Prevalence and management of citrus canker of Lime (citrus auranlifolia)under jammu subtropics
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Date
2024-02-02
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Sher-e-Kashmir University of Agricultural Sciences & Technology of Jammu
Abstract
Among agricultural pests and diseases that threaten citrus crops, citrus canker is one of the most devastating diseases. The disease is caused by Xonihomonas axonopodis pv. cifri and occurs in large number of countries including India. At least 3 distinct types of citrus cankcr are recognized and among these, Asiatic form (Canker A) is most destructive and affecting major citrus cultivars. Severe infection of the disease produces a variety of effects including defoliation, dieback, severely bleinished fruit, reduced fruit quality and premature fruit drop. Extensive survey of different citrus growing areas of Jammu division was conducted during 2022-23 and it was revealed that highest PDI was recorded in district Sainba and least PDI was recorded in district Reasi. However, among the locations, irrespective of the concerned districts, maximum PDI was recorded in Amli of district Samba and least was recorded in Pouni of district Reasi. Weather parameters plays a crucial role in disease development of citrus canker and it was found during the present study that maximum temperature and maximum Relative humidity was positively correlated to disease development. During the dual culture assay Pseudomonas fluorescens was found highly effective with a inhibition zone of 14.56 mm while Trichoderma Asperllum(6.89 mm) was found least effective. However, In vitro evaluation of botanicals revelaed that garlic extract was found highly effective with maximum inhibition zone of 9.66, 7.56 and 4.13 mm. Among the chemicals, copper oxychloride was ti›und highly effective with maximum inhibition zone of 22.78, 17.32, 15.90, and I 3.85 mm while among antibiotic, minimum inhibition zone of 20,04, 15.32, 10.73 and 8.1 1 mm was recorded in tetracycline hydrochloride followed by norfloxacin (13.78, 10.90, 7.b0 and 4.34 mmJ. Management of disease through cultural practices showed that Basin making+ Black film mulch+
Training and pruning of twigs+ Burning of fallen leaves gave minimum PDI of
26.28 % with a PDC of 44.36 per cent. From the present investigation it was found that
djs 9by gq sfully managed by integrating the cultural practices like Bairn mâking+ black film mulch+ Training and pruning of twigs+ Burning of tallen leavm with three sprays of tetracycline hydrochloride (250 ppm} + Copper oxychloride (2000 ppm) + Garlic (20 %) at an iqt als of 30 days.
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Citation
Bhagat, Rakesh Kumar. 2023. Prevalence and management of Citrus canker of lime (Citrus aurantifolia) under Jammu Subtropics.