Bestseller In Stock
Chemjet® Tree Injector
Spring-loaded, reusable injector that delivers chemicals directly into the tree's vascular system. Uptake 3–4× faster than low-pressure rivals.
£15.00 · min 3
UK dispatch · Next-day dispatch · 24 hour UK delivery
Trusted by arborists in 30+ countries
Home of the Chemjet® Tree Injector
Leaders in eco-friendly treatments for tree diseases for over 25 years. Trusted by arborists worldwide to treat Phytophthora, Sudden Oak Death, Armillaria and more.
Fast UK Dispatch
Next-day dispatch with 24 hour UK delivery.
Secure Checkout
Stripe & PayPal · 256-bit SSL encrypted.
Eco-Friendly
Low-pressure injection, no chemical runoff.
25+ Years Proven
Trusted by arborists in 30+ countries.
— Since 2007 —
The UK Leader in Tree Treatments
We're a small, family-run business offering affordable, specialised care for every tree. Browse our Chemjet® Tree Injectors and professional-strength systemic fungicide, or read our family story to see how we got started. By blending tradition with modern techniques, we help your trees and landscape thrive year-round.
— Treatment For —
Proven results against these tree diseases
Disease control methods using the Chemjet® Tree Injector and Potassium Phosphite have been successful for:
- Phytophthora spp. including P. cinnamomi, P. cambivora, P. palmivora, P. cactorum
- Honey Fungus (Armillaria mellea)
- Root Rot in citrus and avocado
- Root Rot in conifers — nurseries, plantations and forests (incl. Christmas tree farms)
- Trunk cankers and fruit rots
- Oak Wilt
- Sudden Oak Death (SOD) — caused by Phytophthora ramorum
- Conifer Canker (conifer die-back)
- Ink disease in European Sweet Chestnut (Castanea sativa), Rhododendron, Noble Fir (Abies procera)
- Horse Chestnut (Aesculus hippocastanum) — Bleeding Canker & Leaf Miner Moth
- Plane Anthracnose (Apiognomonia veneta)
- Beech Decline and general tree declines in landscapes
- Silver leaf in Apple and Pear orchards
- Apple Scab (Venturia inaequalis)
- Bud / Nut Fall (Phytophthora palmivora) — Apples, Pears, Loquats, Quince, Coconuts
- Fire Blight (Erwinia amylovora); Black Spot (Diplocarpon rosae)
- Perennial Phytophthora Canker in Almonds, Walnuts
- Anthracnose in mango, sycamore, dogwood
- Pecan Scab (Fusicladium effusum)
- Phytophthora cinnamomi in macadamia nut
Phytophthora are the fungi that cause some of the most widespread serious root rot and foliar blight diseases on plants. Recent evidence suggests beneficial effects throughout the tree may counter a wider spectrum of disease-causing organisms, including plant pathogenic bacteria such as Pseudomonas syringae pv. aesculi — the causal organism of bacterial bleeding canker of horse chestnut.
— Our Range —
View all → Products
30% Active Ingredient In Stock
Potassium Phosphite
A fast-acting, highly mobile phosphite (PO3) fungicide that moves systemically through the tree. Boosts natural defences and treats Phytophthora root rot, Sudden Oak Death, canker and more.
From £15.00
Genuine Chemjet Part In Stock
Spare Injector Seals (Pack of 5)
A pack of five genuine replacement rubber seals for your Chemjet® Tree Injector. Keeps your injectors watertight and extends their working life.
£5.00
Best Value Starter In Stock
Single Tree Kit
Got just one tree to treat? This kit has everything: one Chemjet® Injector plus 100ml of Potassium Phosphite — enough for three 60cm diameter trees.
£25.00
New In Stock
4mm Drill Bit
Cobalt (M35) drill bit for drilling accurate injection holes in tough materials, with excellent heat resistance and durability.
£3.00
See how growers save their trees
From avocado farmers in Australia to oak specialists in Europe — read real case studies and peer-reviewed research.
Read Case Studies → — Watch It Work —
How does it work?
The only low-pressure injection system — minimises damage, maximises uptake.
Treat your trees in 4 simple steps
1
Drill
A 4.5mm hole, 40mm deep, at a 45° downward angle.
2
Load
Fill your Chemjet injector with diluted phosphite and lock.
3
Inject
Push firmly into the hole, twist to unlock — the tree takes it up.
4
Protect
Uptake completes in 3–45 min. Tree heals naturally.
Can't find what you're looking for?
Our family-run team replies to every enquiry the same day. You can also browse every product we stock or dig into the peer-reviewed research archive.