Have you noticed leaf scorch at the tip of rambutan (Nephelium lappaceum) trees grown in your backyard? Leaf necrosis is a disease that afflicts those who buy and grow rambutan seedlings with great desire.
What is leaf necrosis disease in Rambutan plant?
Leaf necrosis is a specific or classic symptom of Potassium deficiency. Potassium plays a central role in the maintenance of photosynthesis and related processes. Leaf necrosis is more marked during dry seasons.
How can you recognize it leaf necrosis?
The leaves of the rambutan trees scorch gradually at the apex and edges. It is often observed to exhibit severe scorching of the old leaves on the lower branches. Scorching which starts at the apex gradually spreads to the center of the leaf and mid vein. In severe cases, defoliations (falling off) of the affected leaves occur.
What are the reasons for leaf necrosis?
- Potassium deficiency in the soil
- Inadequately drained soil
- Low soil moisture content
- Excessive application of fertilizers
- High salinity in the soil
- Water deficit in leaves
Is there any solution for leaf necrosis?
Yes, there is. Adequate irrigation and addition of potash fertilizer help effectively control leaf necrosis. Although balanced fertilizer application is important, potash fertilizers should not be depleted.