invasion and cause rot. Disease conditions, continuous cropping of sick fields, rainfall, soil moisture, dense planting, and large-coverage plots often weigh heavily. Exotic plants are host plants and are extensive. There are widespread incidences of iris in Germany and Shanwei in Australia.
Control methods:
1. Soil disinfection: In order to prevent the occurrence of soft rot in advance, prior to transplanting the potted soil to disinfect the soil, the soil can be sterilized with 0.5% to 1% formalin, about 10g per square meter; also available Chloro-bitter 60--120g/m2 or 70% pentachloronitrobenzene 8-10g/m2 for disinfection.
Used flower pots and contaminated tools should also be cleaned and disinfected with 1% copper sulfate. Usually watering can not be too much, so as to avoid basin soil too wet.
2. Agricultural control: timely cutting off or removing diseased plants; don't injure the plants when planting and transplanting so as to avoid infection; pay attention to drainage during onset, and keep the roots dry so as not to cause root, root and bulb rot.
3. Chemical control: After the onset of disease, spraying streptomycin 1000 times or 150-200 times Bordeaux mixture should be used to control the spread of the disease. At the same time, pests should be promptly controlled to reduce wounds and reduce morbidity.
About the control method of soft rot of appendix
Symptoms: After the leaves of the rhizome endangered, the water-stained discoloration streak appears, spreads and spreads to the rhizomes, and the internal tissues are gray-brown, sticky, soft and rot, and there is odor, leaving the shell of the empty shells behind and the sick leaves wilting. , easily detached from decaying rhizomes. Bulbous appendixes tend to rot in roots and necks.