Control Methods and Technical Key Points for Peanut Web Blotch
Peanut web blotch, also known as brown stripe disease and cloud-pattern blotch disease, often occurs mixed with leaf spot disease, and can cause early defoliation of peanut leaves, severely affecting peanut yield. I. Disease occurrence pattern The disease mostly begins during the flowering stage, with the peak period from pod setting to maturity, mainly damaging leaves, initially producing circular or irregular...
Peanut web blotch, also known as brown stripe disease and cloud-pattern blotch disease, often occurs mixed with leaf spot disease, and can cause early defoliation of peanut leaves, severely affecting peanut yield.
I. Disease occurrence pattern The disease mostly begins during the flowering stage, with the peak period from pod setting to maturity, mainly damaging leaves. Initially, circular or irregular dark brown small spots appear along the main vein, with a chlorotic halo around the spots. Later, irregular brown spots with a net-like margin appear on the upper leaf surface, and small chestnut-brown dots are visible on the diseased areas. During continuous rainy weather, the spots on the leaf surface are larger and dark brown, while spots on the leaf underside are less obvious and light brown; in severe cases, the spots merge. Under dry conditions, the spots tend to crack and perforate. Once leaves are infected, they are highly prone to falling off.
II. Control methods At the early stage of disease onset, use 70% mancozeb wettable powder at 500-600 times dilution, 75% chlorothalonil wettable powder at 700-800 times dilution, 64% sandofan wettable powder at 500 times dilution, 70% phosethyl-Al and mancozeb wettable powder at 500 times dilution, or 80% pencozeb wettable powder at 600 times dilution, spraying once every 10-15 days for 2-3 consecutive sprays.