Related Experiment Video
Updated: Jan 28, 2026
07:36
Visualizing Early Infection Sites of Rice Blast Disease Magnaporthe oryzae on Barley Hordeum vulgare Using a Basic Microscope and a Smartphone
Published on: March 17, 2023
2.2K
First Report of Rhizoctonia oryzae on Pea
1USDA-ARS, Root Disease and Biological Control Laboratory, Washington State University, Pullman 99164-6430.
Plant Disease
|March 2, 2019
Summary
Rhizoctonia oryzae, a fungus, was identified as the cause of stunting and root rot in pea crops in Idaho. This marks the first documented instance of this pathogen affecting a dicotyledonous plant in North America.
Area of Science:
- Plant Pathology
- Mycology
- Agricultural Science
Background:
- Severe stunting, lateral root rot, and brown taproot discoloration were observed in direct-seed pea cv. Columbia in Idaho in May 2001.
- The affected field had a prior cropping history of direct-seeded spring barley.
- Initial observations suggested a potential soilborne pathogen impacting pea cultivation.
Purpose of the Study:
- To identify the causal agent responsible for the observed disease symptoms in pea plants.
- To confirm the pathogenicity of the isolated fungus on pea cultivars.
- To assess the implications of this pathogen on crop rotation systems in the Pacific Northwest.
Main Methods:
- Fungal isolation from infected pea roots using water agar with antibiotics.
- Identification of fungal isolates as Rhizoctonia oryzae (teleomorph Waitea circinata) based on morphology and anastomosis.
- Pathogenicity testing using colonized oat seeds as inoculum in both pasteurized and non-pasteurized soil, with and without metalaxyl treatment.
Main Results:
- Rhizoctonia oryzae was successfully isolated and identified from diseased pea roots.
- Pathogenicity tests confirmed that R. oryzae caused damping-off, stunting, root tip necrosis, and reduced lateral root formation in pea plants.
- R. oryzae was reisolated from infected roots, confirming its role in the disease.
Conclusions:
- This study provides the first report of Rhizoctonia oryzae causing disease on a dicotyledonous plant in North America.
- The pathogen's ability to affect peas, which are often rotated with cereals like barley and wheat, has significant implications for disease management.
- Understanding R. oryzae's virulence on both legumes and cereals is crucial for sustainable crop rotation strategies in the Pacific Northwest.
More Related Videos
Related Concept Videos
01:24Data Reporting and Recording
5.4K
Reporting and recording are crucial in data documentation. The timely, thorough, and accurate documentation of facts is essential when recording patient data. Failure to record findings during an assessment or interpretation of a problem will result in loss of information and make the patient document unreliable. The reader is left with general impressions if the information is not specific. A recording is documenting data of the individual's health information in a traceable, secure, and...
5.4K
01:25Types of Reports I: Hands-off Report
1.5K
A hand-off report, also known as a change-of-shift report, is a crucial nursing process that ensures the smooth transition of patient care responsibilities between nursing staff.
Following are the key components and categories of hand-off reports:
Purpose and Process:
Following are the key components and categories of hand-off reports:
Purpose and Process:
1.5K
01:21Types of Reports II: Incident or Occurrence Report
1.2K
An Incident or Occurrence Report in a healthcare setting is a crucial document used to record any unexpected occurrence that may or may not have affected a patient, employee, or visitor. Such reports are critical to improving patient safety and include all details leading up to and including the event.
Purposes:
In the healthcare industry, reports play a crucial role in documenting incidents within an agency. The primary objective of these reports is to ensure patient safety, uphold the...
Purposes:
In the healthcare industry, reports play a crucial role in documenting incidents within an agency. The primary objective of these reports is to ensure patient safety, uphold the...
1.2K
01:26Types of Reports III: Telephone and Verbal Reports
1.0K
Telephone and Verbal Reports in healthcare settings are two communication methods for conveying therapeutic instructions from healthcare providers to nurses or other healthcare staff.
Here's an overview of each type:
Telephone Orders
Here's an overview of each type:
Telephone Orders
1.0K
02:11Reporter Genes
13.2K
Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
13.2K
01:22Self-Report Tests of Personality
801
Self-report inventories are objective personality assessments that use multiple-choice items or numbered scales, typically ranging from 1 (strongly disagree) to 5 (strongly agree). They are often called Likert scales after Rensis Likert. These inventories are widely used due to their ease of administration and cost-effectiveness. One of the most prominent examples is the Minnesota Multiphasic Personality Inventory (MMPI), initially developed in the 1940s to assess abnormal personality traits.
801