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Information for Black Sigatoka Spray Evaluation


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Accumulation of rain for residue evaluation on Field.Climate:
If rain is >= 3mm it is counted and accumulated for:
- 3 days
- 5 days
- 7 days

91d373e9bb3b72bc7281a5a99c3d4dea 2 The accumulated rainsum results in a Graph in reference to a threshold of 10, 20 and 30 mm.

Leaf formation for residue evaluation on Field.Climate: If day and night air temperature are: 

12-14°C and 12-13°C it takes 23, 16, or 21 days 15-17°C and 14-15°C it takes 20, 14, or 10 days 18-20°C and 16-22°C it takes <15, <12, or <8 days 21-27°C and 16-22°C it takes <13, <11, or <6 days 28-30°C and 23-24°C it takes <14, <12, or <8 days 31-40°C and 25-40°C it takes 20, 14, or 10 days to form all leaves on varieties with average, fast and very fast leaf formation. The days needed for leaf formation are displayed as lines in a graph.

These  information should help to evalutate unprotected tissue. Reasons therefore could be a high amount of rain since the last application of plant protection measurements (residue are already washed off or new leaves are formed.

For more Information about the Sigatoka Infection model click here. For more Information about the Sigatoka Risk model click here. For more Information about the Black Sigatoka Biology click here.