Articles
MANAGEMENT OF BACTERIAL BLIGHT OF POMEGRANATE THROUGH CULTURAL METHODS
Article number
890_68
Pages
485 – 490
Language
English
Abstract
Bacterial blight of pomegranate caused by Xanthomonas axonopodis pv. punicae, once deemed as a disease of minor importance broke out severely during 2001-2002 in all the pomegranate growing areas of northern Karnataka.
The disease resulted in heavy loss of fruit yield and quality.
Even heavy chemical protection adopted by the farmers went in vain due to heavy inoculum build up and faster spread of the disease.
Trials were taken up in farmers fields during 2003-2004, to assess the effect of cultural practices such as different dates of pruning and the role of the rest period given to the crop in mitigating the bacterial blight effectively.
To see the effect of dates of pruning, crop pruned in six different dates from September to November at fortnight intervals was constantly observed for bacterial blight intensity.
For studying the role of the rest period, crop given different lengths of rest from one to six months was observed for bacterial blight severity.
Results revealed that a very negligible bacterial blight index to the extent of 15.8 and 13.8% was recorded in September first and second fortnight pruned crop.
Moderate disease intensity was recorded in October pruned crop and more disease severity of 60.7% was recorded in November second fortnight pruned crop owing to the prevalence of congenial weather factors such as temperature, relative humidity and rainfall.
Results of the study on rest period indicated that minimum disease index of 6.59% was recorded in the crop given six months rest and high disease severity of 80.36% was recorded in crop given one month rest, the reason being the presence of a heavy amount of inoculum carried from the previous crop to the subsequent crop given one month rest.
On the contrary, inoculum build up was much less in the crop given a longer rest period of six months, which resulted in lower disease incidence.
The disease resulted in heavy loss of fruit yield and quality.
Even heavy chemical protection adopted by the farmers went in vain due to heavy inoculum build up and faster spread of the disease.
Trials were taken up in farmers fields during 2003-2004, to assess the effect of cultural practices such as different dates of pruning and the role of the rest period given to the crop in mitigating the bacterial blight effectively.
To see the effect of dates of pruning, crop pruned in six different dates from September to November at fortnight intervals was constantly observed for bacterial blight intensity.
For studying the role of the rest period, crop given different lengths of rest from one to six months was observed for bacterial blight severity.
Results revealed that a very negligible bacterial blight index to the extent of 15.8 and 13.8% was recorded in September first and second fortnight pruned crop.
Moderate disease intensity was recorded in October pruned crop and more disease severity of 60.7% was recorded in November second fortnight pruned crop owing to the prevalence of congenial weather factors such as temperature, relative humidity and rainfall.
Results of the study on rest period indicated that minimum disease index of 6.59% was recorded in the crop given six months rest and high disease severity of 80.36% was recorded in crop given one month rest, the reason being the presence of a heavy amount of inoculum carried from the previous crop to the subsequent crop given one month rest.
On the contrary, inoculum build up was much less in the crop given a longer rest period of six months, which resulted in lower disease incidence.
Publication
Authors
S.T. Yenjerappa, V.B. Nargund, R.S. Jawada
Keywords
Xanthomonas axonopodis pv. punicae, Punica granatum, control, cultural practices
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