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Field experiments on sugar‐beet powdery mildew, Erysiphe betae
Author(s) -
BYFORD W. J.
Publication year - 1978
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1978.tb00728.x
Subject(s) - powdery mildew , benomyl , biology , mildew , agronomy , sugar beet , sugar , yield (engineering) , balsam , horticulture , fungicide , biochemistry , materials science , metallurgy
SUMMARY Sugar‐beet powdery mildew, Erysiphe betae appeared in East Anglia in late July 1976 and became wide‐spread in eastern England during August and September but was scarce in crops in the north and west of England. Fentinhydroxide, sulphur, benomyl and ethirimol controlled the disease but benomyl applied once only and ethirimol were less effective than the other materials. In heavily infected crops two sulphur sprays, the first applied at the onset of the mildew attack, increased sugar yield by 13%. A single early sulphur spray increased yield on average by 9% giving a return of six to seven times the cost of treatment. When the first spray was delayed, mildew control was less effective.