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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Fall armyworm on maize

Spodoptera frugiperda
Ghana
  • Avoid late planting. Plant early to avoid peak immigration of adults
  • Remove and destroy all crop residues after harvest
  • Plough the soil deeply to bury the larvae and pupae in the soil
  • Regularly weed the field and surroundings
  • Ensure optimum fertilization. Recommended fertilizer rates (4 bags or 200kg of NPK 15:15:15 per ha) to increase the growth vigour
  • Remove volunteer crops and alternative hosts to reduce carryover of larvae
  • Rotate with non-host crops (e.g. Cassava, Yam)
  • Intercropping maize with cowpea, pigeon pea, cassava.
  • Start monitoring for presence of the pest or symptoms 2 weeks after emergence
  • Look for cream or grey egg masses on the stem, lower and upper parts of leaves
  • Check for light green to dark brown larvae with three thin yellowish white stripes down the back and a distinct white inverted "Y" on head
  • Check the whorl for larvae covered with a plug of yellowish brown frass
  • Look for patches of small shot holes "window pane" in the leaves emerging from the whorl
  • Monitor damage on 10 consecutive plants in 10 randomly selected sites. Take control measures if >20% of plants are infested with larvae
  • At tassel/silk stage, do not spray anymore
  • On small-scale farms, handpick and destroy the egg masses and larvae
  • Put a handful of sand (mixed with lime or ash), sawdust or soil in the whorl of the attacked plants to kill the larvae
  • 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 three successive applications as this can lead to resistance.
  • Always consult the most recent list of registered pesticides of MOFA, Ghana.
  • For recommended synthetic insecticides (Contact any District/Regional Dept. of Agric. for advice).
  • Apply Maltodextrin Eradicoat
  • WHO class U (Unlikely to present acute hazard). Apply 50ml/15lt water. REI and PHI is 0. Apply weekly based on monitoring result. Ensure good coverage of the foliage
  • Apply biopesticides: Bacillus thuringiensis products (e.g. Agoo Bypel1) and Beauveria sp
  • WHO class U (Unlikely to present acute hazard). Apply at three weeks intervals @ 50g (1 sachet)/15lt water based on monitoring result. REI is 3hrs. Ensure good coverage of the foliage
  • Apply Azadirachtin (e.g. Nemazaal)
  • WHO class U (Unlikely to present acute hazard). Apply 60-80ml per 15 litre knapsack. REI is 3 hrs. Apply weekly based on monitoring result. Spray late afternoon 4-6:00pm. Ensure good coverage of the foliage
  • Apply ethyl palmitate+ethyl oleate+elcosen (e.g Adepa)
  • WHO class U ( Unlikely to present acute hazard) Apply 100ml/15lt water at three weeks interval. REI is 24hours. Ensure good coverage of the foliage
AUTHOR(S): Patrick Beseh (PPRSD, MOFA)

CREATED/UPDATED: December 2016/March 2018
PRODUCED BY: Plantwise

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