Rice leaf blast refers to rice stalks that are infested by rice blast fungus infection after rice three-leaf stage to rice heading stage. Leaf plaques vary depending on weather conditions, disease resistance, and age of the disease. Let's take a look at the underlying leaf rickets.
Symptoms of leaf rickets:
The typical symptoms of rice leaf mites are “three parts and one lineâ€, that is, the lesions are generally fusiform, the outer yellow halo is poisoned, the inner ring brown necrosis is necrotic, the middle grayish white is the collapse, and the veins at both ends of the lesion become The brown strip is a necrotic line. When the humidity is high, there will be a grayish mildew layer on the back of the lesion.
For rice susceptible varieties, or moderate temperature and high humidity conditions, the lesions are dark green, water-stained, mostly irregular or nearly round lesions, and both sides of the surface will form gray-white mildew, which generally occurs more quickly. When the climatic conditions are not suitable, the lesion will turn into a typical symptom of leaf blast.
In addition, when the disease is affected by adverse weather conditions, it will form a near-circular white spot, and a typical lesion will form later, but if the conditions are appropriate, it will quickly and extensively occur. When leaf mites infect disease-resistant varieties, brown spots are generally formed in the middle of the veins.
Therefore, the prevention and control of rice leaf mites should be mainly prevention, and timely spraying should be carried out when there are sporadic occurrences in the field:
First, preventive measures
Choose disease-resistant varieties, rational close planting, avoid excessive population density, soil testing and formula fertilization, control nitrogen fertilizer, increase potassium fertilizer, etc., pay attention to the field should not be filled with deep water, dry and wet, suitable for soaking of fresh amine before sowing. In addition, three days before transplanting, spraying an agent such as tricyclazole or Chunleitriazole and adding an immunostimulant such as amino oligosaccharide can effectively prevent the occurrence of reduction.
Second, prevention measures
When the field leaves are sporadic, timely use the Fuji No. 80-90 ml, or 32.5% azocilin 40 ml or 75% fentanyl tebuconazole 15-20 g with water 30-45 kg mixed spray For the application, other contraceptive agents such as hexyl pyriolate or isoindole may be used, which occurs 2-3 times and once every 7 days. Pay attention to the alternate use of the pharmacy, and at the same time, it can be combined with the drainage to dry the field, and the effect is better.
The above is about the symptoms and control measures of rice leaf blast. Rice is a crop widely cultivated in China. Therefore, all kinds of diseases in rice should be paid attention to, and rice leaf blast is no exception.
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