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Weed Control

Weed control can be done manually in the rows and mechanically between the rows. During harvest weed control needs to be especially well done in the rows parallel to the planting lines because the fruits are usually collected from the ground. Mechanical weeding (close to the plant less than one meter) is not recommended in order to prevent damages to the roots, which are largely concentrated within 15 to 45 cm from the stem.  Chemical weeding, using selective herbicides eliminates not only the weeds, but reduces operational costs and simplifies the work.

The best pre-emergence herbicides are "diuron" and "bromacil". Paraquat or glyphosate have been used in some plantations at 1.5 to 2.0 l/ha, and applied between the rows, leaving the dead weeds as a form of mulch covering the soil surface. While studying the selectivity of pre-emergence herbicides "diuron" (1.2, 2.4 and 4.8 kg/ha), "oxyfluorfen" (0.48, 0.96 and 1.92 kg/ha), "alachlor" (2.8, 5.6 and 11.2 kg/ha) and "atrazine" + "metolachlof (3.0, 6.0 and 12.0 kg/ha), in yellow passionfruit seedlings, observed that only "atrazine" + "metolachlor", in doses of 6.0 and 12.0 kg/ha, caused serious injury to the seedlings, while the others proved promisingly useful. Due to the fact that herbicide activity, in general, is limited to a specific plant or group of plants, it is recommended to use mixtures and planned combinations of herbicides pre-emergence and post-emergence, aiming to increase the period and active spectrum of the chemical control.


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Pineapple Research Station
Kerala Agricultural University
Ernakulam Kerala 686670