Rice blast

Rice blast Rice bran Rice brand oil Rice bran oil... 

Allyloxy-l,2-benzisothiazole 1,1-dioxide (232), known as Probenazole or Oryzaemate, is useful in the control of rice blast fungus under field conditions (75SST(3)54l). 

During the synthesis of a new rice blast disease fungicide, the 5-hydroxy-l,2,4-oxadiazole 90 underwent reaction on the 4-nitrogen to furnish the 4-substituted-l,2,4-oxadiazol-5-one 91 as shown in Equation (8) <2002JPES221>. 

A recent search for general and specific elicitors from L. maculans demonstrated that the phytotoxins sirodesmin PL (1) and deacetylsirodesmin PL (2) are general elicitors since both induced the production of phytoalexins in resistant brown mustard and in susceptible canola [31]. Furthermore, two specific elicitors, a mixture of cerebrosides C (13) and D (14), were reported from mycelia of liquid cultures of L. maculans virulent on canola (Fig. 9.5) [19]. Previously, cerebrosides C (13) and D(14) were reported from a number of phytopathogenic fungi and were reported to induce the production of phytoalexins in rice plants and disease resistance to the rice blast fungus [32]. 

Bean PM Cuke A Rice Blast Apple Scab Bean Rust (Systemic) ... 

With respect to five-membered lactones fused to hexopyranose units, some approaches have been reported so far and the exploitation of their synthetic potential has led to the access of new carbohydrate derivatives. Bicyclic derivatives of this type are key intermediates in the synthesis of the epimer at C-3 of the sugar moiety contained in miharamycins [212, 213]. The latter are antibiotics known to inhibit strongly Pyricularia oryzae, which produces the rice blast disease. These compounds are also considered to be a potential bioterrorism agent (Scheme 42). Hence, the 3,3-spiroepoxide 176 was converted into the 3-C-cyanomethyl derivative 177, the hydrolysis of which led to spontaneous cyclization in the presence of... 

Kato, T., Y. Yamaguchi, T. Namai, and T. Hirukawa. Oxygenated fatty acids with anti-rice blast fungus activity in rice plants. Biosci Biotech Biochem 1993 57(2) 283-287. 

OS 120 Akatsuka, T., O. Kodama, H. Kato, Y. Kono, and S. Takeuchi. 3-Hydroxy-7-oxo-sandaaraco-primaradiene (Oryzalexin A), a new phytolexin isolated from rice blast leaves. Agr Biol Chem 1983 47(2) 445-447. 

OS123 Kono, Y., S. Takeuchi, O. Kodama, and T. Akatsuka. Absolute configuration of Oryzalexin A and structures of its related phytoalexins isolated from rice blast leaves infected with Pyricularia oryzae. Agr Biol Chem 1984 48(1) 253-255. 

Monosubstituted pyrrolo[2,3- ]pyridine derivatives substituted at positions 2 or 6 of the ring system, 26, exhibit antifungal activity against Pyricularia oryzae, a fungus that causes rice blast <1997JFA2345>. 

Edifenphos, O-ethyl 5,5-diphenyl phosphorodithioate, was announced in 1968 and introduced commercially by Bayer AG for the control of rice blast, Pyricularia oryzae. Iprobenfos, 5-benzyl 0,0-diisopropyl phosphorothioate, was introduced by Kumiai Chemical... 

The organisms Pyricularia oryzae, which causes rice blast, and Helminthosporium oryzae, which causes brown leaf spot, can be controlled with complexes of the ligands 1-phenyl-3-methyl-4-nitroso-2-pyrazolin-5-one (36) and 3-methyl-4-nitroso-2-pyrazolin-5-one (37). The complexes were of the type ML Xj (L = 36, 37 X = C1-, Br, N03 ) or [ML2]Y2 (Y = C104 ). The former were assigned an octahedral or distorted octahedral structure and the latter are tetrahedral. The most active nickel complex was (38).92... 

Sekizawa, Y. (1983) Mode of Action of Rice Blast Protectant Pro-benazole. In Pesticide Chemistry, Human Welfare and the Environment, Vol. 3 Mode of Action, Metabolism and Toxicology (editors J. Miyamoto and P.C. Kearney), Pergamon Press, 147-152. 

Akatsuka, T., Kodama, Q, Sekido, H., Kono, Y, Takeuchi, S. Novel phytoalexins ( Oryzalexins A, B and C) isolated from rice blast leaves infected with Pyricularia oryxae. Part I Isolation, characterization and biological activities of oryzalexins. Agric Biol Chem 1985 49 1689-1694. 

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