Khalil I. Al-Mughrabi
Partner: Potatoes New Brunswick; Hendrix and Dail, Inc., Simcoe, Ontario.
Abstract: A field experiment conducted in New Brunswick, assessed the efficacy of biopesticides (Bacillus subtilis, and Enterobacter cloacae),
soil fumigants (chloropicrin and Pic-Plus), and soil additives (MnSO4; and mustard meal) in controlling the common scab of potato. The trial consisted
of nine treatments: 1) untreated control; 2) seed treated with Serenade Max; 3) seed treated with E. cloacae (B-21050); 4) seed treated with fludioxonil
(Maxim PSP); 5) seed treated with Moncoat MZ; 6) seed planted in soil treated with mustard meal 3 days prior to planting; 7) seed planted in soil
fortified with manganese sulfate on the day of planting; 8) seed planted in soil treated with Pic-Plus; and 9) seed planted in soil treated with chloropicrin.
After harvest the tubers were sized and weighed and assessed for disease incidence and severity. All the treatments reduced the percentage of the total number
of scab infected tubers compared to the control. Although all treatments yielded higher total number of tubers compared to control, the only significant
difference was only noticed for the fludioxonil treatment. Yields were significantly higher in all treatments compared to the control. The results of the study
suggest that chloropicrin, Pic-Plus, fludioxonil, E. cloacae, manganese sulfate and mustard meal are viable options for managing common scab in potatoes.