Corn madness is a sudden disease, a potential dangerous disease affecting corn production. The pathogen often enters the corn leaf formed by zoosporangia germination or enters the corn leaf from the stomata through the stomata. Expansion, through the sheath into the stem, parasitic at the stem end, and then developed to the young leaves. The zoosporangia produced on the diseased plants during the growing season can be re-infested by air flow and rain splash. The pathogen can infect a variety of grass crops and weeds such as corn, wheat, rice, sorghum, etc., and corn infected by mad top disease is generally not strong. The symptoms and prevention measures are now introduced as follows:
First, the symptoms
1. When the diseased seedling height is about 30 cm, the tiller is formed from 6 to 8 leaves, sometimes 6 to 10 tillers, but the leaves are narrow, the texture is tough, the leaves are light, the heart leaves are yellow, and the upper leaves Twisted, shrunk or rolled into a tube shape, the heart leaf can not be unfolded, the surface of the leaf sheath is scorpion-like, and the heavy ones die, resulting in a lack of seedlings.
2. Tasmania leaves. All tassels are abnormally hyperplasia, and all or part of the normal inflorescence becomes metamorphic lobule, and the leaflets are clustered. The metamorphic florets are twisted and shrunk into a mass, which is mad-topped. Like the hedgehog, it cannot produce normal male flowers.
3. After the female flower is infected, the surface is more normal, but the ear is thicker and longer, the stalk is thicker and thicker, and the tip of the stalk is metamorphosed into small leaves and clustered at a 45° angle. The thickness of the cob is uneven, and most of the disease is Shortened, dwarfed, deformed ears, no filaments. The inside of the ears is all eucalyptus leaves, and the ears are multi-segmented. The whole ear is bamboo-like, which is not strong, which seriously affects the yield and quality of corn.
4. The upper leaves and heart leaves are tightly wound, severely twisted into irregular lumps, or cattle tails, and the plants do not tassel.
5. The plants are mild or severely dwarfed, the upper leaves are clustered, the leaf sheaths are stalk-like, the leaves are narrowed, some of the diseased plants are mad, the heads are light and the plants are easily broken, resulting in reduced yield.
Second, prevention measures
1. Strengthen quarantine work. Selection of resistant varieties, it is strictly forbidden to introduce and introduce from epidemic areas, and pay attention to rotation with non-grass crops such as bean crops.
2. Chemical dressing control. Before planting, use 25% metalaxyl WP 200-300 g for seed dressing, dry mix and wet mix. When mixing wet, the agent should be prepared into a liquid and then mixed.
3. Strengthen field management. In particular, it is necessary to strengthen the field management during seedling stage, improve the matching of internal and external ditch systems, improve the drainage and waterlogging capacity of the field, and prevent water accumulation in the field during the seedling period. It is best not to plant corn in low-lying water-prone fields. Temporarily loosen the soil, increase the application of organic fertilizer, and improve soil fertility. After the corn is harvested, the diseased parts of the affected field are completely removed and destroyed to prevent the spread of the bacteria in the field.
4. Do a good job in chemical control. At the beginning of the disease, every 667 square meters (1 mu) is sprayed with fine mist with 60% Mn Zn-Zn wettable powder 100g and 50 kg water, or sprayed with 90% E-phosphorus WP 400 times.
Dehydrated Garlic Granules,Dehydrated Organic Garlic Powder,Cooking Using Garlic Powder,Natural Pure Dehydrated Garlic Powder
shandong changrong international trade co.,ltd. , https://www.cragriculture.com