In the cultivation of beans, there are often symptoms such as small yellow spots or mildew on the leaves, which may be caused by legume diseases. Bean diseases mainly include rust; anthrax; bacterial diseases; gray mold; coal mold; brown spot; black spot; viral disease; root rot. Below, Xiaobian will talk to you about the symptoms and identification of common bean diseases.
Rust
Typical symptoms
Mainly harmful to the blade;
In the early stage of the disease, it is a chlorotic small yellow spot;
Later, there is a sense of bulging, turning yellowish brown;
After the rupture of the diseased part, reddish brown powder was released.
anthrax
Typical symptoms
Mainly harmful leaves, stems, pods;
The leaf spot is reddish brown, the edge is darker in color, and the rupture is later;
The pods are born with brown dots and dark brown in the middle;
When wet, it often overflows with pink viscous material.
Bacterial disease
Typical symptoms
Mainly harmful leaves, stems, pods and seeds;
Leaf tip or leaf edge first develops, producing irregular brown spots;
The stem stalk is slightly sunken, reddish brown, and after a week around the stem, the upper leaves are withered;
The diseased pods have a slight depression and irregular brown spots, and shrink when severe;
When wet, the diseased part overflows with yellow pus.
Gray mold
Typical symptoms
Mainly harmful leaves, flowers, pods;
Leaf spotted plaque lesions, easy to rupture later;
When flowers and pods are infected, they first infect the fallen flowers and then spread to the pods;
When wet, the diseased part will be gray moldy.
Coal mold
Typical symptoms
Mainly harmful to the blade;
Brown spots on the front of the leaves;
In the late stage, there will be a gray black mold layer corresponding to the back position;
In severe cases, the leaves are easy to fall off.
Brown spot
Typical symptoms
Mainly harmful to the blade;
Brown spots on the front and back of the leaves, rude on the edges;
In the later stage, the central part of the lesion is grayish white to grayish brown, and the color of the leaf back is slightly darker;
When wet, the diseased back of the leaf produces gray-black mildew.
Ring disease
Typical symptoms
Mainly harmful to leaves and pods;
The lesions on the leaves or pods are nearly round brown spots with a russet concentric pattern on the surface;
When wet, the diseased part is dark and mildewed.
Viral disease
Typical symptoms
Mainly changed to the blade;
The young leaves are expressed as Mingmai, chlorotic or shrunken, and mosaic;
The thick green blade portion will protrude, the concave image will be pocketed, and the blade will bend downward;
The whole diseased plant is dwarfed, flowering late or easy to fall.
Root rot
Typical symptoms
Mainly damage the roots and stem bases;
The diseased part produces brown spots;
The diseased plant is easy to pull out;
Longitudinally peeling the root of the disease, the vascular bundle turns brown;
After the main root is infected, the ground part is wilting or dead.
The above are the symptoms and identification of common legume diseases compiled by Huinong. I know these legume diseases? Effective identification of legume diseases can promptly find control measures to help beans grow better.
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