The common diseases of peanut diseases include stalk rot, root rot, leaf spot, and rust.
1, stem rot
Symptoms: Cotyledons cotyledons dark brown, dry rot, after the petiole spread to the base of the stem into a yellow-brown water-soaked lesions, and finally into a dark brown rot, late onset, first in the base of the stem or the main lateral branch of the water dip disease The spots are brownish-brown and dark brown. The aboveground parts are wilting and dead.
Symptoms: Cotyledons cotyledons dark brown, dry rot, after the petiole spread to the base of the stem into a yellow-brown water-soaked lesions, and finally into a dark brown rot, late onset, first in the base of the stem or the main lateral branch of the water dip disease The spots are brownish-brown and dark brown. The aboveground parts are wilting and dead.
1, stem rot
Symptoms: Cotyledons cotyledons dark brown, dry rot, after the petiole spread to the base of the stem into a yellow-brown water-soaked lesions, and finally into a dark brown rot, late onset, first in the base of the stem or the main lateral branch of the water dip disease The spots are brownish-brown and dark brown. The aboveground parts are wilting and dead.
Symptoms: Cotyledons cotyledons dark brown, dry rot, after the petiole spread to the base of the stem into a yellow-brown water-soaked lesions, and finally into a dark brown rot, late onset, first in the base of the stem or the main lateral branch of the water dip disease The spots are brownish-brown and dark brown. The aboveground parts are wilting and dead.
1, stem rot
Symptoms: Cotyledons cotyledons dark brown, dry rot, after the petiole spread to the base of the stem into a yellow-brown water-soaked lesions, and finally into a dark brown rot, late onset, first in the base of the stem or the main lateral branch of the water dip disease The spots are brownish-brown and dark brown. The aboveground parts are wilting and dead.
Symptoms: Cotyledons cotyledons dark brown, dry rot, after the petiole spread to the base of the stem into a yellow-brown water-soaked lesions, and finally into a dark brown rot, late onset, first in the base of the stem or the main lateral branch of the water dip disease The spots are brownish-brown and dark brown. The aboveground parts are wilting and dead.
Symptoms: Cotyledons cotyledons dark brown, dry rot, after the petiole spread to the base of the stem into a yellow-brown water-soaked lesions, and finally into a dark brown rot, late onset, first in the base of the stem or the main lateral branch of the water dip disease The spots are brownish-brown and dark brown. The aboveground parts are wilting and dead.
Control methods: stalk rot is mainly caused by seed borne pathogens, even for serious disease, early crop disease, so a reasonable rotation should be implemented, seeds should be fully dried before storage, sowing before the broadcast, seed selection, without mildew, Poor seed quality, good seed disinfection, 50% carbendazim seed dressing 0.3% seed dressing.
Root rot
Symptoms: The base of the stem is water-soaked, yellow-brown, and the plants are short. The leaves dry up from the bottom up, and the main lateral roots turn brown and rot. In the later period, only the main roots of brown shrinking are left. Control methods: a reasonable rotation, strict seed selection, drying seeds, seed dressing 0.3% of 50% carbendazim seed dressing, early onset with 50% carbendazim 1000 times the whole field spray.
Symptoms: The base of the stem is water-soaked, yellow-brown, and the plants are short. The leaves dry up from the bottom up, and the main lateral roots turn brown and rot. In the later period, only the main roots of brown shrinking are left. Control methods: a reasonable rotation, strict seed selection, drying seeds, seed dressing 0.3% of 50% carbendazim seed dressing, early onset with 50% carbendazim 1000 times the whole field spray.
Symptoms: The base of the stem is water-soaked, yellow-brown, and the plants are short. The leaves dry up from the bottom up, and the main lateral roots turn brown and rot. In the later period, only the main roots of brown shrinking are left. Control methods: a reasonable rotation, strict seed selection, drying seeds, seed dressing 0.3% of 50% carbendazim seed dressing, early onset with 50% carbendazim 1000 times the whole field spray.
3, leaf spot (mainly including brown spot, black spot)
Symptoms: The brown spot is round, dark brown, and larger. There is a yellow halo on the outer edge of the lesion and a gray mold in the late stage. The spot is round, dark brown and there are no yellow halos around the lesion. The lesion is smaller than brown spot. Control methods: a reasonable rotation; selection of disease-resistant varieties; high-temperature and rainy July and August is the key period for the control of leaf spot, early onset can be sprayed 50% carbendazim 800 times or 75% chlorothalonil wettable powder 600 times Liquid or 70% mancozeb 800 times, spray once every 15 days, spray 2-3 times.
4, flower rust
Symptoms: The bottom lobe first begins to occur. The leaves produce yellow freckle, small in shape, surrounded by a very narrow yellow halo, and after the epidermis dehisces, rust-colored powders are scattered. In severe cases, the leaves turn yellow and dry off.
Control methods: At the beginning of the disease, 75% chlorothalonil 600 times solution or 25% Fennin 500 times solution field spray.
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