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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue May 2022, 43 (3)                                     Back


nstantaneous and historical temperature effects on a-pinene

Detection, characterization and management of

brinjal little leaf disease in Assam

 

D.S. Dutta1*, M.K. Kalita2 and P.D. Nath1

1Department of Plant Pathology, Assam Agricultural University, Jorhat-785 013, India

2Department of Plant Pathology, Biswanath College of Agriculture, Assam Agricultural University, Biswanath Chariali-784 176, India

*Corresponding Author Email : dibya.sreedutta01@gmail.com

 

Received: 29.05.2021                                                                                                       Revised: 01.08.2021                                                                          Accepted: 12.11.2021

 

 

Abstract

Aim: To record the prevalence, detection, molecular and biological characterization of phytoplasma associated with brinjal little leaf disease in Assam and its management.

Methodology: Roving survey was conducted during the 2018-2020 brinjal growing seasons to record the disease incidence and symptoms associated with the disease. Insect and dodder transmission studies were carried out along with tetracycline tests. Further, molecular detection of all the samples collected during the survey and after dodder and insect transmission studies were done through PCR assays by using universal primers.

Results: The disease incidence varied from 3.62 to 23.63 per cent in surveyed districts. Transmission studies revealed that Hishimonus phycitis (Dist.) is acting as a vector of brinjal little leaf phytoplasma and found to be transmitted by dodder (Cuscuta campestris). The phylogenetic analysis indicated that the Brinjal little leaf phytoplasma understudy was associated with ‘Candidatus phytoplasma trifolii’ and plants like Datura stramonium play a major role as potential alternate host of the phytoplasma. Further, studies on the effect of the antibiotic tetracycline hydrochloride in managing the disease elucidated that the antibiotic was effective only for temporary remission of symptoms.

Interpretation: This study reveals a broad picture about the incidence, phytoplasma associated with the disease, putative leafhopper vector transmitting the phytoplasma in the field, alternate host harbouring the phytoplasma, and effect of antibiotic on the disease suppression, which will be useful to develop effective management strategies.

Key words: Antibiotic, Brinjal little leaf disease, Hishimonus phycitis, Little leaf, Phytoplasma

 

 

 

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