GrowHow

How to manage disease

Onion

  • Use resistant varieties, if available
  • Practice good soil preparation and monitor soil pH
  • Maintain good soil moisture and avoid waterlogging
  • Use pathogen-free (certified) seeds and seedlings
  • Practice proper spacing for good ventilation and sun exposure
  • Use fertilizers and pesticides properly
  • Clean tools with bleach solution
  • Control weeds as alternate hosts of insects
  • Flooding soil to destroy pupa and larva
  • Observe 1-2 months fallow period to break insect lifecycle
  • Use of natural enemies such as earwigs and trichogramma against Spodoptera
  • To prevent infection from spreading, sick plants, old crops and weeds must be removed and destroyed
  • Crop rotation prevents build up of insect pests and diseases and restores soil fertility

 

Control insect vectors using insect traps, reflective mulches or insecticides spray
ACTIVE INGREDIENT MoA* Aphids Thrips
Lambda-cyhalothrin 3A
Cypermethrin 3A
Thiamethoxam 4A
Imidacloprid 4A
Dinotefuran 4A
Azadirachtin unknown
Thioxyclam hydrochloride 14
  • *Alternate mode of action groups to prevent build up of resistance