Arbotect 20-S

Arbotect 20-S

SKU:
1201
$529.66

Arbotect 20-S is the industry standard fungicide for the prevention of Dutch elm disease (DED), suppression of sycamore anthracnose, and protection against Beech leaf disease (BLD). One application of Arbotect by macro-infusion protects the entire canopy for multiple growing seasons.

Arbotect 20-S SDS | Arbotect 20-S Label

Out of Stock

Please continue to place your orders with us by calling our Solution Center or your Territory Manager, as your material can be shipped in a timely manner when it becomes available.

The ideal timing for treating beech trees to control BLD is prior to the nematode dispersing from leaves to maturing buds, which peaks in September. Recent research suggests root flare injections of Arbotect 20-S provide the best results when applied prior to the end of July or early August. Treatment can be made later while the tree is actively transpiring, but it is important to note that nematodes will have already moved into the buds and will cause damage. As a result, the leaves of these trees will show symptoms of BLD when they emerge next year, however not as severe if they had not been treated at all. While treatments after July will provide benefit, consideration can be made for waiting until the late spring/early summer of 2026 for full impact.

When treating DED, you can apply until the onset of fall leaf color. Therefore, performing treatments into and after late August will be just as effective as performing treatments now.

Current Stock:
Description

Dutch elm disease:

  • Protects healthy elms from beetle transmission of Dutch elm disease for three growing seasons.
  • Annual treatments are not required. Provides "gap-free" protection.
  • Arbotect moves into the new growth in the spring and protects this tissue when the beetles are highly active.
  • Track record of performance is over 25 years with success rates over 99 percent.
  • *Do not treat Camperdown elm (Ulmus glabra 'Camperdownii')

Sycamore anthracnose:

  • Improves the appearance of infected sycamores over multiple years.
  • Application by macro-infusion is a closed system - no drift, and minimal applicator exposure.

Beech leaf disease (BLD):

  • The only systemic fungicide option for BLD.
  • Provides effective protection for two growing seasons.

Research article: Thiabendazole as a Therapeutic Root Flare Injection for Beech Leaf Disease Management

BLD 24c Labels:

Rainbow Recommends

Arbotect became the industry standard with Dutch elm disease for a simple reason: it works better than any other option. Elm trees are susceptible to infection early in the growing season but treatments cannot be performed until the tree is fully leafed out for the year. This means there is a several-week gap early in the year where other treatments leave the tree exposed to a possible infection. Arbotect not only lasts up to 3 years in the tree, but the product moves into the new growth. This allows a tree to be fully protected early in the season, which is a common time for elm trees to become infected.

Evaluation of Arbotect for Suppression of Sycamore Anthracnose (PDF)

Product Details
Active Ingredient:
Thiabendazole 26.6%
Signal Word:
Caution
Product Application:
Tree Injection
Unit Size:
1 Gallon
Unit Makes High:
53 DBH Inches (Elms and Large Sycamores)
Unit Makes Low:
80 DBH Inches (Beech and Sycamores)
Not registered for use in:
AK, AZ