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Basal rot on onion in Telangana, India


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: Thu 18 Nov 2021
Source: The New Indian Express [summ. Mod.DHA, edited]
https://www.newindianexpress.com/states/tamil-nadu/2021/nov/18/shallots-likely-to-be-dearer-as-basal-rot-ruins-crop-2384964.html


Incessant rainfall has led to spread of basal rot disease in over 50% of shallot crops in Tiruchy and Perambalur districts. According to the respective Horticulture Departments of the 2 districts, in Tiruchy over 1000 hectares out of a total of 2000 hectares and in Perambalur over 40% out of a total 4400 hectares of the crops are, or are likely to be, affected by the disease.

A major part of the current harvest has been destroyed, and old stocks are depleting fast. This has driven up prices in local markets. The next crop is likely to be harvested in January 2022.

[byline: M S Thanaraj]

--
communicated by:
ProMED
<promed@promedmail.org>

[A number of fungi can affect onion (_Allium cepa_; some varieties known as shallots) and related crops such as garlic (_A. sativum_) to cause root and basal rots. The term 'basal rot' is mostly used for species of _Fusarium_, but it is not clear whether an identification has been obtained since an outbreak of an unspecified root rot was reported in the area earlier (ProMED post 20210202.8156911). Species of _Phoma_, _Pythium_, _Rhizoctonia_, as well as some nematodes have also been reported to be associated with root rot symptoms.

Root rot diseases are usually soilborne and also spread with infected plant and other materials, including agricultural implements. They are generally favoured by wet conditions and are difficult to control. Disease management may include deep plowing, phytosanitation, and crop rotations of several years. For fungal rots, appropriate fungicide regimes may be helpful, but agrochemicals are often of limited use for soil-borne pathogens.

Maps
India (with states):
https://www.worldometers.info/img/maps/india_physical_map.gif
Tamil Nadu districts:
https://i.pinimg.com/736x/26/75/6d/26756d256f9b2e294baa3fc6fa09bb1e.jpg

Pictures
Root & basal rots of onion:
https://www.mtvernon.wsu.edu/path_team/DiseaseGallery/onion-fusarium-basal-rot-5L.jpg,
https://res.cloudinary.com/growinginteractive/image/upload/q_80/v1512747965/Diseases/onion-fusarium-basal-rot-2.jpg,
https://res.cloudinary.com/growinginteractive/image/upload/q_80/v1512747970/Diseases/onion-fusarium-basal-rot.jpg and
https://www.mtvernon.wsu.edu/path_team/DiseaseGallery/dg91L.jpg (affected field)
Basal rot of garlic:
https://pnwhandbooks.org/sites/pnwhandbooks/files/plant/images/garlic-allium-sativum-basal-rot/acfuaa005659.jpg

Links
Information on onion basal rot
https://www.cabi.org/isc/datasheet/24624,
https://www.growveg.co.uk/plant-diseases/uk-and-europe/onion-fusarium-basal-rot/,
https://pnwhandbooks.org/plantdisease/host-disease/onion-allium-cepa-fusarium-basal-rot,
https://doi.org/10.1080/03235408.2019.1672913 and
https://wegrowfortheworld.com/2016/09/fusarium-basal-plate-rot-of-onion-in-2016/
Other major root rot pathogens of onion (and garlic) via:
https://www.apsnet.org/edcenter/resources/commonnames/Pages/OnionandGarlic.aspx
Fungal taxonomy via:
http://www.indexfungorum.org/Names/Names.asp
- Mod.DHA]

See Also

Undiagnosed root rot, onion - India: (TN) 20210202.8156911
2020
---
Purple blotch & undiagnosed bulb rot, onion - India: (KA) 20200903.7741820
2019
---
Purple blotch, shallot - India: (TN) 20191208.6829852
2016
---
Root rot, garlic - Bangladesh: (BA) 20160325.4117622
2015
---
Undiagnosed fungus, garlic - India: (KL) 20150904.3623031
2011
---
Stem & bulb nematode, garlic - USA: (NY) 20111117.3388
Potato rot nematode, garlic - Canada: (ON) 20110825.2589
and additional items on root diseases of _Allium_ crops in the archives



More news from: ISID (International Society for Infectious Diseases)


Website: http://www.isid.org

Published: November 25, 2021

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