How to identify peanut root rot?

The incidence of peanut root rot is the most serious in the flowering and fruiting period. It mainly harms the root of peanut. After peanut infection, there were yellowish-brown infiltrating disease spots in the root neck, and then the disease gradually became dark brown. The main root of the diseased plant is wet rot, the root cortex becomes brown and rotten, it is easy to peel off, there is no lateral root, or the lateral root is few and short, and the main root is like a mouse tail. therefore, peanut root rot is also called "rat tail", which is the most important feature of the disease. When wet, the diseased neck regenerates adventitious roots. The diseased plant is short above ground, the growth is poor, the leaf turns yellow and easy to fall off; the mildly diseased plant wilts during the day and recovers sooner or later; the seriously diseased plant has drooping petiole and the leaves wither and fall off from bottom to top. The diseased plant is short, with less blossom and fruit, and more subjective blighted fruit.