Bean powdery mildew

Beans Powdery mildew Erysiphe polygoni Bordeaux mixture... 

Table I. Control of Bean Powdery Mildew (BPM) by a,a-Diphenylmethaneheterocyclic Compounds Applied at 400 ppm...

Another parameter investigated was the usefulness of different substituents other than hydrogen or hydroxyl on the Of-carbon. Table II provides the relative activity of several diphenylmethyl substituted 5-pyrimidines. Clearly, the hydroxyl substituted compound is the most active against bean powdery mildew. 

The activity of Of-carbon alkyl and cycloalkyl substitutions is presented in Table III. These data indicate that the or,Of-dicyclohexyl moiety is very active against bean powdery mildew. Further, the data indicate that the a-cycloalkyl-or-phenyl moieties are not only superior to a-alkyl-a-phenyl substitutions for powdery mildew control, but that they also confer some activity against cucumber anthracnose. Based on these and other data, the a,a-diphenyl substitution was considered to be the best choice. 

Table II. Activity of Diphenylmethyl-Substituted 5-Pyrimidines Against Bean Powdery Mildew...

V an Gestel etal. 980) prepared a series of substituted 1 -(2-phenyI-1,3-dioxolan-2-yl-methyl)-1,2,4-triazoles (60), ana evaluated them in the greenhouse for fungicidal activity. Compounds with 2,4-dichloro substitution on the phenyl ring and with a lower alkyl side chain on the dioxolane ring were found most promising for the control of powdery mildew on gherkins and barley, and for the control of bean rust. 

Kidney Bean Cray Mold Cucumber Powdery Mildew Rice Blast Wheat Brown Rust... 

Peas can be attacked by a range of pests including pea and bean weevil, pea cyst nematode, aphids, moths, thrips, pea midge, silver Y moth and slugs. Damping off, foot and root rot, leaf and pod spot, downy mildew, powdery mildew, botrytis, virus and bacterial blight can affect the pea erop and may need controlling. 

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