Effect of Companion Foliar Spray Application for Control of Anthracnose Fruit Rot (Colletotrichum acutatum) on Strawberry (Fragaria x ananassa) Cultivar ‘Chandler’ in North Carolina, 2015.
Biological Applied Research Inc.,
Dr. James Driver
Raleigh, NC 27603

Objective: To evaluate the efficacy of Companion Biological Fungicide, for disease control and increased yield, compared to conventional fungicides, in Strawberry plants.
Method: An independent trial conducted at the Biological Applied Research Inc., research farm in Elm City, NC compared applications of Companion Biological Fungicide to combination treatments of the conventional fungicides; Captan 50WP, Topsin-M, Pristine 38WG & Switch 62.5WG.

Plots were established in Norfolk, sandy loam soil on 16-Oct (2014) on 8-in high, 30-in wide, black VIF, 1.25-mil plastic-mulched beds. Individual plots were 12-ft long and consisted of two staggered rows of 24 plants, separated by 3-ft (within beds).

Treatments were randomized in four replicated complete blocks, and applied on a weekly basis starting 12-May through 2-Jun, with a total of 4 spray applications. A CO2 backpack Sprayer was used to deliver the applications at a rate of 100-gal/A.

Companion was applied at rates of 1, 2, & 3 Quarts/A, weekly. A program of four convention fungicides was applied as follows: Captan 50WP + Topsin-M at 4 + 1lbs./A during the first and third weekly applications, Pristine 38WG at 23-oz/A during the second weekly applications, and Switch 62.5WG at 11-oz/A during the fourth weekly applications.

Harvests were made weekly, starting 19-May through 5-Jun, with a total of three harvests throughout the trial. The number of berries and weight was used to determine the total yield, percent of marketable yield and diseased fruit (expressed as a percentage of the total diseased + marketable fruit).

Results: With modest Anthracnose disease pressure, Spring 2015, the untreated check was the most infected by the disease, and produced the least amount of marketable fruit, with the lowest weight. The highest marketable fruit yield, by weight, was with Companion treatments of 1 quart/A and 2 quarts/A.


Control of Anthracnose Fruit Rot Average Fruit Weight in Grams
strawberry_research

Anthracnose Strawberry Trial, 2014-2015
4 treatments weekly.
Biological Applied Research Inc., Raleigh, NC


Companion delivered outstanding results in Average Fruit Weight (grams). The yield weight for the Companion 1 quart/A application was 9.5% higher than that of the combination fungicide application (Captan 50WP, Topsin-M, Pristine 38WG & Switch 62.5WG) and 93.8% more than that of the untreated check.


Control of Anthracnose Fruit Rot Total Marketable Fruit Count
strawberry_research

Anthracnose Strawberry Trial, 2014-2015
4 treatments weekly.
Biological Applied Research Inc., Raleigh, NC



Companion applications of 2 quarts/A & 1 quart/A also produced 13.3% and 24.6%, more fruit (total marketable count), respectively, when compared to the untreated check and 8.9% and 19.9% more fruit, respectively, when compared to the combination fungicide application.


Trademarks statement:

Companion Biological Fungicide is a registered trademark of Growth Products, Ltd. Switch62.5 WG is a registered trademark of Syngenta. Captan 50 WG is a registered trademark of Drexel Chemical Company. Pristine 38 WG is a registered trademark of BASF SE. Topsin-M is a registered trademark of Nippon Soda Company, Ltd.