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Akoijam, Romila
- Occurrence, Severity and Association of Fungal Pathogen, Botrydiplodia theobromae with Sudden Death or Decline of Tree Bean (Parkia timoriana, (DC.) Merr) in North Eastern India
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PDF Views:116
Authors
A. Ratankumar Singh
1,
S. K. Dutta
1,
S. B. Singh
1,
T. Boopathi
1,
S. Lungmuana
1,
S. Saha
1,
Vishambhar Dayal
1,
Romila Akoijam
2,
S. K. Sharma
2,
N. Hemanta Singh
2
Affiliations
1 ICAR Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
2 ICAR Research Complex for NEH Region, Manipur Centre, Lamphelphat 795 004, IN
1 ICAR Research Complex for NEH Region, Mizoram Centre, Kolasib 796 081, IN
2 ICAR Research Complex for NEH Region, Manipur Centre, Lamphelphat 795 004, IN
Source
Current Science, Vol 115, No 6 (2018), Pagination: 1133-1142Abstract
Tree bean, Parkia timoriana is one of the most important perennial tree legume vegetable crops in north eastern region (NER) of India. Recently, sudden death or decline is emerging as a major constraint in the production of tree bean. The prevalence, intensity and etiology of this disease have not been extensively studied. The present work was aimed at studying the symptomology, severity and etiology of sudden death or decline of tree bean in the north eastern region of India. Typical symptoms of tree bean decline were initiated with wilting of half portion of the tree, excessive shedding of leaves, gradual drying up leading to death, and secondary infestation by insects on dead trees. The highest disease severity of 68.5% was observed in warmer regions like Kolasib, Mizoram. During survey, small bark borer was recorded in all districts and levels of infestation rate (holes/ft2 of log) reached maximum up to 25.49 in Hnanthial of Lunglei district. Young trees in the range 1–10 years with 57.32% (917 trees) of total trees (1600) infected were most susceptible to the disease compared to 12.58% (201 trees) infection in old trees in the range 21–30 years. The frequently associated pathogen with sudden death or decline of tree bean was identified as Botrydiplodia theobromae at the Indian Type Culture Collection, ICAR-IARI, New Delhi. It was the most aggressive species and proven to be pathogenic to tree bean following artificial inoculation.Keywords
Botrydiplodia theobromae, North Eastern India, Parkia timoriana, Sudden Death or Decline Disease, Tree Bean.References
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- New Record of Spiralling Whitefly Aleurodicus dispersus Russell on Brinjal From Manipur
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PDF Views:75
Authors
Affiliations
1 Department of Entomology, Assam Agricultural University, Jorhat, 785013, Assam, IN
2 ICAR Research Complex for North Eastern Hill Region, Manipur Centre, Lamphelpat, 795004, Manipur, IN
1 Department of Entomology, Assam Agricultural University, Jorhat, 785013, Assam, IN
2 ICAR Research Complex for North Eastern Hill Region, Manipur Centre, Lamphelpat, 795004, Manipur, IN
Source
Indian Journal of Entomology, Vol 84, No 4 (2022), Pagination: 931-932Abstract
The spiraling whitefly Aleurodicus dispersus Russell was found infesting brinjal in Imphal, Manipur during October 2020 and January 2021, with lifestages getting completed on leaves. The spiraling nature was also found with heavily infested leaves getting crinkled before drying out. The honey dew and black sooty moulds symptoms were also observed. Moderate infestation was found during rainy season but it was heavy during November to December. The biopesticide Verticillium lecanii was found to be effective with incidence and the number of spirals observed to be reduced within seven days.Keywords
Aleurodicus dispersus, Verticillium lecanii, brinjal, leaves, spiralling, sooty mould, honey dew, weather factors, lifestages, infestationReferences
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