Distribution and Severity of Turcicum Leaf Blight of Maize caused by Exserohilum turcicum (Pass.) Leonard and Suggs. in Northern parts of Karnataka

Author: Meghana S. P.*, S. I. Harlapur, Ranjana Joshi and Pavitra

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Abstract

Maize (Zea mays L.) is the third most important cereal crop in India after wheat and rice in terms of production and productivity. Among various foliar diseases affecting the maize, turcicum leaf blight (TLB) caused by Exserohilum turcicum has become a major limiting factor for maize production affecting photosynthesis with severe reduction in grain yield to an extent of 28 to 91%. The disease effect leads to qualitative changes in the seed resulting in reduced germination capacity and decreased sugar content. In order to get comprehensive information on disease prevalence, level of incidence and severity, to prepare a disease distribution map and for hot spot location for screening of genotypes against disease resistance, a roving survey was carried out during kharif 2018-19 in major maize growing districts of northern parts of Karnataka viz., Bagalkot, Belagavi, Dharwad, Haveri and Uttara Kannada. The disease severity varied from 35.61% to 52.84%. The maximum disease severity of tur

Keywords

Maize, Turcicum leaf blight, Exserohilum turcicum, Disease severity.

Conclusion

The results of roving survey carried out during kharif 2018 in Bagalkot, Belagavi, Dharwad, Haveri and Uttara Kannada districts revealed that maximum disease severity (52.84 PDI) of turcicum leaf blight was recorded in Sanavalli village of Uttara Kannada district. The district wise mean disease severity was maximum in Haveri district (50.61 PDI). In order to identify the effect of rhythmic changes in the different crop grown conditions on incidence and severity of the disease and to know the status of the resistance in commercial high yielding hybrids, the survey and surveillance of the disease shall be carried out every year in different agro climatic regions in different seasons.

References

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How to cite this article

Meghana S. P.*, S. I. Harlapur, Ranjana Joshi and Pavitra (2022). Distribution and Severity of Turcicum Leaf Blight of Maize caused by Exserohilum turcicum (Pass.) Leonard and Suggs. in Northern parts of Karnataka. Biological Forum – An International Jo