Wheat Insect Pests

Dec 22, 2022
Plant Protection - Insect Pests
Wheat Insect Pests
1. Termites

Symptoms/Damage:

  • Termites attack the crop at various growth stages, from seedlings to maturity.
  • They feed on roots, stem of growing plants, even dead tissues of plant feeding on cellulose.
  • The damaged plants dry up completely and are easily pulled out.
  • The plants damaged at later stages give rise to white ears.
  • Infestation is heavy under unirrigated conditions and in the fields where undecomposed farm yard manure is applied before sowing.

Control:

  • Treat the seed by diluting 40 g Thiamethoxam or 160 ml Chlorpyriphos 20 EC or 80 ml Imidacloprid + Hexaconazole in one litre of water and spray the same on 40 kg seed, spread as a thin layer on the pucca ground or tarpaulin or polythene. Seed treated with Imidacloprid + Hexaconazole also control smuts of wheat.
  • In case of severe infestation, broadcast 7 kg Fipronil or 1.2 litre Chlorpyriphos 20 EC per acre mixed with 20 kg of moist sand before first irrigation. 
  • Generally, termites cause more damage in sandy soil and irrigating the affected fields result in some control of termite damage. 
2. Aphids

Symptoms/Damage:

  • Aphid damage the crop resulting in discoloration of leaves.
  • Early yellowing of upper leaves and ears could be observed after a heavy infestation.  
  • Like other aphids, the nymphs and adults suck the sap from plants, particularly from their ears. They appear on young leaves or ears in large numbers during the cold and cloudy weather.
  • The damage is particularly severe in years of cloudy weather. A heavily manured, well-irrigated and succulent crop will harbour the pest for a longer period and suffer greater damage.

Control:

  • In case aphid infestation exceeds economic threshold level of 5 aphids per earheads (recorded from 10 randomly selected ear heads in each of the 4 quarters of one acre field), give single spray of 20 g Thiamethoxam 25 WG in 80- 100 lit. of water per acre using knap sack sprayer.
  • Insecticides should be applied only if the aphid attack appears on earhead stage. 
  • Since the aphids appear first on borders of the crop, spray only the infested strip to check their further spread.

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