Salvia miltiorrhiza root rot symptoms
The main roots of salvia miltiorrhiza.In the early, the most began to make the damage hair root, root, causing them to brown rot, and then gradually spread to the root, until the entire root rot, the roots of skins in black.To continue with the root rot, can cause the ground stem leaf gradually wither, plants die in the end.At this point if pull out strain can be found taproot in black upper and lower part of stem, and disease is slightly concave;Longitudinal department at brown on the vascular bundle.
Salvia miltiorrhiza root rot disease condition and pathogenesis regularity
Bacteria optimum growth temperature of 27-29 degrees, but the most susceptible geothermal 15 to 20 degrees.Germs, mainly in the sick body and overwintering in the soil, can survive more than 10 years;Legacy in the soil, therefore, the sick body has become the main source of infection, bacteria through the rain, spread, such as irrigation water intrusion from the wound and natural hole hazards.The disease is a typical high temperature and high humidity diseases.High temperature and rainy, the soil humidity is big, heavy soil, low-lying water, hoe root damage, serious field susceptible underground pests.May start to see, especially the long drought rain often unexpected.
Salvia miltiorrhiza root rot disease
Generally may start to see, until October, during the high temperature and rainy in more low-lying stagnant water.
Salvia miltiorrhiza root rot of prevention and cure
Different stubbles, varieties, climate, field management and so on all can affect danshen root rot occurred, therefore prevention and control of danshen root rot to adopt comprehensive prevention and control measures.
1, pay attention to selecting breeding materials.Artificial cultivated salvia miltiorrhiza in recent years, mainly chose salvia miltiorrhiza production using seed seedling transplanting, effectively solve the asexual reproduction of the traditional old root problem, in spite of is the foundation of the prevention and control of danshen root rot.
2, disinfection treatment before planting seedlings.Before planting seed soaking root.With 50% 50% carbendazim or mildothane 800 times liquid dipping root treatment plant after 10 minutes to dry.
3, strict selection planting plots.Choice is high and dry, well drained loam and silty loam field planting, ensure good water filter and air permeability;Had better have 10-15 degrees slope topography, such as flat, high ridge ditch cultivation, prevent water.
4, strengthening cultivation management.Sounds the weather and soil humidity is bigger, timely row scarification, loose soil, increase soil porosity, which can effectively prevent and reduce the occurrence of danshen root rot.Strain out in a timely manner, also found that treatment of quicklime and disease.
5, the rotation low-toxin chemical.Reasonable rotation, inhibits the accumulation of soil bacteria, particularly with the onion garlic vegetables rotation effect is better.
6, chemical control.Sounds the weather after spraying sterilization agent for prevention in time.During the onset of 50% with 50% carbendazim 800 times liquid or mildothane 1000 times liquid filling root, irrigation fluid volume of a piece of 250 ml, 7 to 10 days to fill again, 2-3 times in a row.Also can use 70% mildothane 500 times liquid or 75% chlorothalonil 600 times liquid, spray once every 10 days, even spray 2-3 times, pay attention to the jet stem base.
