Special Weeds in Cropped Areas – Chandwel (Convolvulus arvensis)
Chandwel of Filed Bind Weeds (Convolvulus arvensis):
Deep, rooted petennial weed, country wide trailing herb, reproduced by shallow creeping roots 6-9 cm deep. It does under dormancy in extreme draught having long seed dormancy. Prominent in semi arid region, gardens, cultivable land. Crops like wheat, barley oat, potato, sugarcane. It binds the crops.
Repeated deep ploughing in summer to expose the roots and rhizomes to Sun. Growing of competitive crops like fodder.
Phenoxy herbicides are used in winter. 2.4-D three times used at
i) Full tillering
ii) Stiff dough and
iii) After crop harvest when new bind weed plants are 10-5 cm high. After harves, treatment is 0.2 – 0.3% 2.4-D, 2.4,5 – T or Silvex (2:1) are superior. Ester forms of Phenoxy are more effective than salts. Repeated application of 2.4-D and Dicamba (0.5 kg/ha) or pichloram (0.25/kg/ha) at bud stage are effective to eradicate bind weed also trifularalin, Nitralin, Prometryne and 2.4-D, Dicamba.