Prevention of corn Curvularia leaf spot in rainy season
Question: A friend calls to say that it is now in the rainy season. At this time in previous years, corn always suffered from Curvularia leaf spot, which affected the corn yield. What should I do to prevent this disease?
Chen Yunqi: The pathogen of Curvularia leaf spot of corn is Curvularia lunata, a fungus that belongs to the genus Fungi of the subgenus Campylobacter. The disease is mainly harmful to corn leaves, but also can invade leaf sheath and temporal lobe. The initial stage of the lesion was water-stained yellowish translucent dots, which gradually expanded to round, oval, or spindle-shaped yellowish lesions. The center had yellow-white or grey-white necrotic areas, and the edges were reddish-brown or dark red-brown. Peripheral green halo. Sometimes multiple lesions become one piece, showing sheet necrosis, severe leaves dead. The seed-setting rate of susceptible plants is very low. The ear of corn is small, the grain is not full, and the number of grains per ear and 1000-grain weight are reduced, which seriously affects the yield and quality of corn.
The Curvularia lunata occurs with winter mycelia and conidia on plant residues. In summer, especially in the rainy season, conidia produced by mycelium spread to corn leaves with air currents and rain. In the corn growing period, multiple re-infections can be completed. Especially when corn grows into a large bell-mouth period, leaves above the ear position, as well as leaf sheaths and temporal lobes are susceptible to disease, causing a disease pandemic.
Control methods
1. Agricultural control. The disease-resistant varieties were selected for rotation cropping, applying base fertilizer, increasing phosphorus and potassium fertilizers, strengthening field management, and strengthening the disease resistance of maize.
2. Chemical control. In the early stage of disease, 10% difenoconazole water dispersible granules can be used for 1500-2000 times, 12.5% ​​diniconazole WP can be used for 1000-1500 times, and 50% isoprenil urea can be used as a wettable powder for 1000-1500. Diluent, 70% mancozeb WP 500 to 800 times, 20% triadimefon (triadimefol) EC 1000 to 1500 times, above a pesticide optional spray, interval 7 to 10 days, even spray 2 ~ 3 times. The above pesticides can be used interchangeably to avoid drug resistance.
We're Professional Supplier Extract Powder manufacturers and suppliers in China specialized in providing high-quality products at low price. We warmly welcome you to buy or wholesale bulk Supplier Extract Powder for sale here from our factory. For a free sample, contact us now.
Supplier Extract Powder,Supplier Extract ,Supplier Powder Manufacturer in China
Shaanxi Kang New Pharmaceutical co., Ltd. , https://www.anabolicsteriod.com