Corynespora leaf fall disease in rubber

Corynespora leaf fall disease in rubber

This Corynespora disease causes leaf fall leaf fall continuously throughout the year so that plant growth is compromised, not even death can be tapped on the rubber plant . This disease can also occur in nurseries and budwood gardens . Cause of this disease is by fungus Corynespora Cassiicola .

The symptoms caused by this disease are :

• Corynespora primarily attacks the leaves , both young plants and in older plants .
• The attack begins with patches of brown / black especially in the bones of the leaf . Spotting then developed following bones are more delicate leaf that looks like a thorn / fishbone
• The leaves are sick dry , turn brown and fall , especially when the attack began on the main stems or leaves .
• Young twigs are attacked will be broken , dried and eventually die .

Several factors influence this disease are :

• The development of leaf diseases Corynespora affected by weather , topography , age , condition of the plant , and the plant species or clones .
• In the wet climate regions usually experience severe attacks . On damp or cloudy weather , with the rainy weather that is not too high , but evenly throughout the day , as well as the air temperature is approximately 26-29 degrees Celsius , thereby helping the state of progression of the disease .
• The gardens are located above 300 meters above sea level less under attack .
• Young plants either in the nursery , budwood garden , and in the field more vulnerable .
• Plants are weak from lack of fertilizer will be more heavily affected , whereas if excess nitrogen fertilizer , plants also become more vulnerable .

Transmission or spread of this disease mainly through spores ( conidia ) that is blown by the wind , workers / employees gardens or other materials .

For the control of this disease carried by some appropriate ways , among others :
- Technical culture

1. To prevent this disease by planting suggestions 4:4 resistant clones in 1 planting area .
2. Additional fertilizer nutrient content impartial .
3. In certain cases , grafting canopy can be done to reduce the risk losses due to this disease .

- Chemical
To protect plants from Corynespora done by spraying fungicides are recommended .