Problems of grassland weeds and their control in India.
Weeds compete with grasses in protected and overgrazed grasslands in India. Brush species such as Carissa spinarum, Ziziphus nummularia and Acacia catechu and herbaceous weeds such as Barreria stricta, Indigofera hirsuta, Celosia argentea, Eremopogon foveolatus, Desmostachya bipinnata and Trichodesma indicum occur in dry habitats whereas Lantana camara, Mimosa rubicaulis, Cyperaceae and Saccharum spontaneum become established in wet habitats. Aristida spp. and Cassia tora replace superior grasses when overgrazing takes place. Stump treatment with 2, 4, 5-T controlled the brush and 2, 4-D killed the broad-leaved weeds. Dalapon at 20 kg a.e./ha, applied to freshly-cut tussocks of D. bipinnata controlled regrowth from 30% of tussocks. Ploughing in hot weather in May followed by application of TCA-sodium at 30 kg a.e./ha in June reduced populations of S. spontaneum and regenerated plants were controlled by dalapon 4-aminotriazole at [a total of] 10 kg/ha. The scope for weed control in grasslands is discussed.-P.K.