Common Weeds in Rice Crop Common weeds in rice fields grouped into three categories  Grasses, Sedges, and Broad leaved weeds Grasses Grasses are the monocots with two ranked leaves, that are usually long, narrow and upright with parallel venation's. Resemble rice crop the stems are more or less round in shape, possess nodes, internodes are generally hollow with scattered vascular bundles. Leaves have ligule and auricle at the junction of lamina and leaf sheath. Some of the grassy weeds are as follows, Echinochloa colonum Echinochloa crussgalli Setaria glauca Dactyloctenium aegyptiacum Digitaria longifolia Cynodon dactylon Saccharum munja Eleusine indica Eragrostis interupta Paspalum scrobiculatum Leersia hexandra Eragrostis aspera

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Sedges Sedges are very similar to grasses but have three ranked leaves. The stems are usually triangular and they won't possess nodes and internodes. Several species have modified rhizomes which are used for food storage and propagation. Some of the sedges are given below, Cyperus rotundus Cyperus iria Cyperus difformis Fimbristylis milliaceae Scirpus erectus Cyperus haspan

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Broad Leaved Weeds Broad leaved weeds are usually dicots with tap root system. The stem has branches and leaves with a net venation. Some of the broad leaved weeds are, Eclipta alba Monochoria vaginalis Sphenoclea zeylanica Marsilea quadrifolia Commelina benghalensis Aegetarum conyzoides Ludwigia parviflora     Eichornia crassipes Salvinia molesta Alternanthera sessilis Ammanea baccifera Details of Weeds in Rice Common name Botanical Name Family Plant Descr iption Habitat Method of prop agation Suit able herb icides No of seeds Goat weed Ageratum conyzoides Comp ositae An erect branched annual Garden lands and wet lands By seeds like achenes 2,4-D - - Asteracanta Longifolia Acant haceae A tall herb with dense clusters of narrow leaves and long woody spines Rice field& Margins of tanks By seeds 2,4-D &2,4,5-T - - Centella asiatica Umbellli feraceae A prostrate herb Rice fields along bunds of irrigation channels By bits of fruits 2,4-D - Caravelle seed Cleome gynandra Cappar idaceae Annual Rice fallows & cultivated lands seeds 2,4-D 8000 Tropical spider wort Commelina beng halensis Comma linaceae A Fleshy branched perennial herb Cultivated fields & waste lands seeds 2,4-D - Field bind weed Conv olvulus arvensis Convolv ulaceae An obnoxious weed with a deep root system Cultivated fields & waste places By seeds& Under ground stems - 200 to 400 more - Crot alaria quinq uefolia Legumi naceae An errect annual herb Rice fields in coastal areas By seeds - 2500 - Cyanotis axillaris Comme linaceae A succulent annual herb In rice fields and moist situations By seeds and bits of stem 2,4-D - Bermuda grass or Dub grass Cynodon dactylon Gramin aeceae A perenneal hardy and much branched herb Cultivated fields ,waste lands By grain s & under ground stems Dalapon TCA, Amitrol - Bulb grass Cyperus bulbosus Cyper aceae An errect herb growing in small clumps Cultivated and waste places By bulbs & Nuts Chlor opicrin, Methyl bromide - - Cyperus difformis Cype raceae An errect, tuffed, glabrous annual Rice fields By seeds - - - Cyperus iria Cype raceae An erect glabrous annual Rice fields, Marshy places and in ponds & ditches during monsoon By seeds - - Nut grass Cyperus rotundus Cyper aceae An erect, glabrous perennial herb Cultivated lands & waste fields By seed like Nuts and under ground stems Chlor opicrin, methyl bromide 3000 / aerial shoot

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