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Scientific name: Leptocorisa acuta, Alydidae, Hemiptera.
Symptom of attack: Leaves turn yellow and later rusted from tip downwards.
Appearance of numerous brownish spots at the feeding sites / shrivelling of grains.
In the case of heavy infestation, the whole earhead may become devoid of mature grains. Its presence in the field is made out by its strong smell.
Nature of damage: Both adults and nymphs do the damage. The nymphs start feeding 3 to 4 hours after hatching. They feed on the leaf sap near the tip/ on milky sap in developing spikelets at milky stage.
Sucking of the milky sap causes ill-filled/ partial filled and chaffy grains. Serious infestation can reduce the yield by 50%.
The straw gives off-flavour that is unattractive to cattle.
Management: Chemical control: Spraying of Endosulphon 35 EC or Quinolphos 1.5% Dust @ 25 kg/ha, or Quinolphos 25 EC @ 1.5 liter in 500 liter water / ha is found to be highly effective in controlling the insect populations.
C S Azad University of Agriculture and Technology, Kanpur