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  • ICAR and TNAU E-Course Summarized

    Summarized Notes
  • Example of partial root parasitic weed is: (RJ AO 2014)

    Question: Example of partial root parasitic weed is: (RJ AO 2014)

    Options:

    Loranthus
    Orobanche
    Cuscuta
    Striga

    ✅Explanation: Striga (commonly known as witchweed) is a parasitic weed that attaches to the roots of host plants, drawing nutrients and water from them. It’s a significant problem in cereal crops, particularly in Africa. While it’s a root parasite, it also has a degree of photosynthesis, making it a partial parasite.

    📌Other Options Explanations:
    -A. Loranthus: This is a mistletoe, a stem parasite that grows on the branches of trees.
    -B. Orobanche: (Broomrape) is a holoparasite, meaning it completely depends on the host plant for nutrition. It lacks chlorophyll.
    -C. Cuscuta: (Dodder) is also a holoparasite, lacking chlorophyll and entirely relying on the host plant.

    🔑Key point: and 🔴Additional information:: Regarding Parasitic Weeds:

    ✏️Striga spp. (Witch weed):
    -Type: Semi-root parasite
    -Host plants: Pearl millet, Sorghum, Maize, Sugarcane, Sunflower

    • 🔴Additional information:: on Other Parasitic Weeds:

    ✏️Loranthus spp. / Dendrophthoe falcata:
    -Type: Semi-stem parasite
    -Host plants: Plantation crops, especially Mango

    ✏️Orobanche spp. (Broomrape):
    -Type: Total root parasite
    -Host plants: Mustard and solanaceous crops like Tomato, Potato, Chilli

    ✏️Cuscuta spp. (Dodder):
    -Type: Total stem parasite
    -Host plants: Lucerne

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