Disease-reducing effect of Chromolaena odorata extract on sheath blight and other rice diseases

TY - JOUR

T1 - Disease-reducing effect of Chromolaena odorata extract on sheath blight and other rice diseases

AU - Nguyen, Dac Khoa

AU - Thuy, Phan Thi Hong

AU - Thuy, Tran Thi Thu

AU - Collinge, David B.

AU - Jørgensen, Hans Jørgen Lyngs

PY - 2011/2

Y1 - 2011/2

N2 - Sheath blight caused by Rhizoctonia solani (teleomorph: Thanate-phorus cucumeris) is a major cause of crop loss in intensive rice production systems. No economically viable control methods have been developed. We screened aqueous extracts of common herbal plants that could reduce sheath blight lesions and found that foliar spraying and seed soaking application of extracts of either fresh or dried leaves of Chromolaena odorata gave up to 68% reduction in sheath blight lesion lengths under controlled and semi-field conditions. The observed reductions were not dependent on growth conditions of C. odorata and rice cultivar. The effect was observed until 21 days after inoculation and was not dependent on microbial activity. Under semi-field conditions, extracts also reduced severity of other important rice diseases, i.e., blast (Pyricularia oryzae) using foliar spray (up to 45%), brown spot (Bipolaris oryzae) using seed treatment (up to 57%), and bacterial blight (Xantho-monas oryzae pv. oryzae) using both application methods (up to 50%).

AB - Sheath blight caused by Rhizoctonia solani (teleomorph: Thanate-phorus cucumeris) is a major cause of crop loss in intensive rice production systems. No economically viable control methods have been developed. We screened aqueous extracts of common herbal plants that could reduce sheath blight lesions and found that foliar spraying and seed soaking application of extracts of either fresh or dried leaves of Chromolaena odorata gave up to 68% reduction in sheath blight lesion lengths under controlled and semi-field conditions. The observed reductions were not dependent on growth conditions of C. odorata and rice cultivar. The effect was observed until 21 days after inoculation and was not dependent on microbial activity. Under semi-field conditions, extracts also reduced severity of other important rice diseases, i.e., blast (Pyricularia oryzae) using foliar spray (up to 45%), brown spot (Bipolaris oryzae) using seed treatment (up to 57%), and bacterial blight (Xantho-monas oryzae pv. oryzae) using both application methods (up to 50%).

U2 - 10.1094/phyto-04-10-0113

DO - 10.1094/phyto-04-10-0113

M3 - Journal article

C2 - 20839964

SN - 0031-949X

VL - 101

SP - 231

EP - 240

JO - Phytopathology

JF - Phytopathology

IS - 2

ER -