What disease causes rice leaves to turn red?

Rice can suffer from various diseases at every stage of growth, and the most direct symptom of disease is shown through the leaves; direct changes in the leaves represent the corresponding disease symptoms. Some growers have noticed that during the booting and jointing stages, rice leaves begin to turn red, so what is the cause, what pathogen infection is responsible, or is it a physiological disease? The specific situation is described in detail below.

I. Causes

In fact, red leaves are not caused by just one reason; there are many causes, the common ones being phytotoxicity, low-temperature conditions, and nutrient deficiency; it may also be bacterial leaf streak of rice, bacterial leaf blight, or akiochi caused by potassium deficiency. In summary, the causes of reddening include environmental factors, human factors, element deficiency, and pathogen infection. So the cause is complex and requires careful identification.

II. Improvement Methods

1. Temperature regulation

The main thing with temperature is to avoid low temperatures during the jointing and booting stages. Since it is all open-field cultivation, the only option is to delay sowing, calculate the approximate timing of the growth stages, and based on climate data from past years, let the jointing stage miss the low-temperature period, which can prevent it from happening.

2. Spraying methods

Maintain a good growing environment, minimize disease occurrence, and minimize the use of pesticides. If pesticides must be used, they must be applied at the correct concentration, or the number of applications should not be too many; do not keep using the same pesticide, rotate them. There must be an interval of at least three days between two applications; do not spray frequently. Do not use too high a concentration, as it easily scorches and reddens leaves.

3. Nutrient elements

Nutrition must not be lacking throughout the entire growth period. This is exactly the time to shift from using nitrogen fertilizer to phosphorus and potassium fertilizers, as the plant is about to enter reproductive growth, so it is best to promptly supplement chemical fertilizers, phosphorus and potassium fertilizers. Potassium fertilizer must not be lacking; potassium deficiency mainly causes red leaves.

4. Disease control

At this time the weather is hot and humid, especially in southern regions, where some pathogens suited to this environment multiply in large numbers, so attention must be paid to disease control. For example, shallow irrigation reduces humidity between the rows. In fact, applying more potassium fertilizer can also improve the plant's disease resistance. When necessary, dig drainage channels well; two drainage channels can be dug in the middle of the field.

Rice leaves turning red is mainly caused by various factors, and sometimes by the interaction of multiple factors. When preventing and improving the situation, be sure to identify carefully and find the cause. If truly unclear, you can also try treating it.