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ARS Home » Southeast Area » Byron, Georgia » Fruit and Tree Nut Research » Research » Publications at this Location » Publication #321460

Research Project: Mitigating Alternate Bearing of Pecan

Location: Fruit and Tree Nut Research

Title: Efficacy of Prophyt when combined with Captec for control of peach scab in Alabama, 2014

Author
item Sikora, Ed - Auburn University
item Pitts, J. - Auburn University
item Brannen, Phillip - University Of Georgia
item Bock, Clive
item Hotchkiss, Michael - Mike

Submitted to: Plant Disease Management Reports
Publication Type: Other
Publication Acceptance Date: 6/1/2015
Publication Date: 8/1/2015
Citation: Sikora, E., Pitts, J., Brannen, P.M., Bock, C.H., Hotchkiss, M.W. 2015. Efficacy of Prophyt when combined with Captec for control of peach scab in Alabama, 2014. Plant Disease Management Reports. 9:STF005.

Interpretive Summary: Fungicides were evaluated for control of scab in a mid-ripening peach experimental block in Clanton, AL. Treatment regimens included a non-treated control, Captec 4L, Prophyt, Captec 4L + Prophyt, and Bravo Weather Stik. Scab incidence (percent infected fruit) and severity (lesions per fruit) were recorded on the day of harvest. Neither Prophyt nor Captec alone at the specified rates provided scab suppression. A significant increase in scab severity was observed with the Prophyt treatment as compared to the non-treated control; however, disease incidence of Prophyt and the non-treated control were not statistically different, and one can more logically conclude that solo applications of Prophyt do not provide efficacy against peach scab. Results from this trial do not support the use of Captec and Prophyt in combination. The only treatment that provided a significant level of control was Bravo Weather Stik (chlorothalonil).

Technical Abstract: Fungicides were evaluated for control of scab in a mid-ripening peach experimental block (‘Ruston Red’) located at the Chilton Area Research and Extension Center located in Clanton, AL. Chemical formulations were applied with an airblast sprayer (100 gal/A spray volume) at the petal fall and shuck split stages, and two subsequent cover sprays. Application dates were 2, 8, 16 and 23 Apr, respectively. Treatment regimens included a non-treated control, Captec 4L, Prophyt, Captec 4L + Prophyt, and Bravo Weather Stik. Four replications of each treatment were applied to a randomized complete block design, with each plot consisting of four trees; the outer two trees in each plot were not utilized for ratings. An unsprayed guard row was left between each treatment row. All orchard cultural management was in keeping with peach production methods commonly practiced throughout the Southeast. At full maturity, 40 fruit were harvested from each plot for scab assessments (15 Jul). Scab incidence (percent infected fruit) and severity (lesions per fruit) were recorded on the day of harvest. Neither Prophyt nor Captec alone at the specified rates provided scab suppression. A significant increase in scab severity was observed with the Prophyt treatment as compared to the non-treated control; however, disease incidence of Prophyt and the non-treated control were not statistically different, and one can more logically conclude that solo applications of Prophyt do not provide efficacy against peach scab. Previous trials have provided encouraging results with the combination of Prophyt and contact fungicides such as Captec. However, results from this trial do not support the use of Captec and Prophyt in combination. The only treatment that provided a significant level of control was Bravo Weather Stik (chlorothalonil).