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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Groundnut rosette disease

Groundnut Rosette Virus (GRV)
Ghana
  • Plant rosette resistant or tolerant varieties such as 'Adepa' or 'Konkoma' released by CSRI (Crops Research Institute). Contact CSRI to see if they are available
  • In the absence of resistant varieties the following can be practiced:
    • Remove volunteer groundnut or leftover plants immediately after harvest and destroy in the field by burning or burying
    • Intercrop groundnuts with cereals such as sorghum, millet or maize
    • Practice crop rotation ever 1-2 years with such as sorghum, millet or maize
    • Practice early planting and avoid wide spacing. Plants should form uniformly dense stands as aphids often land preferentially on widely spaced plants
  • Monitor young plants weekly for aphids vectors. Examine leaf surfaces after germination particulary growing tips - aphids prefer feeding on young and soft tissue
  • Look for glossy black or dark brown bodied aphids measuring about 2 mm in length on the plants
  • Monitor young plants from 30-45 days after sowing for symptoms of rosette - stunted growth, chlorosis and reduced leaf sizes and leaf distortion
  • Start control as soon as symptoms of the virus are observed or the presence aphids are detected
  • Yellow direct control should not be delayed if susceptible cultivars or varieties are planted
  • Rogue infected plants when observed to reduce source of infection and destroy by burning in the field
  • Control aphids by spraying soap solution (1 tea spoonful of dishwashing soap in 4L of water) 2-3 times at 3-4 day intervals early or late in the day
  • Spray neem seed water extract (5% concentration, w/v) to control aphids just after their appearance (second and third sprays must be applied at 14 days intervals). PHI: 24 hrs
  • Position a number of sticky yellow traps or yellow sheets (A4 size) at different locations in the field to trap winged aphids
  • When using a pesticide or botanical, always wear protective clothing and follow the instructions on the product label
  • Do not use chemicals with the same mode of action year after year as this can lead to resistance
  • Always consult the most recent list of registered pesticides of MOFA, Ghana
  • Application of chemical control may not be practiced by small scale farmers for economic reasons
  • Spray imidacloprid (Confidor 200SL, Confidor 200 OD, Bastion Extra 3G, Akape 20 SC) at 5-8ml/15L of water to control aphids and other insect vectors. Systemic neonicotinoid, IRAC group:4A
  • WHO class II (Moderately hazardous). Apply 30 days after sowing and repeat 15 days after first application to contol population of aphids. PHI: 24 hrs & REI 24 hrs
  • Spray lambda-cyhalothrin (Clear 2.5 EC, Conquer Super 2.5 EC, Ekuapa 2.5 EC) at 50ml/15L of water to control aphids. A quick-acting contact and stomach action pyrethroid, IRAC group: 3A
  • WHO class II (moderately hazardous). Apply 30 days after sowing and repeat 15 days after first application. PHI: 24 hrs & REI 24 hrs
AUTHOR(S): E. Moses (Scientific and Agricultural Consultants, Impact Plus Co. Ltd.), F. C. Brentu (University of Ghana), F.A. Nyarko (The Council for Scientific and Industrial Research)

CREATED/UPDATED: May 2016
PRODUCED BY: Plantwise

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