The latest Control methods of Maize Seedling Blight

Corn seedling blight is a fungal disease of corn seedling stage. In the early stage of the disease, it often causes the heart leaves of corn seedlings to curl and wilt. Serious cases cause dead seedlings. In recent years, corn seedling blight has an aggravating trend and has become one of the main diseases on corn seedlings. It has a greater impact on corn yield. Let's take a look at the prevention and control methods of corn seedling blight.

harm characteristic

After maize disease, root tip turns brown first, after expanding, root system development is poor or root hair decreases, secondary root is few or absent, primary root is aged, cortex necrosis, root system turns black and brown, and necrotic spots are formed between the first nodes of stem, causing stem water rot, easy to break, leaf sheath also turns brown and cracks. Leaves turn yellow, leaf margin withered, heart leaf curl easy to fold, serious disease appears death, there are a few secondary roots to form weak seedlings. The lightly injured seedlings had no obvious symptoms on the ground, generally the leaf tips of the first to second leaves began to yellow at the 2~3 leaf stage, and gradually developed to the middle of the leaves, and the serious heart leaves gradually withered.

occurrence regularity

Corn seedling blight generally occurs after sowing to early July. In the case of long-term drought, corn after sowing to root period, sudden moderate to heavy rain and soil hardening, resulting in low soil temperature, humidity environment, easy to infect the disease. Low lying, poor soil, clay land, saline-alkali land and the application of corn herbicides in the plot of heavy disease, in addition to low seed quality, too deep sowing is also easy to disease. In the wheat-maize rotation fields, the occurrence of wheat root disease in recent years was serious, resulting in the accumulation of Fusarium moniliforme, Fusarium graminearum and Rhizopus, and the occurrence of summer maize seedling blight was also serious.

prevention measures

1. Select high-quality, disease-resistant varieties, and select corn seeds with large, plump and strong germination potential.

2. Promote formula fertilization and increase farm manure to cultivate strong seedlings, especially pay attention to supplementing phosphorus and potassium fertilizers. Promote root growth, so that plants grow vigorously, in order to improve disease resistance.

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

4, prevention with 1000 times carbendazim plus potassium chloride 2~3 jin irrigation roots.

5. Use 70% thiophanate-methyl 800 times solution, or 20% triadimefon 1000 times, 75% chlorothalonil 1000 times and other pesticides to spray twice (about 7 days between each application).