Plant Pathology: Phytoplasma and Disease Transmission
30 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

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 (D)</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 (C)</p> Signup and view all the answers

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

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

How can conidia settle on leaves cause infection?

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

How can stem infection in sugarcane occur?

<p>Via insect bores (A)</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 (B)</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 (B)</p> Signup and view all the answers

Which rust of wheat is also known as stem rust?

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

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

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

Which rust of wheat exclusively attacks the leaf lamina?

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

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

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

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

<p>Light yellow (D)</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 (B)</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 (C)</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 (D)</p> Signup and view all the answers

Where do the conidiophores of Peronospora pisi emerge from?

<p>Stomata (B)</p> Signup and view all the answers

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

<p>Abort and become undersized (C)</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 (A)</p> Signup and view all the answers

How is the primary infection of Wilt of chickpea initiated?

<p>Through chlamydospores in soil (A)</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 (A)</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 (B)</p> Signup and view all the answers

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

<p>Prochloraz + Tebuconazole (B)</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 (A)</p> Signup and view all the answers

More Like This

Use Quizgecko on...
Browser
Browser