Cyperus is so difficult to control, but you can do full tillage on your field. After that, you can aplicating systemic herbicide pre-emergence, such as diuron, bromacil.
Management of Cyperus sp requires integrated efforts in a sequential way since it’s difficult to control using chemical or mechanical option alone, as has been mentioned by Dr Ivan. Cyperus had been reported to allocate photosynthates to tuber development at 30 to 50 days after sprouting. Accordingly, spraying of herbicides (broadleaved weed killer or non-selective depending on the situation) or tillage should be done during this period. Further, the sprouting is reported to be enhanced by increase in temperature and subsequently good plant vigour. Thus, application of pre-emergence herbicide or tillage should coincide with the change in temperature. Mulching had also been reported to significantly reduce Cyperus menace. However, the choice of mulch material, for higher effectiveness, would depend on availability and feasibility under specific climate and environment.
Thanks Dr. Borah for your valuable suggestions indeed. We harvest two maize crops in a year i.e winter and spring/summer maize. We have severe problem of Cyperus during August/September planting. The soil is loamy sand with SOM of 2.5-3.3 %, average annual rainfall of 1500mm. The hottest month is July (34) and the coldest is Dec (16 degree Celsius). As per your suggestion, can we test different weed control methods like ; maize stover mulch, plastic mulch, application of pre-emergence herbicides/tank mixture of any PE herbicides?. Looking forward for your tips.
Thanks Dr Karki. An integrated approach may be developed taking into consideration all possible options like mulching, mechanical weeding and chemical spray. The herbicides may be rotated in a sequence like non-selective followed by pre-emergence followed by BLW killer. Regarding mulch materials, literature may kindly be reviewed as bio-mulch had been reported in many cases better over plastic mulch. Maize stover would be a good option, and may be evaluated.
Many many thanks Dr. Borah, an IWM trial on maize will be initiated asap considering your suggestions.
Cyperus management requires integrated efforts in a cropping system mode , since, it’s bit difficult to control using herbicides or mechanical option alone, . It has tendency to had trans-locate its photosynthates to tuber development. Pre-plant application (10-15 days prior to seeding) of non-selective herbicides viz., Glyphosate @ 1.0 kg a.i. ha-1 in 400-600 litre water or Paraquat @ 0.5 kg a.i. ha-1 in 600 litre water is sufficient, coupled with One to two hoeing are recommended for aeration and uprooting of the remaining weeds, if any.
Recently new herbicides has been recommended in India for effective control of Cyperus species in maize and sugarcane. Halosulfron methyl 75 %WG @67.5 ga.i./ha ( 90 g product /ha Trade name Sempra) marketed by Dhanuka Agritech Ltd applied at 20-25 Days after sowing or at 3-5 leaf stage of Cyperus (before flowering in cyperus) in proper moisture with flat fan nozzle have been found to give 90-9 % control of Cyperus species, The beauty of this herbicide is that it kills the nuts also. This herbicide is recommended in sole maize only. It cost aroound Rs. 2000/acre( 36 gm packing /acre product)
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