Premium
Studies in vitro and in vivo with powdery mildew fungicides
Author(s) -
CLIFFORD D. R.,
HISLOP E. C.
Publication year - 1973
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.1744-7348.1973.tb00937.x
Subject(s) - powdery mildew , fungicide , biology , conidium , germination , in vivo , in vitro , penetration (warfare) , botany , mildew , horticulture , biochemistry , microbiology and biotechnology , operations research , engineering
SUMMARY Droplets of 4‐(i‐cycloalkylalkyl)‐2,6‐dinitrophenols often protect areas of leaf very much greater than that of the initial deposit against powdery mildew. For a given alkyldinitrophenol, this type of protection is greater on apple than on marrow leaves. This zonal protection is not correlated with vapour activity in vitro or in vivo , or with inhibition of conidial germination in vitro , but is correlated with the degree of protection obtained when leaves are sprayed to give good cover. By contrast, crotonic esters of these alkyl‐dinitrophenols do not show zonal activity, but nevertheless often exhibit protectant activity comparable with that of the parent phenols. These results suggest that exploitation of favourable hydrogen bonding characteristics in the fungicide molecule may lead to better control of fungal diseases in the field as a result of enhanced movement of fungicide in or on the leaf cuticle (zonal movement) or easier penetration of the fungal conidium.