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United States Department of Agriculture

Agricultural Research Service

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Location: Subtropical Plant Pathology Research

2013 Annual Report

1a. Objectives (from AD-416):
To establish the effectiveness of the experimental material for the control of soilborne pests associated with the production of strawberries and vegetables.

1b. Approach (from AD-416):
Replicated, repeated research trials will be conducted to compare the commercial standard in each crop with the experimental material. Two strawberry trials will be conducted in cooperation with Florida Agricultural Research in order to evaluate the movement of the material in the bed and its efficacy against sting nematode. Vegetable trials will be conducted using two different application methods to compare the efficacy of the experimental material compared to an untreated check and a methyl bromide control. Nematode, weed, and fungal populations will be assessed in each trial. Plots will be harvested based on the commercial standard for the crop.

3. Progress Report:
This research is related to inhouse project objective: 1. Develop new management strategies for control of pests and pathogens currently or previously controlled by soil fumigants in vegetable and ornamental cropping systems. Two strawberry trials were conducted at the Florida Strawberry Growers Association Dover Research Farm. These trials included five treatments: Untreated Check, two rates of the experimental material SPK applied through drip lines, InLineĀ® (Dow AgroSciences, 1,3-dichloropropene:chloropicrin, as the commercial standard), and the best non-chemical standard developed in a recently completed project. Treatments were replicated four times. The In-Line and SPK applications were performed using a standard drip application system developed by Dr. Joe Noling. The first season strawberry field trial was established in October 2010 and was completed in May 2011. The second season trial was established in September 2011 and was completed in March 2012. Generation of volatile organic compounds (VOCs) was monitored immediately after treatment, 24 hours, and one week after treatment. No VOCs were detected in any of the SPK-treated plots. Plots treated using a shank application of the high rate of SPK remained at a low pH for significantly longer than plots with the same rate applied through drip irrigation. There was a total of 23 picks for each strawberry season harvest. Total weight of fruit was numerically lowest in the UTC and anaerobic soil disinfestations (ASD) plots; however there were no statistically significant differences among any treatment in the first year. Improvements in crop nutrition in the second strawberry season resulted in the highest yield occurring in ASD-treated plots.

4. Accomplishments

Last Modified: 05/25/2017
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