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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Downy mildew of peas

Peronospora viciae f. sp. pisi Indwara y’imvura in Kinyarwanda
Rwanda
  • Early land preparation and soil solarization before planting.
  • Remove, burn or bury all residues (peas straw) from previous harvest (if there was disease attack last season). But do not remove debris and residues if no major pest problem is in the field, to improve soil.
  • Use seeds coated with Methalaxyl (see direct yellow).
  • Avoid too much water in the field for reducing the transmission of the disease.
  • Do weeding when weather conditions are favourable (neither hot nor humid) for not spreading the disease.
  • Rotate out of legumes with 3-6 years pea breaks. Preferably, rotate with cereals.
  • Downy mildew is a disease caused by water moulds. It is either spread in residues or from airborne spores.
  • Inspect the crop once a week in dry and twice a week in wet season.
  • Inspect 5 plants (3 leaves per each plant) at each 10 random locations in the field.
  • Look for Pale yellowish-green plants with fluffy grey spores on the underside of leaf or stem.
  • When the disease is known from last season or when found in neighbouring field consider protective fungicides.
  • When 2-5% of plants are affected, consider rapid action.
  • At 30-40% and/or when pods are affected, action is too late.
  • All diseased plants should be removed and burnt immediately after the disease is detected.
  • When using a pesticide or botanical, always wear protective clothing and follow the instructions on the product label, such as dosage, timing of application, pre-harvest interval, max number of sprays, restricted re-entry interval. Do not empty into drains and water sources.
  • Always consult recent list of registered pesticides
  • Propamocarb (Systemic)12 Foliar application, preventive (spray before symptoms); FRAC group F4.
  • WHO toxicity class II (moderately acute hazardous to humans). 3-10 applications. PHI : 7 days. REI: 12hours. Moderately harmful to water and aquatic organisms; moderately harmful to pollinators thus do not spray on flowering crop or near bee hives.
  • Metalaxyl (systemic). Seed coating; FRAC group phenylamide (PA1)
  • WHO toxicity class II (moderately acute hazardous to humans). One treatment. Seed coating can only be done by professionals; thus, farmer has to buy such treated seeds at an agri-input dealer shop. PHI and REI are not important for coatings. Harmless to water and aquatic organisms; moderately harmful to pollinators thus do not spray on flowering crop or near bee hives.
  • Cymoxanil. Foliar application, preventive (spray before symptoms)
  • WHO toxicity class II (moderately acute hazardous to humans). 3-5 applications. PHI : 3 days, REI : 12h. Moderately harmful to water organisms; moderately harmful to pollinators thus do not spray on flowering crop or near bee hives.
AUTHOR(S): Rosine MANISHIMWE (MAS-ICM student, CABI), phone no: +250788880180 email: m.rosine25@gmail.com

CREATED/UPDATED: June 2019
PRODUCED BY: Plantwise

©CAB International. Published under a CC-BY-SA 4.0 licence.