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  • ICAR and TNAU E-Course Summarized

    Summarized Notes
  • Which is the total stem parasitic weed?

    Question: Which is the total stem parasitic weed?

    Options:

    2
    Loranthus
    Cuscuta
    Striga

    Key Points
    The parasite weeds are either total or partial.
    The weeds that depend completely on the host plant are termed as total parasites while the weeds that partially depend on the host plant for minerals and are capable of preparing their food from the green leaves are called partial parasites.
    Those parasites that attack roots are termed root parasites and those that attack shoots of other plants are called stem parasites.
    Additional Information
    Types of parasitic weeds:
    Total root parasite: Orabanche cernua on Tobacco
    Partial root parasite: Striga lutea on sugarcane and sorghum
    Total stem parasite: Cuscuta chinensis on lucerne and onion
    Partial stem parasite: Cassytha filiformis on orange trees and Loranthus longiflorus on mango and other trees.
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