Control methods of Maize Seedling Blight

Maize seedling blight is a kind of fungal disease in maize seedling stage, which often causes curl and wilting of corn seedling leaves at the initial stage, and causes dead seedlings in serious cases. In recent years, maize seedling blight has become one of the main diseases on maize seedlings and has a great impact on maize yield. let's take a look at the control methods of corn seedling blight.

Hazard characteristics

After the disease of maize, the root tip turns brown at first, and after expansion, the root system develops poorly or the root hair decreases, the secondary root is few or none, the primary root is aging, the cortex is necrotic, the root system turns dark brown, and necrotic spots are formed in the first node of the stem, which causes the stem to be flooded and easy to break, and the leaf sheath also turns brown and cracked. The leaves turn yellow, the leaf edges become scorched, the heart leaves curl easily, the serious ones die, and a few secondary roots form weak seedlings. The shoot of the lightly injured seedlings had no obvious symptoms. Generally, the leaf tips of the first to second leaves began to turn yellow at the 2nd and 3rd leaf stage, and gradually developed to the middle of the leaves, and the severe heart leaves gradually withered and wilted.

Occurrence regularity

Maize seedling blight usually occurs from sowing to early July. In the case of long-term drought, during the period from sowing to rooting, the soil is hardened by sudden heavy rain, resulting in an environment of low soil temperature and high humidity, which is easy to be infected with the disease. The disease is serious in the land with low-lying, barren soil, clayey soil, saline-alkali land and the application of corn herbicides. In addition, the disease is easy to occur if the seed quality is not high and the sowing is too deep. In the fields with wheat-maize as the main rotation, the serious occurrence of wheat root disease in recent years led to the accumulation of pathogens such as Fusarium moniliforme, Fusarium graminearum and Fusarium graminearum, and the occurrence of summer corn seedling blight was also serious.

Prevention and cure measures

The main results are as follows: 1. Select high-quality and disease-resistant varieties, and choose maize seeds with large and full grains and strong germination potential.

2. Popularize the formula fertilization and increase the application of farm manure to cultivate strong seedlings, especially pay attention to the supplement of phosphorus and potassium fertilizer. Promote root growth, make plant growth exuberant, in order to improve disease resistance.

3. Strengthen ploughing management, reduce the use of herbicides, hoe in time, and enhance soil permeability.

4. Irrigation root with 1000 times carbendazim and potassium chloride 2kg for prevention.

5. Choose 70% carbendazim 800x solution, or 20% triadimefon 1000 times, 75% chlorothalonil 1000 times and other pesticides for 2 times (the interval between each application is about 7 days).