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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

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Front. Agric. China    2007, Vol. 1 Issue (1) : 43-46    https://doi.org/10.1007/s11703-007-0007-x
Research article
Screening for plant extracts to control potato late blight
Shutong WANG1,Tongle HU2,Fengqiao ZHANG2,R. Forrer H.3,Keqiang CAO2()
1 Bio-control Center of Plant Disease and Plant Pests of Hebei Province, College of Plant Protection, Agricultural University of Hebei, Baoding 071001, China, State Key Laboratory of Tropical Crop Biotechnology Institute of Bio-science and Biotechnology, Chinese Academy for Tropical Agricultural Sciences, Haikou 571101, China
2 Bio-control Center of Plant Disease and Plant Pests of Hebei Province, College of Plant Protection, Agricultural University of Hebei, Baoding 071001, China
3 Swiss Federal Research Station for Agroecology and Agriculture (FAL) Reckenholz, Zürich CH-8046, Switzerland
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Abstract

Six extracts from plant material (Galla chinensis, Potentilla erecta, Rheum rhabarbarum, Salviae officinalis, Sophora flavescens, and Terminalia chebula) were tested for controlling effects against the infection of Phytophthora infestans on detached potato leaves, seedlings, and tuber slices. On detached leaves, G. chinensis (2%), R. rhabarbarum (rhizome, 2%) and S. flavescens (2%) extracts showed a significant control effect, with a control efficacy of 96.67%, G. chinensis was the best. On seedlings R. rhabarbarum (rhizome, 2%) showed the best inhibiting effect, followed by S. flavescens (2%), T. chebula (1%), and G. chinensis (2%). The control efficacies were 91.67%, 75.00%, 70.24%, and 64.29%, respectively on the seventh day after inoculation. However, on potato slices, none of the plant extracts showed effective protection against infection and sporangia pro duction by P. infestans. The reason was analyzed and the potential for developing a natural fungicide based on these plant materials was discussed.
Keywords potato late blight      plant extracts      disease control     
Issue Date: 22 February 2016
 Cite this article:   
Tongle HU,Fengqiao ZHANG,R. Forrer H., et al. Screening for plant extracts to control potato late blight[J]. Front. Agric. China, 2007, 1(1): 43-46.
 URL:  
https://academic.hep.com.cn/fag/EN/10.1007/s11703-007-0007-x
https://academic.hep.com.cn/fag/EN/Y2007/V1/I1/43
Treatment Concentration/% Disease incidence1 /% Disease index1 Control efficacy /%
Water with Tween-20 0.0125 50.00 cd 35.71 b ―
Untreated control 0 75.00 abc 53.57 a ―
Salviae officinalis 2 83.33 a 34.52 b 35.56
Potentilla erecta 2 79.17 ab 33.93 b 36.67
Terminalia chebula 0.5 62.50 abcd 31.55 b 41.11
Terminalia chebula 1 75.00 abc 30.95 b 42.22
Sophora flavescens 0.5 58.33 abcd 27.38 bc 48.89
Rheum rhabarbarum 2 (foliage) 54.17 bcd 26.19 bc 51.11
Sophora flavescens 1 45.83 d 17.86 cd 66.67
Terminalia chebula 2 62.50 abcd 16.07 cd 70.00
Sophora flavescens 2 50.00 cd 13.10 de 75.56
Rheum rhabarbarum 2 (roots) 45.83 d 10.12 de 81.11
Galla chinensis 2 4.17 e 1.79 e 96.67
Table 1  Control effect of plant extracts on infection of detached potato leaves of cv. Agria by P. infestans
Treatment Concentration/% 7 days after inoculation 9 days after inoculation
Disease index1 Control efficacy/% Disease index1 Control efficacy/%
Water with Tween-20 0.0125 53.70 bc ― 75.93 abc ―
Untreated control 0 77.78 a ― 100.00 a ―
Potentilla erecta 2 66.67 ab 14.29 88.89 ab 11.11
Rheum rhabarbarum 2 (foliage) 41.67 cd 46.43 69.44 abc 30.56
Salviae officinalis 2 40.74 cd 47.62 88.89 ab 11.11
Sophora flavescens 0.5 37.04 cd 52.38 87.04 ab 12.96
Sophora flavescens 1 36.11 cd 53.57 57.41 bcd 42.59
Terminalia chebula 2 31.48 cd 59.52 75.93 abc 24.07
Terminalia chebula 0.5 31.48 cd 59.52 60.19 bcd 39.81
Galla chinensis 2 27.78 de 64.29 60.19 bcd 39.81
Terminalia chebula 1 23.15 de 70.24 42.59 cd 57.41
Sophora flavescens 2 19.44 de 75.00 81.48 abc 18.52
Rheum rhabarbarum 2 (roots) 6.48 e 91.67 27.78 d 72.22
Table 2  Control effect of plant extracts on infection of P. infestans on potato seedling (cv. Agria)
Treatment Concentration/% Disease incidence1/% Sporangia concentration /(x104 sporangia · mL-1)
Terminalia chebula 2 (seed) 100 5.08 a
Rheum rhabarbarum 2 (foliage) 100 3.21 ab
Galla chinensis 2 100 2.79 bc
Terminalia chebula 2 (fruit) 100 2.25 bc
Untreated control 0 100 2.04 bc
Potentilla erecta 2 100 2.00 bc
Salviae officinalis 2 100 1.92 bc
Rheum rhabarbarum 2 (root) 100 1.46 bc
Terminalia chebula 2 (skin) 100 1.33 bc
Sophora flavescens 2 100 0.83 bc
Table 3  Effect of plant extracts on the sporangia concentration of P. infestans on potato slices of the cv. Nicola
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