Screening extracts of Achyranthes japonica and Rumex crispus for activity against various plant pathogenic fungi and control of powdery mildew.
Methanol extracts of fresh materials of 183 plants were screened for in vivo antifungal activity against Magnaporthe grisea, Corticium sasaki, Botrytis cinerea, Phytophthora infestans, Puccinia recondita and Erysiphe graminis f sp hordei. Among them, 33 plant extracts showed disease-control efficacy of more than 90% against at least one of six plant diseases. The methanol extracts of Achyranthes japonica (whole plant) and Rumex crispus (roots) at concentrations greater than 11 g fresh weight of plant tissue per litre of aqueous Tween 20 solution effectively controlled the development of barley powdery mildew caused by E graminis f sp hordei in an in vivo assay using plant seedlings. At a concentration of 300 g fresh weight of plant tissue per litre of Tween 20 solution, the two extracts were as efficient as the fungicide fenarimol (30 mg litre(-1)) and more active than the fungicide polyoxin B (100 and 33 mg litre(-1)) against Sphaerotheca fuliginea on cucumber plants in glasshouse trials.
Kim
Jin-Cheol
JC
Biological Function Research Team, Korea Research Institute of Chemical Technology, Yusong-Gu, Taejon, Korea. kjinc@krict.re.kr
Choi
Gyung Ja
GJ
Lee
Seon-Woo
SW
Kim
Jin-Seog
JS
Chung
Kyu Young
KY
Cho
Kwang Yun
KY
D029044:Achyranthes / Q000633:toxicity*; D020171:Botrytis / Q000187:drug effects / Q000254:growth & development; D005658:Fungi / Q000187:drug effects* / Q000254:growth & development; D005659:Fungicides, Industrial / Q000633:toxicity; D020082:Magnaporthe / Q000187:drug effects / Q000254:growth & development; D010838:Phytophthora / Q000187:drug effects / Q000254:growth & development; D010935:Plant Diseases / Q000382:microbiology*; D010936:Plant Extracts / Q000633:toxicity*; D011741:Pyrimidine Nucleosides / Q000633:toxicity; D011743:Pyrimidines / Q000633:toxicity; D031804:Rumex / Q000633:toxicity*
D005659:Fungicides, Industrial; D010936:Plant Extracts; D011741:Pyrimidine Nucleosides; D011743:Pyrimidines; C002457:polyoxin; C033789:fenarimol