Fruit - Strawberry "special Botrytis & Powdery Mildew"

Study Investigator: John Curtis, PhD

Location of Study: Florida, USA - Open field

Study Period: January 2018 - March 2018

Main Program for this trial | Foliar Application

• Total program takes 42 days.
• DA means Days After

App 1

1Qt/Acre

First flowering

App 2

1 Qt/acre

7 DA App#1

App 3

1 Qt/acre

7 DA App#2

App 4

1 Qt/acre

7 DA App#3

App 5

1 Qt/acre

7 DA App#4

App 6

1 Qt/acre

7 DA App#5

App 7

1 Qt/acre

7 DA App#6

 

 

PROGRAMS: (For this trial)
  • • Foliar applications
  • • 7 applications @ 1 quart/acre (every 7 days)
  • • Total program: 1.75 gallons total program per acre
CONTROL

Plants were staked and maintained at a commercial level with fertilizer/insecticide but with no fungicide (liquid fertilizer through drip every other day).

 

TREATMENTS
  • • [T1]: Control (Ctrl)
  • • [T2]: Ctrl+Luna Sensation (GS+Luna)
  • • [T3]: Ctrl+Serenade Optimum+ Agphite (GS+Ser+Ag)
  • • [T4]: Ctrl+Vegro® 
  • • [T5]: Ctrl+Ser+Ag+Vegro® (T3+Vegro®)
  • • [T6]: Ctrl+Luna+Vegro® (T2+Vegro®)

 

 

APPLICATIONS FOR THIS TRIAL:

7 applications:

• 1/31/2018 (A);

• 2/7/2018 (B);

• 2/14/2018 (C);

• 2/22/2018 (D);

• 2/28/2018 (E);

• 3/7/2018 (F);

• 3/14/2018 (G)

 

 

AGRONOMIC PROTOCOL
  • Start date: January. 2018
  • Completion date: March. 2018
  • 8-week treatment (2 months)
  • Study conducted in Florida by John Curtis, PhD (Better Crops LLC) from January 2018 to March 2018 in open field.
  • Trial reliability: HIGH

 

 

METHODOLOGY
  • Plastic beds (28 inch top, 7 inch tall, 12 inch emitter tape) were prepared on 4 ft row spacing.
  • Strawberry (cv. radiant) were planted on 9/28/2017 in two (2) rows/bed (14 inch plant spacing).
  • Each plot was 30 ft length x 1 bed (30 ft length x 4 ft width) 
  • Foliar applications were made with a hand-held boom (CO2 operated, 40 PSI), fitted with three nozzles (TXVS8) and sprayed at 63.9 GPA.
  • Each treatment was replicated four (4) times.

 

 

EVALUATION (Fruit count & weight)
  • • 7 Harvests
  • • Marketable fruit (FRUMAR) count and weight (lb) for each plot were evaluated on 2/7/2018 (Harvest 1; 7 DAA), 2/14/2018 (Harvest 2; 7 DAB), 2/22/2018 (Harvest 3; 8 DAC), 2/28/2018 (Harvest 4; 6 DAD), 3/7/2018 (Harvest 5; 7 DAE), 3/14/2018 (Harvest 6; 7 DAF)and 3/21/2018 (Harvest 7; 7 DAG).
  • • At each evaulation date, fruit data were converted to lb/A as well as FLATS/A (COMPR0/ NUMBER 1 A)
  • • A FLAT/A is a standard measuring unit for strawberry growers in Florida and one (1) FLAT is equivalent to 9 lbs
  • • A FLAT is a standard measuring unit for strawberry growers in Florida.
  • • 1 FLAT = 9 lbs. Each FLAT contains 8 Clam Shells that weigh 1 1/8 lbs.
  • • A clam shell is the dressed product for end consumers.
  • • In addition, the total yield (Harvests 1-7) was calculated at 7 DAG in both lb/A and FLATS/A.

 

 

DISEASE METHODOLOGY
Botrytis:
  • BOTRSP (Botrytis cinera; grey mould of strawberry).
  • In each plot, 20 pieces of fruit were collected from 7 DAA through to 7 DAG.
  • The fruit from each plot (20) were placed into plastic tubs (clear), lined with paper towelling towelling and then sealed with a lid.
  • There were a total of 40 plastic tubs for each sampling time.
  • The plastic tubs were incubated at room temeprature (72 degree) for four (4) days and then the number of fruit with BOTRSP was counted in each tub.
  • The percentage (%) BOTRSP was then calculated.
Powdery Mildew:
  • PODOAP (Sphaerotheca macularis; powdery mildew of strawberry).
  • In each plot, the percentage (%) severity of PODOAP was estimated on four (4) 1 m sections of each plot from 7 DAB through to 7 DAG.

 

 

PHYTOTOXICITY:
  • Plants in each plot were examined for signs of phytotoxicity (stunting, discoloration etc.) at 10 DAG (10 days After G App) using a 0-100% rating scale; 0 = no phytotoxicity and 100% = dead plants.
  • Plants were examined for signs of phytotoxicity (stunting, discoloration etc.) at 5 DAF using a 0-100% rating scale.
  • Results obtained are stunning and this requires further agronomic trials. (in process 2017/18)

 

 

AGRICULTURAL SPECIFICITIES:

• Planting rate: 18,615 per acre
• Planting method: TRAHAN
• Row spacing: 4 feet
• Spacing within row: 14 inches
• Soil moisture: normal
• Soil Texture: 95.1% Sand
• pH: 6.5
• Soil Drainage: Excellent
• Seed bed: medium

Study Results


+30%

Botrytis: More efficacy in [T5] when Vegro® is simply added to the GS in [T3]

-64%

Botrytis: Best overall result obtained, [T5] with Vegro® added

-34%

Botrytis: Without Vegro® added in the same treatment [T3]

-36%

Botrytis: Less disease in [T4] when Vegro® is simply added to [T1] Ctrl.

+47%

Botrytis: is the degree of improvement between [T5] with Vegro® and [T3] without

+3%

Botrytis: Vegro® alone on top of the Ctrl [T4] is even more efficient than [T2]

48%

Pow Mild presence on control

-30%

Pow Mild severity: less when Vegro® added in [T5] Vs [T3]

-25%

Pow Mild: Less severity without Vegro in [T3]

+5%

Pow Mild: more efficacy when Vegro® added in [T5] Vs [T3] w/o

-21%

Pow Mild: reduction of the disease when Vegro® simply added to the Ctrl. [T4] Vs [T1]

+7,000

More Lbs per acre between GS [T3] and [T5] with simply Vegro® added

+20.4%

In % (extra yield/acre) between GS [T3] and [T5] with simply Vegro® added

+777

More flats per acre between GS [T3] and [T5] with simply Vegro® added

+20%

More flats/acre in % between GS [T3] and [T5] with simply Vegro® added

+218 Pcs

More fruit count between GS [T3] and [T5] with simply Vegro® added

+14%

More fruit count in % between GS [T3] and [T5] with simply Vegro® added

+19 Lbs

More weight count between GS [T3] and [T5] with simply Vegro® added

+20.2%

More weight count in % between GS [T3] and [T5] with simply Vegro® added

0%

With Vegro® zero Phyto-toxicity

Pressure disease:

Botrytis severity:

  • +30% More efficacy in [T5] when Vegro® is simply added to the GS in [T3] Ctrl+Serenade Optimum+ Agphite 
  • -64% Best overall result obtained in [T5] when Vegro® is added to [T3]
  • -36% Less disease in [T4] when Vegro® is simply added to [T1] Ctrl.
  • +47% is the degree of improvement between [T5] with Vegro® and [T3] without.
  • +3% Vegro® alon on top of the Ctrl [T4] is even more efficient than [T2] 

 

Powdery Mildew severity:

  • 48% is the degree in % of the disease severity in the control in [T1]
  • -30% Less disease when Vegro® is added in [T5] Vs [T3]
  • +5% More efficacy when Vegro® is added in [T5] Vs [T3] w/o
  • -21% Reduction of the disease when Vegro® simply added to the Ctrl. [T4] Vs [T1]

Quality yield:

  • +7,000 (+20.4%), More Lbs per acre between GS [T3] and [T5] with simply Vegro® added
  • +777 (+20%), More flats per acre between GS [T3] and [T5] with simply Vegro® added
  • +218 Pcs (+14%), More fruit count between GS [T3] and [T5] with simply Vegro® added
  • +19 Lbs (+20.2%) More weight count between GS [T3] and [T5] with simply Vegro® added

Early maturity:

  • 6 Harvests crop total
  • +43% early maturity with Vegro® over the 3 first harvests (50%)
  • +72% with Vegro® on the 3rd harvest

Health:

  • Observations on previous agronomic study confirm in this study the efficacy of Vegro® to help to improve the efficacy of the fungicides with a better control of the pressure disease.
  • It has been noticed a very uniform and consistent balance between fruit-set and vegetation.

Notes:

  • Another study on strawberry has been achieved in California with prestigious Phd agronomist and grower. Study completed and will be soon online as well.

 

Objectives: Evaluate the interest of VEGRO® to help to better control the pressure disease such as "Botrytis & Powdery Mildew".

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Variety Used: Radiant

Results on Botrytis and Powdery Mildew (In %)

• [H] for number of harvests
• [T] for treatments

Yield per acre (In Lbs)

• [H] for number of harvests
• [T] for treatments

Flats per acre (in unit)

• [H] for number of harvests
• [T] for treatments

Fruit count (Pcs)

• [H] for number of harvests
• [T] for treatments

Weight count (Lbs)

• [H] for number of harvests
• [T] for treatments

More Early fruits (yield per acre) = more revenues in [T5]

69%

Early maturity for H3,H4,H5 in [T5]

Yield per acre per harvest (early maturity index)

• [H] for number of harvests
• [T] for treatments
• This graph shows the production per harvest (stacked)