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1. The larvae of these insects bore into the stem and cause damage from July to October.
2. The affected young plants show dead-hearts (yellowing and drying of central shoot) whereas the old ones produce empty earheads which turn white and stand erect.
3. The fields showing more than 5% dead hearts (economic threshold level) should be sprayed with 350 ml of Hostathion 40 EC (triazophos) or 560 ml of Monocil 36 SL (monocrotophos) or 1 litre of coroban / Dursban/ Lethal/ Chlorguard /Durmet / Classic/ Force 20 EC (chlorpyriphos) in 100 litres of water per acre.
4. Further application of any of these insecticides may be repeated as and when damage reaches economic threshold level.
Punjab Agricultural University, Ludhiana