[en] Field experiments were conducted in 2010 to investigate the effect of
fungicide commercial formulation, timing and dosages on the severity of these
two diseases in winter wheat in Luxembourg. Different types of fungicides
and fungicide combinations containing active ingredients such as triazoles and
strobilurins were used in field trials including susceptible cultivars to Septoria
leaf blotch (SLB, caused by Septoria tritici) and wheat leaf rust (WLR, caused
by Puccinia triticina). The three formulations of fungicides tested were: (i) a
mix of triazole and amine (Prothioconazole 250 g/l + Spiroxamine 500 g/l)
associated with chlorothalonil 500 g/l, (ii) sole strobilurin (Azoxystrobine 250
g/l), and (iii) a mix of strobilurin and triazole (Epoxiconazole 125 g/l;
Azoxystrobine 250 g/l). The optimum time of fungicide spray was assessed
through the mechanistic model PROCULTURE and a stochastic model based
on night favourable weather conditions conducive to WLR development.
The results showed that for plots treated with fungicide formulation
containing either a triazole or a strobilurin, the grain yield earned was not
significantly different from the untreated plots (P > 0.05). Whereas single
fungicide treatment involving a mixture of triazole and strobilurin at the
optimum time gave an earning (on average 7 dt ha-1) compare to the control
and a yield similar to that obtained with the double or triple fungicide
treatments.
Research center :
Centre de Recherche Public Gabriel Lippmann
Disciplines :
Agriculture & agronomy
Author, co-author :
El Jarroudi, Moussa ; Université de Liège - ULiège > DER Sc. et gest. de l'environnement (Arlon Campus Environ.) > DER Sc. et gest. de l'environnement (Arlon Campus Environ.)
Tychon, Bernard ; Université de Liège - ULiège > DER Sc. et gest. de l'environnement (Arlon Campus Environ.) > Agrométéorologie (relation agriculture-environ. physique)
Delfosse, Philippe
Language :
English
Title :
Operational warning for Septoria leaf blotch and leaf rust in winter wheat: Importance of fungicide dosage, formulation, and spray time