Ascochyta Black Spot of Peas
Biology:Favoured by moist conditions
Survives on crop residues.
Spread by infected seed, wind and water splash.
Life Cycle:Origin and History:
Management and Control:
Plant Peas more than 500 m from previous crops.
Plant more resistant varieties.
Rotate crops so there is at least 3 years between Pea crops.
Use seed from a crop that was not infected. Test seed for the disease.
Treat all seed with P-Pickle T, but note that this may fail if more than 12% of seeds are infected.
Apply all foliar fungicide sprays before rain.
Apply first fungicide spray 3-4 weeks after emergence.
Use higher fungicide rates if the disease is observable.
Use fine nozzles at high pressures (4 bar) delivering at least 80 L/ha spray mix.
Treat seed with 200 mL P-Pickel T per 100 kg seed.
Apply 1 kg/ha mancozeb750 3-4 weeks after planting when rain is expected.
Apply 1 kg/ha mancozeb750 3-4 weeks later when rain is expected. If disease is evident use 1 L/ha chlorothalonil720.
Monitor crop 7-10 days after each rain and if disease is detected apply 1.5 L/ha chlorothalonil720 every three weeks just before rain until pods developed.
When monitoring look for wilting of the upper foliage or small areas of dying plants then search for lesions.
Related and Similar Species:References:
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