Group Title: ARC-A research report - Agricultural Research and Education Center - RH-1982-20
Title: Why does accurate disease diagnosis take so long
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00066471/00001
 Material Information
Title: Why does accurate disease diagnosis take so long
Series Title: ARC-A research report
Physical Description: 2 p. : ; 28 cm.
Language: English
Creator: Chase, A. R ( Ann Renee )
Agricultural Research Center (Apopka, Fla.)
Publisher: University of Florida, IFAS, Agricultural Research Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1982
Subject: Plant diseases -- Diagnosis -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
Statement of Responsibility: A.R. Chase.
General Note: Caption title.
Funding: Florida Historical Agriculture and Rural Life
 Record Information
Bibliographic ID: UF00066471
Volume ID: VID00001
Source Institution: Marston Science Library, George A. Smathers Libraries, University of Florida
Holding Location: Florida Agricultural Experiment Station, Florida Cooperative Extension Service, Florida Department of Agriculture and Consumer Services, and the Engineering and Industrial Experiment Station; Institute for Food and Agricultural Services (IFAS), University of Florida
Rights Management: All rights reserved, Board of Trustees of the University of Florida
Resource Identifier: oclc - 70710006

Table of Contents
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Full Text


The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source

site maintained by the Florida
Cooperative Extension Service.

Copyright 2005, Board of Trustees, University
of Florida

o H-.

A. R. Chase
IFAS, University of Florida
Agricultural Research Center-Apopka
ARC-A Research Report, RH-1982-20

A rapid answer to a problem situation in the nursery is very important

but often not possible to obtain if a disease is suspected. Why does

accurate disease diagnosis take so long? This question has been asked

by many growers.

The methods employed by plant pathologists in disease diagnosis

are time-consuming and cannot be altered in most cases. Diseases caused

by bacteria may require from 12-24 days before an accurate diagnosis is

made, while fungal diseases generally require 5-14 days. The reason such

lengthy amounts of time are required relates to the fact that identifi-

cation of fungi is made through examination of certain reproductive

structures. Sometimes these structures form on the plant tissue itself

but more commonly culturing in the laboratory is required. Certain fungal

pathogens require special light, temperature and culture medium to

stimulate formation of these structures, thus increasing the time which

elapses between submission of the sample and diagnosis. Bacteria present

a more difficult problem in diagnosis since they cannot be identified

on the basis of appearance and must be tested extensively once isolated

from the plant tissue. Isolation of bacteria in a pure form takes from

7-10 days. Subsequent testing on special media under various conditions

requires an additional 5-14 days. Thus, the overall time required may

be from 12-24 days before an accurate diagnosis of bacterial disease is

given. This is not a convenient amount of time for growers to wait for

a diagnosis and recommendation but in the vast majority of cases this

amount of time cannot be avoided.

In some cases, an experienced plant pathologist can make a diagnosis

based upon recognition of symptoms. The following suggestions will allow

rapid diagnosis in such cases. Growers should maintain a close watch on

their crops and seek help at the first sign of a problem, thus curtail-

ing development of emergency situations. The quality of samples and

information on culture of the crop also greatly influence the speed of

response. Poor sample quality due to inadequate size or deterioration

can eliminate the chance of diagnosis without culturing. Information

such as fertilization, pesticide and watering schedules are all important

facts used in accurate diagnosis of plant problems.

Don't despair that you will never receive a diagnosis and recommen-

dation before the crop is lost. Watch your crops carefully, select the

best sample of the problem available, include cultural information and

be patient. Plant pathologists will provide the necessary information

as soon as circumstances allow.

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