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2020-05-19T20:55:00.0000000Z
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ANTHRACNOSE TWISTER COMPLEX, ONION - INDIA: (KARNATAKA)

ProMED
<http://www.promedmail.org>

Source: Times of India [edited]
<https://timesofindia.indiatimes.com/city/mysuru/after-lockdown-woes-onion-farmers-hit-by-twister-blight/articleshow/75663463.cms>

Onions on hundreds of acres in Chamarajanagara district have been
infected by the twister blight [which] twists the leaves of the crops,
causing the onions to decay rapidly.

"This is the 1st time that the disease has damaged crops in such a
large scale. It has affected the entire district [where] onions are
one of the major commercial crops. [The] horticulture department claim
that moisture in the soil is causing the damage, but we have had good
yield for years despite heavy rainfall," said [a local official].

[A] farmer leader said, "Farmers, without assistance, cannot identify
the pesticides to be sprayed for different diseases. To grow good
crops, there should [be] agri-clinics with technical assistants, who
can guide farmers. The current scenario calls for a survey of the
onion crop loss."

[Byline: Lakshmikantha BK]

--
Communicated by:
ProMED-mail
<promed@promedmail.org>

[A number of fungi have been found to be associated with the
anthracnose-twister disease complex (ATDC) of onion and other allium
crops. Pathogens generally include _Glomerella_, _Colletotrichum_ and
_Gibberella_ species. The latter are thought to be primarily
responsible for distortion and twisting of leaves. Symptoms may also
include water-soaked, pale yellow spots on leaves, which expand
lengthwise until covering the entire leaf blade, followed by
shrivelling and drooping of affected leaves. Severe crop losses of up
to 100 percent have been reported due to ATDC.

The fungi survive on crop debris. Spread occurs mainly with infected
plant material and by mechanical means. Disease management may include
removal of infected crop debris to reduce inoculum, crop rotation,
fungicides (although effectiveness may be limited), biocontrol
organisms (for example _Trichoderma_) and cultural measures (reduction
of moisture in the crop). Some resistant or tolerant onion cultivars
are being developed.

Maps
India (with states):
<http://www.mapsofindia.com/maps/india/india-political-map.htm>
Karnataka districts:
<https://www.mapsofindia.com/maps/karnataka/karnataka.htm>

Pictures
ATDC symptoms on onion:
<https://seminisus.s3.amazonaws.com/app/uploads/2014/11/Screen-Shot-2020-02-13-at-2.35.24-PM.png>
<https://static.vikaspedia.in/media/images_en/agriculture/crop-production/integrated-pest-managment/ipm-for-vegetables/ipm-strategies-for-onion/twisterdiseaseimg.jpg>,
<https://tuyisengemoses.files.wordpress.com/2017/05/img_20170505_102611.jpg>,
<https://plantdoctor.eastwestseed.com/sites/default/files/styles/diagnosis/public/pic%20027.jpg>
and
<https://plantdoctor.eastwestseed.com/sites/default/files/styles/diagnosis/public/EW_%20014.jpg>

Links
Information on onion ATDC:
<https://plantdoctor.eastwestseed.com/diagnostic-key/anthracnose-twister>
(with pictures),
<https://vikaspedia.in/agriculture/crop-production/integrated-pest-managment/ipm-for-vegetables/ipm-strategies-for-onion/diseases-and-symptoms>,
<https://www.seminis.com.au/resources/disease-guides/onions/twister/>,
<https://pnwhandbooks.org/plantdisease/host-disease/onion-allium-cepa-twister>
and via
<https://tuyisengemoses.wordpress.com/2017/05/25/oniononiononiononion-disease/>
ATDC aetiology and risk assessment
<https://doi.org/10.20546/ijcmas.2018.712.413>,
<https://eagronfiles.wordpress.com/2009/05/28/scientists-identify-two-anthracnose-pathogens-attacking-onions/>,
<https://link.springer.com/article/10.1007/s41324-018-0229-4> and
<https://www.bar.gov.ph/index.php/news-and-events/925-2009-06-pathogens>
Fungal taxonomy and synonyms via:
<http://www.indexfungorum.org/Names/Names.asp>
 - Mod.DHA]

[See Also:
2016
----
Anthracnose & purple blotch, onion - Philippines: (IN)
http://promedmail.org/post/20160729.4378522
2011
----
Purple blotch & anthracnose, onion - India: (MH)
http://promedmail.org/post/20110103.0024
2010
----
Purple blotch & anthracnose, onion - India: (MH)
http://promedmail.org/post/20110103.0024
2009
----
Fungal blight, onion - India: (MH)
http://promedmail.org/post/20090103.0024
and additional items on anthracnose diseases in the archives]
.................................................sb/dha/msp/jh

------------------------------

Message: 2
Date: Tue, 19 May 2020 02:07:20 +0000
From: promed-plant@promedmail.org
Subject: PRO/PL> Undiagnosed disease, rice - India: (TR)
To: promed-post@promedmail.orgpromed-plant-post@promedmail.org
Message-ID:
        <010001722aaf7169-5d642112-8ba0-4b5d-8551-b2a74d989ebb-000000@email.amazonses.com>

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UNDIAGNOSED DISEASE, RICE - INDIA: (TRIPURA)
********************************************
A ProMED-mail post
<http://www.promedmail.org>
ProMED-mail is a program of the
International Society for Infectious Diseases
<http://www.isid.org>

Date: Tue 12 May 2020
Source: The Sentinel [edited]
<https://www.sentinelassam.com/tripura-news/tripura-mysterious-disease-of-plants-reportedly-destroys-crops-in-tripura-minister-pays-visit-471877>


In some areas of Gomati and South Tripura districts, an unknown
disease is spreading in the ripe paddy fields. Farmers lament that the
growth of the paddy plants is being affected, and in some areas, the
rice is not developing at the usual rate. Agriculture officials
collected samples [to] ascertain the nature of the disease.

Tripura Agriculture Minister Pranajit Singha Roy paid a visit to some
of the croplands, he said, "I have ordered my department to list in
which areas these cases are emerging. As per our experts, this may be
caused by faulty seeds, water scarcity, or over use of water or there
may be an attack of insects. We will find out the problem and resolve
the issue at the earliest."

--
Communicated by:
ProMED-mail
<promed@promedmail.org>

[A range of pathogens including fungi, bacteria, viruses and nematodes
have been reported to affect rice crops in the region. Retarded plant
development, the only symptom described above, may also be due to
environmental factors. Reliable diagnosis of the cause(s) and/or
pathogen(s) associated with the problems is essential before any
management strategies can be designed.

Maps
India (with states):
<http://www.mapsofindia.com/maps/india/india-political-map.htm>
Tripura districts:
<https://www.mapsofindia.com/maps/tripura/tripura-district.htm>

Pictures
Symptoms of some rice diseases via:
<http://www.ipmimages.org/browse/Areasubs.cfm?area=125&div=2>

Links
Information on some diseases of rice via:
<http://www.knowledgebank.irri.org/training/fact-sheets/pest-management/diseases>
(with pictures)
List of major diseases and pathogens of rice:
<https://www.apsnet.org/edcenter/resources/commonnames/Pages/Rice.aspx>
 - Mod.DHA]


ProMED
Onion

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