Articles
Evaluation of biocontrol solutions against Pythium of carrot in the field
Article number
1264_32
Pages
263 – 268
Language
English
Abstract
In South West France region Nouvelle Aquitaine which produces 40% of the national French carrot production for fresh market, Pythium sulcatum causes damage on carrot crops with more or less large spots on the roots.
In this region, losses due to Pythium are most important with carrots grown during summer and stored in the field during winter (10%) than with carrots grown and harvested in summer (5%); the least losses are observed in crops sown during winter, covered with plastic up to April and harvested in June (2%). To avoid crop losses, growers used to apply metalaxyl-M once at sowing and sometimes once again one month later.
Alternative commercial solutions with biocontrol agents to control carrot Pythium disease do exist but less is known about their efficiency in field conditions in Nouvelle Aquitaine.
This study aimed to evaluate efficiency of biocontrol agents, to reduce Pythium damage in field conditions.
Four field trials were conducted in 2016 and 2017, five products with biocontrol agents were tested Rhizocell® (Bacillus amyloliquefaciens, 1 trial), Prestop (Gliocladium catenulatum, 2 trials), Tri-Soil® (Trichoderma atroviride, 4 trials), Xedavir (Trichoderma asperellum, 2 trials), Trianum-P (Trichoderma harzianum, 2 trials) and compared to untreated and metalaxyl-M checks.
In all the trials, in untreated check, epidemy showed a low intensity (about 5 spots per carrot) but a high frequency of attack (from 17 to 86% of diseased carrots depending of the trial). In our field conditions Tri-Soil® recorded a significant efficiency in 1 trial per 4, and reduced Pythium attacks from 63 to 27% of diseased carrots, compared to metalaxyl-M or untreated checks.
Results are discussed according to soil temperature, application conditions, chemical products applied during the carrot cultivation and organic matter incorporated before carrot cropping.
In this region, losses due to Pythium are most important with carrots grown during summer and stored in the field during winter (10%) than with carrots grown and harvested in summer (5%); the least losses are observed in crops sown during winter, covered with plastic up to April and harvested in June (2%). To avoid crop losses, growers used to apply metalaxyl-M once at sowing and sometimes once again one month later.
Alternative commercial solutions with biocontrol agents to control carrot Pythium disease do exist but less is known about their efficiency in field conditions in Nouvelle Aquitaine.
This study aimed to evaluate efficiency of biocontrol agents, to reduce Pythium damage in field conditions.
Four field trials were conducted in 2016 and 2017, five products with biocontrol agents were tested Rhizocell® (Bacillus amyloliquefaciens, 1 trial), Prestop (Gliocladium catenulatum, 2 trials), Tri-Soil® (Trichoderma atroviride, 4 trials), Xedavir (Trichoderma asperellum, 2 trials), Trianum-P (Trichoderma harzianum, 2 trials) and compared to untreated and metalaxyl-M checks.
In all the trials, in untreated check, epidemy showed a low intensity (about 5 spots per carrot) but a high frequency of attack (from 17 to 86% of diseased carrots depending of the trial). In our field conditions Tri-Soil® recorded a significant efficiency in 1 trial per 4, and reduced Pythium attacks from 63 to 27% of diseased carrots, compared to metalaxyl-M or untreated checks.
Results are discussed according to soil temperature, application conditions, chemical products applied during the carrot cultivation and organic matter incorporated before carrot cropping.
Authors
C. Béasse, S. Bellalou
Keywords
Pythium sulcatum, carrot root, biological preparations, field cultivation, podzols
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