from £4.95
from £4.95

Need advice? We are here to help. Call us on 0800 085 7995

free delivery on uk mainland orders over 50

Halo (Harpin)

Halo (Harpin)

Quick find: Halo_Harpin

In stock

Be the first to review this product

  • Increases yield and fruit quality
  • Improves nutrient uptake
  • Helps plants fight disease naturally
  • Reduces incidence of Botrytis
  • Extends product shelf-life
  • Offers frost protection on blossoming crops
  • Increases fruit sugars, 35% increases have been demonstrated
  • Increases calcium uptake by more than 20%
  • Reduces incidence of bacterial wilt


The active ingredient in HALO is Harpin Alpha Beta, a naturally occurring protein that activates the plant’s natural defence system. This is not to be confused with Harpin EA which is used in a well known product in the USA. Harpin EA is the first generation science with only a single receptor.


HALO Harpin Alpha Beta is the latest generation of the Harpin protein with 4 active sites. The increase in both number and nature of these active sites upon the protein, enable lower dose rates and a wider efficacy with a more positive effect on the crop.

The major component of HALO is the active ingredient - Harpin Alpha Beta (αβ). A bacterial protein that activates the plant’s natural defence system. This unique protein activates plant reactions after binding to the plant’s early warning receptors telling the plant it is under attack. These receptors respond by sending a message throughout the plant, initiating a sequence of physiological and biochemical reactions.

The resulting reactions activate both growth and stress-defence pathways within the plant, resulting in healthier and more productive crops.

The Harpin αβ protein in HALO evolved from the original native Harpin EA protein initially isolated from Erwinia Amylovora, the bacterium that causes fire blight in apples and other rosaceous plants. Harpin αβ is an acidic, heat-stable, glycine-rich, extracellular protein. The protein consists of 403 amino acids with no cysteine.



A higher growth rate due to an increase in photosynthesis by up to 25% (this is particularly noticed when growing under lights). In addition, the nutrient uptake in plants is also increased. Ultimately HALO provides value to growers by increasing yield and fruit quality.

Activates growth mechanisms that result in improved plant vigour, increased plant stamina and an improved stress-defence response. Activates cell wall expansion, cell elongation, protein and sugar transport and promotes flower initiation, fruit set and size. Activates defence mechanisms increasing the plant’s ability to defend itself against certain viral, bacterial and fungal plant diseases.

Pre-harvest applications reduce the incidence of botrytis (bud rot) and extends crop shelf-life. Increases fruit sugars, tests have demonstrated increases of over 35% in Gala apples, for example. Increased calcium uptake through the roots by more than 20%.

An increase in vegetative growth when applied in the growth phase of a plant. Offers some frost protection on blossoming crops.

In seed treatments trials, it has been found that HALO reduces the number of nematode eggs among plant roots by an average 50% or more.


How to Use

Foliar Application

Mix HALO in water at a dilution rate of 10ml per litre of tap water and apply with a sprayer. A HALO 2.5g soluble sachet will give maximum benefit when mixed with 500ml of water. Mixed in 1 litre of water it will be less concentrated but still offer great results. In general, apply every 2 weeks in flowering and once during the last week.


Seed Soak

Soak your seeds or tubers in a concentrated solution, 1 part HALO to 10 parts water. Allow to dissolve into solution for at least 30 minutes and shake to aid dissolving then soak your seeds or tubers for 10 minutes prior to sowing.


Timing of application

Since the plant needs to convert the eliciting effects from HALO into biochemical processes, the best effects are obtained when the product is applied to physiologically active plants. Treatments are recommended around critical crop physiological growth stages, such as flower induction, fruit set, fruit enlargement and pre-harvest. In some perennial crops, the treatment of HALO in the previous season can affect the plant in the following growth cycle or spring. This can also benefit cuttings/clones taken from the treated plant. This can result in earlier bud formation and hence greater flowering potential.

Always apply foliar feeds when the sun is down or when the lights are off to avoid scorching your plant.

Trials are also showing great benefits as a seed soak in some crops and this research is continuing.

Top Tip: If you need to keep your plants small, do not apply in the vegetative stage of their development.


Application Instructions

Mix one sachet with 500ml of water and spray. Apply 2-4 times throughout the growth cycle. Spray directly onto leaves at low light levels or just after grow lights are switched off.


We recommend the use of a wetting agent to aid foliar feeding.


Treatments are recommended around critical crop physiological growth stages such as exponential vegetative growth, flower induction and 1 week before harvest.


Top Tip: Let tap water stand for 24 hours before mixing with HALO


Reviews from feefo

There are no reviews yet

Your shopping basket has no items.

Write Your Own Review

You're reviewing: Halo (Harpin)

*How do you rate this product?