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RootShield® Plus - WP

Trichoderma harzianum Rifai strain T-22 & Trichoderma virens G-41

OMRI Listed. RootShield Plus Is A Preventive Biological Fungicide For Control Of Major Root Diseases Such As Fusarium, Phytophthora, Pythium & Rhizoctonia.

An OMRI listed and EPA registered preventative fungicide - RootShield Plus WP contains two species of beneficial fungi that deliver an extended range of disease control. The two species are:

Apply RootShield Plus WP directly to seeds, transplants or other propagation materials including soil and planting mixes. The unique fungal blend in RootShield Plus WP provides 3 months of preventive control for Phytophthora, Rhizoctonia, Pythium, Fusarium, Thielaviopsis, and Cylindrocladium. Trichoderma helps prevent and control soil-born fungal diseases by colonizing plant root systems and boosting biological diversity in the root zone.


RootShield Plus WP grows onto plant roots, "shielding" plants from soil-borne diseases. This forms a physical barrier preventing root damage, while the fungi in RootShield Plus WP release enzymes that damage fungal pathogens. RootShield Plus is also available in a granular formulation.

REI: 0-hour, 4-hour when used as a dip or dust.

PHI: 0-day pre-harvest interval for all listed crops.

Suggested Uses: For prevention and control of major fungal pathogens and resultant diseases on greenhouse and nursery vegetables, herbs, ornamentals, fruits, conifer tree seedlings, various trees, legumes, oil seeds and peanuts. This product can be used in conjunction with certain fungicides. Refer to the product label and product compatibility sheet for details.



Use at the time of planting or early in the growing season for best results. One application provides up to three months of control. RootShield Plus WP is for use in soil applications (soil drench, in-furrow spray, and chemigation), seed treatments, and cutting or bare-rooted transplant dips on food crops, ornamentals, landscape plants, and ornamental trees, including tree seedlings for transplanting into the forest. Refer to the RootShield Plus WP product label for application rates by crop type. RootShield Plus WP should be applied via ground applications only.

Storage: Store in original container. RootShield Plus WP can be refrigerated or frozen to extend shelf life.



Shelf Life: Frozen: 12 months, Refrigerated: 9 months, Room temperature: 6 months

Active Ingredients/Guaranteed Analysis:

Trichoderma harzianum Rifai strain T-22*.....1.15%
Trichoderma virens strain G-41**..................0.61%

*Contains at least 1.0 x 107 colony forming units per gram dry weight.
**Contains at least 5.3 x 108 colony forming units per gram dry weight.



Product Label


Cannabis Sheet

Compatibility with Biological Control Agents

Additional Product Information

Product Compatibility

Drench Application Guide

Hydroponics Application Information

Rates for Small Volumes

Shelf Life and Storage


Apr 11, 2022  |  By Jerry Ainsworth

Delivered expeditiously and well packaged. These products most likely do seem to work and protect Cymbidium orchids against our endemic Fusarium and Rhizoctonia species. I am following a yearly rotation of using these agents; one year will use Howler and the next year RootShield and then the next year Hower, etc. I believe these products are far safer and far less dangerous than the systemic fungicides such as Heritage or Empress or others.

Feb 11, 2020  |  By meredith brooks

If you have any problems with fusarium, blight, wilt etc., esp. with tomatoes & peppers, this item is essential for long term survival and crop production. Combine it with a few active strains of mycorrhiza and no problemo!

Sep 9, 2019  |  By alex silber

I am very pleased with this new version of the original RootShield WP Plus. Much easier to use!

Apr 25, 2019  |  By Adam Salcedo

I have high hopes for RootShield Plus. We'll see in the coming months and years if it staves off Phytophthora on two Heritage Live Oaks.