Plant Pathology: Phytoplasma and Disease Transmission
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Questions and Answers

What is the primary mode of transmission for the phytoplasma pathogen causing the disease?

  • Through soil contact
  • Through irrigation water
  • Through aphids (correct)
  • Through infected seeds
  • What is the main effect of phytoplasma colonization on plants?

  • Improved nutrient absorption
  • Blockage of photosynthates from leaves to stalks (correct)
  • Increased growth rate
  • Enhanced photosynthesis
  • What distinguishes phytoplasma from other pathogens in terms of cell structure?

  • Presence of a rigid cell wall (correct)
  • Filamentous morphology
  • Absence of a unit membrane
  • Inability to colonize phloem cells
  • How does the disease affect the growth of sugarcane clumps?

    <p>Causes stunted growth and reduced tillering</p> Signup and view all the answers

    What method is recommended for treating healthy setts before planting to manage the disease?

    <p>Treating with hot water at 52°C for 1 hour</p> Signup and view all the answers

    Which insect is NOT mentioned as a secondary transmitter of the phytoplasma pathogen?

    <p>Aphis gossypii</p> Signup and view all the answers

    How does the fungus responsible for red rot disease survive on collateral hosts?

    <p>By spreading through rain splash and air currents</p> Signup and view all the answers

    How can conidia settle on leaves cause infection?

    <p>By germinating and invading through wounds</p> Signup and view all the answers

    What is a recommended method for preventing red rot disease in sugarcane setts before planting?

    <p>Soaking in 0.1% Carbendazim or Triademefon solution</p> Signup and view all the answers

    How can stem infection in sugarcane occur?

    <p>Via insect bores</p> Signup and view all the answers

    What is a favorable condition that can contribute to the spread of red rot disease?

    <p>Water logged conditions</p> Signup and view all the answers

    Which variety of sugarcane is recommended for its resistance to red rot disease?

    <p>CO 62198 and CO 7704</p> Signup and view all the answers

    Which rust of wheat is also known as stem rust?

    <p>Black rust</p> Signup and view all the answers

    What is the alternate host for Black rust (Stem rust) of wheat?

    <p>Berberis spp</p> Signup and view all the answers

    Which rust of wheat exclusively attacks the leaf lamina?

    <p>Orange rust (Leaf rust)</p> Signup and view all the answers

    Which rust of wheat has spherical spores with 7-10 germ pores?

    <p>Black rust (Stem rust)</p> Signup and view all the answers

    What is the appearance of teliospores in Black rust (Stem rust) of wheat?

    <p>Bicelled and dark brown with a pointed or rounded tip</p> Signup and view all the answers

    'Pustules large, elongated' is a characteristic description of which type of wheat rust pustules?

    <p>Black rust (Stem rust)</p> Signup and view all the answers

    What is the color of the conidia produced by the pathogen Peronospora pisi?

    <p>Light yellow</p> Signup and view all the answers

    Where does the downy growth of the pathogen appear in relation to the plant leaves?

    <p>Lower surface</p> Signup and view all the answers

    How do infected stems of plants typically react to the infection by Peronospora pisi?

    <p>Show reduced growth</p> Signup and view all the answers

    What is the term used to describe the finger-shaped structures sent inside host cells by the mycelium of Peronospora pisi?

    <p>Haustoria</p> Signup and view all the answers

    Where do the conidiophores of Peronospora pisi emerge from?

    <p>Stomata</p> Signup and view all the answers

    What happens to seeds lying corresponding to the symptoms on infected pods?

    <p>Abort and become undersized</p> Signup and view all the answers

    What weather conditions favor the disease cycle initiation of Wilt of chickpea?

    <p>High temperature and low humidity</p> Signup and view all the answers

    How is the primary infection of Wilt of chickpea initiated?

    <p>Through chlamydospores in soil</p> Signup and view all the answers

    What is a recommended management practice for fields with heavy incidence of Wilt of chickpea?

    <p>Avoid cultivation of chickpea in that field for 3-4 years</p> Signup and view all the answers

    Which genotypes possess resistance to Wilt of chickpea according to the text?

    <p>JG 130, JG 16, JG 14, JG 11</p> Signup and view all the answers

    Which seed treatment is effective against Root rot and Wilt diseases in chickpea?

    <p>Prochloraz + Tebuconazole</p> Signup and view all the answers

    How can the incidence of Wilt of chickpea be reduced through soil application?

    <p>Applying P.fluorescens + well decomposed FYM or sand</p> Signup and view all the answers

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