The main symptoms
Panax notoginseng causes the stems, leaves, flowers, fruits, and roots of P. notoginseng plants to be killed, but the damage to stems, leaves, and flower shafts is heavier. After the roots were damaged, they were brown and rot, and they gradually rotted. The temperature in Sanqi Garden is high, the humidity is high, the plants are too dense, the fertilization is improper, the shade sheds are uneven, the disease spreads quickly, and the damage is aggravated.
Control methods
1. Use disease-free seedlings to disinfect the seedlings: Use 1:2500 dilution of dexamethasone or carbendazim + new high fat film to achieve disinfection.
2. Strictly choose the land: Sanqi Park should generally choose wasteland, avoid continuous cropping, and especially avoid continuous cropping with peanuts. It can be used for more than 3 years with non-host crops such as corn to reduce the amount of field bacteria.
3, to strengthen field management: timely removal of the central diseased plants, diseased leaves, roots and weeds, and burned together for fertilizer use. Proper close planting to control field light transmittance. Strengthen water and fertilizer management, so that seedlings strong disease resistance. In addition to the application of basal fertilization, it is necessary to spray medicinal herbs root Daling to improve their own disease resistance.
4. Chemical control: The test showed that the mixed enzyme of daisammonium and zein (1:300) and the new high-fat film all had better control effect on this disease.
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