First, the cause of the occurrence of white spikes?
1, pest white spike. In rice booting stage or heading and flowering stage, stems or stalks are bored or gnawed between the nodes by the stem borer, and the dead plants are caused before heading and cause white spikes after heading.
2, disease white spike. The diseases causing rice white panicles include rice blast disease (stem pods, ear blast, grain pods, etc.) and bacterial leaf blight. For example, the stem borer of rice blast disease can cause the whole panicle not to be filled with pulp to form white panicles, and the ear stem can form branch stem lesions, which can whiten some of the panicle granules and lead to empty shell pods. When the bacterial blight is severe, the stem stems and branch stems produce brown streaks, causing the stem and stem stems to die, forming pods producing white spikes.
Second, the cause of the sharp red tip?
The reason why leaves turn red during booting is mainly due to the parallel high temperature weather in this stage of growth. The transpiration of plant leaves is intense under hot, sunny and hot weather, and physiological water shortages are prone to occur. In addition, under high temperature conditions, strong irrigation may cause the root system of rice to be in a flooded anaerobic soil environment for a long time, and the root system will turn yellow and black due to lack of oxygen and eventually lose its vitality. As a result, plant nutrient absorption has created obstacles that eventually lead to physiological potassium deficiency, and yellowing or browning of the leaves are symptoms.
Control methods:
1, water management. Alternating wet and dry, each time only shallow water irrigation, the field can not see the water and then poured into shallow water, repeated cycle operation can be.
2. Apply some potassium-containing fertilizers in time, such as foliar spray of 0.2-0.3% potassium dihydrogen phosphate solution or 0.5% potassium nitrate solution to relieve illness and slow down the functional leaf lifespan and improve the photosynthetic efficiency of leaves. To promote grain filling and fruit setting purposes.
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