BioWorks | Organics

RootShield® PLUS+ WP




RootShield® Plus WP Biological Fungicide is a preventative biological fungicide for control of plant diseases. The active ingredients are microbes, Trichoderma harzianum Rifai strain T-22 and Trichoderma virens strain G-41, which when applied to seeds, to transplants or other propagative material, or to soil or planting mixes, grow onto plant roots as they develop and provide protection against plant root pathogens such as Pythium, Phytophthora, Rhizoctonia, Fusarium, Cylindrocladium and Thielaviopsis. RootShield® Plus WP Biological Fungicide can be used alone or in conjunction with certain chemical fungicides.


  • Grows on roots, “shielding” them against root-damaging fungi
  • Controls up to 12 weeks
  • Two active ingredients (Trichoderma harzianum strain T-22, and Trichoderma virens strain G-41)
  • Preventative control of major root diseases including soilborne Phytophthora sp.
  • Also controls diseases caused by Rhizoctonia, Pythium, Fusarium, Thielaviopsis, and Cylindrocladium
  • Improved suppression of the aggressive hot-season Pythium
  • 0-hour REI*, 0-day PHI

*4-hour REI when used as a dip or dust

Registered for use in the USA except: AK

Plant Characteristics


Regional Growing Zone
1 - Northwest Coastal, 2 - California Coastal, 3 - Southern Mountain, 4 - Mountain, 5 - Midwest, 6 - Northeast Lakes, 7 - Great Lakes South, 8 - Appalacia, 9 - Southeast, 10 - South Florida, 11 - South Texas, 12 - Southwest
USDA Plant Hardiness Zones
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Temperature Zone
Warm, Cool, Transitional

How to Use & Apply


Rate per 100 gal: 6 oz
Rate per 1 gal: 1 level tsp
For peat based growing media:
• 10 – 12 fl oz of suspension per gal pot size
For cocoa growing media:
• 7 – 9 fl oz of suspension per gal pot size

Application Schedule

• Apply to growing media at seeding or rooting of cuttings
• Reapply when stepping up to next container size
• Protects 8 – 10 weeks
• If there is a history of disease pressure, reapply at 4 – 6 weeks


Disease Control

Growth Guide & Gallery


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