ISHS Acta Horticulturae 818: I International Symposium on Pomegranate and Minor Mediterranean Fruits
EPIDEMIOLOGY AND MANAGEMENT OF BACTERIAL BLIGHT OF POMEGRANATE CAUSED BY XANTHOMONAS AXONOPODIS PV. PUNICAE |
| Authors: | R. Kumar, M.R. Shamarao Jahagirdar, S.T. Yenjerappa, H.B. Patil |
| Keywords: | pomegranate, bacterial blight, epidemiology, management, antibiotics |
| Abstract:
Bacterial blight of pomegranate caused by Xanthomonas axonopodis pv. punicae (Hingorani and Singh) Vauterin et al. has become an increasingly serious threat for pomegranate growers of the states Andhra Pradesh, Maharastra and Karnataka State of the Indian Subcontinent. The disease was most severe in Karnataka and recorded in a range of 60 to 90 percent incidence. The increase in day temperature (38.6°C) and afternoon relative humidity of 30.4% along with cloudy weather and intermittent rainfall favoured the disease initiation and further spread of the disease. The pathogen overwinters in infected leaves of neem and bail planted along the bund of pomegranate fields. The continuous growing of pomegranate over three seasons has lead to increased susceptibility of the crop in this part of the geographical area. The field evaluation of different antibiotics / antibactericides was tested during 2004 and 2005 and revealed that application of Bromopal at (500 ppm) + Copper oxychloride at (2,000 ppm) and followed by Zinc sulphate 1.0 g + Magnesium sulphate 1.0 g + Boron 1.0 g + Lime 1.0 g / lit. sprayed one day after spray of chemicals or streptocycline at (500 ppm) + Copper oxychloride at (2,000 ppm) was found effective in controlling the disease recording 19.08 percent and 19.65 percent incidence, compared to control 78.65 percent incidence after 5th sprays at 10 days intervals. The plant that received the spray of Bromopol at (500 ppm) + Copper oxychloride at 2,000 ppm recorded maximum yield of 8.03 t/ha. followed by Streptocycline at 500 ppm + Copper oxychloride at 2,000 ppm 7.74 t / ha. However minimum yield of 1.34 t / ha. was recorded in untreated control. The search for resistant clones forms the basis for a successful management of this disease in the future globally. The present research paper comprised various aspects of disease epidemiology and management. | |
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