Growth Products, Ltd: Horticulture

Control of Downy and Powdery Mildew on Cucumbers & Squash



Biorationals For Sustainable Agriculture

Our focus with biorational products provides sustainable solutions for agriculture, including biological fungicide for the control of both fungal and bacterial diseases. They not only reduce disease pathogens, but also decrease crop stress, enhance plant physiology benefits (ISR & SAR), stimulate root growth and maintain higher quality postharvest shelf life.

Three Modes of Action

Companion® Liquid Biological Fungicide contains a unique strain of Bacillus subtilis GB03 that has three different modes of action to fight disease-causing pathogens. By releasing a broad-spectrum antibiotic (Iturin), it disrupts the pathogens cell wall causing desiccation. Forming a protective zone around the roots, it boosts the plant’s immune system to fight disease, Induced Systemic Resistance (ISR), restricting the development of diseases. It also reduces the potential of the pathogen to develop resistance. In all studies crop yield was increased.

Research trials evaluated the efficacy of Companion® Biological Fungicide and “TKO” Phosphite 0-29-26, in combination with commonly used fungicides, and alone, for the control of disease and yield increase. They focused on improving cucumber and squash crops yield, fighting the diseases Downy Mildew (Pseudoperonospora cubensis) in cucumber and Powdery Mildew (Podosphaera xanthii) in squash.

Trials with “TKO” Phosphite, in combination with the pesticides, improved the overall disease control when compared to the stand alone chemical. Companion Biological Fungicide in combination with chemical fungicides also realized improved efficacy of the pesticide. Additionally, there is a zero-day, pre-harvest interval to control late season diseases. Companion is an ideal addition to resistance management programs, as its complex modes of action greatly reduce the ability of the pathogen to develop resistance.


Cucumber & Squash Testing Downy and Powdery Mildew

With “TKO” Phosphite 0-29-26 & Companion Biological Fungicide


cucumber study

DISEASE EVALUATION:

Foliage / Disease severity rating began on 18-Apr. Severity was evaluated using the overall area of diseased foliage. 5 representative plants, per replicate, per commodity were evaluated (means calculated using Horsfall-Barrett Scale (1-10)). Trial was inoculated on 8-Apr, following the first applications, by placing infected leaves at the ends of each commodity, in each plot. Similar inoculations continued on a weekly interval until disease pressure was established.

APPLICATION DATES:

7-Apr, 14-Apr, 18-Apr, 21-Apr, 25-Apr, 29-Apr, 2-May, & 6-May

APPLICATION METHOD:

CO2 Backpack Sprayer

TRIAL LENGTH:

Seeds sown on 25-Mar. Weekly applications began on 7-Apr. On 14-Apr application interval was shortened to every 4 days. A total of 8 applications were made. Applications were of either single product or 2 products in tandem.



Downy Mildew

Pseudoperonospora cubensis

TKO + BRAVO WEATHER STIK
TKO Rate: 2.0 Quarts per 100 Gal.
Bravo Rate: 1.5 Pints per Acre
BRAVO WEATHER STIK
Rate: 1.5 Pints per Acre
RANMAN (33.33SC)
Rate: 2.75 FlOz per Acre
TIMING: Weekly, 7-Apr-14-Apr,
then every 4 days 18-Apr – 6-May

Downy Mildew can develop at any stage of crop development, including the cotyledon stage, affecting plants of all ages, especially foliage which directly impacts the plant’s photosynthetic ability, resulting in stunted growth. The application of TKO Phosphite and Bravo reduced the disease incidence over the control by 68% and improved the overall performance of Bravo by an additional 31.4%.

TKO + BRAVO WEATHER STIK (75WG)
TKO Rate: 2.0 Quarts per 100 Gal.
Manzate Rate: 2.0 lbs. per Acre
MANZATE PRO-STIK (75WG)
Rate: 2.0 lbs. per Acre
RANMAN (33.33SC)
Rate: 2.75 FlOz per Acre
TIMING: Weekly, 7-Apr-14-Apr,
then every 4 days 18-Apr – 6-May


The application of TKO Phosphite and Manzate reduced the disease incidence over the control by 66% and improved the performance of Manzate by an additional 32%.

cucumber study

“TKO” Phosphite 0-29-26
Available in 5 gallon pails, 30 gallon drums, 275 gallon totes, and tank truckloads.

TKO + BRAVO WEATHER STIK

cucumber study

TKO + MANZATE PRO-STIK (75WG)

cucumber study

APPLICATION SPRAY Rate (by date): Boom Height: 16 IN
Application Date Nozzle Volume Speed Spray Volume
7-Apr: 0.23 GPM 3.82 M/H 29.3 GPA
14-Apr: 0.21 GPM 3.18 M/H 32.08 GPA
18-Apr: 0.2 GPM 2.73 M/H 49.26 GPA
21-Apr: 0.21 GPM 2.73 M/H 50.35 GPA
25-Apr: 0.21 GPM 1.79 M/H 57.56 GPA
29-Apr: 0.21 GPM 1.13 M/H 59.81 GPA
2-May: 0.18 GPM 1.36 M/H 66.32 GPA
6-May: 0.21 GPM 1.79 M/H 66.32 GPA



Downy Mildew

Pseudoperonospora cubensis

COMPANION + MANZATE PRO-STICK

cucumber study



COMPANION + BRAVO WEATHER STIK

cucumber study

COMPANION + MANZATE PRO-STICK (75WG)
Manzate Rate: 2.0 Lbs. per Acre Companion Rate: 1 Quart per 100 Gal.
MANZATE PRO-STICK (75WG)
Rate: 2.0 Lbs per Acre
TIMING: Weekly, 7-Apr-14-Apr,
then every 4 days 18-Apr – 6-May

It is a matter of scientific record that there is a synergy with certain biologicals when used both as tank mix with chemical pesticides, or in rotation. Since Companion is a gram-positive bacteria, it is not effected by chemical fungicides and will facilitate their efficacy. The results of this trial demonstrate that Companion Biological Fungicide improved efficacy of the Manzate Pro-Stick by 28.4%, adding even more certainty to avoiding resistance problems. Over all disease control over the untreated control was 65%.

COMPANION + BRAVO WEATHER STIK (75WG)
Bravo Rate: 1.5 Pints per Acre
Companion Rate: 1 Quart per 100 Gal.
BRAVO WEATHER-STIK (75WG)
Rate: 1.5 Pints per Acre
TIMING: Weekly, 7-Apr-14-Apr,
then every 4 days 18-Apr – 6-May

Preventive sprays are essential in the control of Downy Mildew, before spores blow in. Overall improved efficacy compared to the untreated control was 57.6%. Companion improved the performance of the Bravo by an additional 8.5%.

cucumber study

Companion® Biological Fungicide
Available in quarts, 2.5 gallon bottles, 10 gallon cases, 30 gallon drums, and 275 gallon totes.



Powdery Mildew

Podosphaera xanthii

TKO + BRAVO WEATHER STIK

cucumber study



TKO + MANZATE PRO-STICK (75WG)

cucumber study


TKO + BRAVO WEATHER STIK
TKO Rate: 2.0 Quarts per 100 Gal.
Bravo Rate: 1.5 Pints per Acre
BRAVO WEATHER STIK
Rate: 1.5 Pints per Acre
RANMAN (33.33SC)
Rate: 2.75 FlOz per Acre
TIMING: Weekly, 7-Apr-14-Apr, then
every 4 days 18-Apr – 6-May

Powdery mildew can over winter. Cucurbits are very susceptible to Powdery Mildew. Resistance to fungicides have been found in all parts of the US. Biorationals alternating or in combination with fungicides can reduce resistance problems. TKO Phosphite and Bravo reduced the disease incidence over the control by 76% and improved the overall performance of Bravo by an additional 9.3%. Ranman was ineffective in controlling the disease.



TKO + MANZATE PRO-STICK (75WG)
TKO Rate: 2.0 Quarts per 100 Gal. Manzate Rate: 2.0 lbs. per Acre
MANZATE PRO-STIK (75WG)
Rate: 2.0 lbs. per Acre
RANMAN (33.33SC)
Rate: 2.75 FlOz per Acre
TIMING: Weekly, 7-Apr-14-Apr, then
every 4 days 18-Apr – 6-May

The application of TKO Phosphite and Manzate reduced the disease incidence over the control by 56% and improved the Manzate efficacy by an additional 31%.


cucumber study

 

TKO Phosphite is a registered trademark of Growth Products, Ltd. Companion Biological Fungicide is a registered trademark of Growth Products, ltd. Ranman is a registered trademark of Ishihara Sangyo Kaisha, Ltd. Bravo Weather Stik is a registered trademark of Syngenta Group Company. Man-zate Pro-Stick is a registered trademark of United Phosphorous, Inc.