Which of the following about dispersal of bacterial diseases in crops is CORRECT?

A. Bacteria may be disseminated through movement of infected plant material

B. Some bacteria are seedborne and are disseminated via seed

C. Bacteria may be dispersed through rain splash

D. Insects can disseminate bacterial pathogens

Question

Which of the following about dispersal of bacterial diseases in crops is CORRECT?

A. Bacteria may be disseminated through movement of infected plant material

B. Some bacteria are seedborne and are disseminated via seed

C. Bacteria may be dispersed through rain splash

D. Insects can disseminate bacterial pathogens

BlackTom AI · Accepted Answer

To tackle the question, let's examine what each option asserts about dispersal routes for bacterial diseases in crops.
Option A: 'Bacteria may be disseminated through movement of infected plant material.' This is a well-recognized pathway because planting, transplanting, or trading infected parts (seedlings, cuttings, equipment, or crop residues) can introduce pathogens to new locations. The movement of contaminated material directly transfers the disease-causing agents.
Option B: 'Some bacteria are seedborne and are disseminated via seed.' Seedborne bacteria are a classic problem in agriculture; pathogens can reside on or within seeds and be carried to fields where germination and growth occur, enabling initiation of disease in new crops. This route is well established in many bacterial diseases.
Option C: 'Bacteria may be dispersed through rain splash.' Rain splash physically moves bacteria from infected tissue to nearby leaves, stems, or soil surface, facilitating local spread within a field or orchard after rainfall or irrigation. It is a common, field-level dissemination mechanism.
Option D: 'Insects can disseminate bacterial pathogens.' Insects can act as vectors, acquiring bacteria from an infected plant and transmitting them to healthy plants, or moving contaminated pollen or plant sap. This range of vector-mediated spread is widely documented for bacterial diseases in crops.
Considering each option individually, all four describe plausible and documented dispersal pathways for bacterial pathogens in crops. Therefore, every option (A, B, C and D) contributes to the overall understanding of how bacterial diseases spread in agricultural settings. All described routes can operate under different contexts, crops, and pathogens, illustrating the multifaceted nature of bacterial disease epidemiology.

AGRI20044_2025_SM1 Supplementary/Special Exam: Microbiology in Agriculture (AGRI20044_2025_SM1)- Requires Respondus LockDown Browser

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