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A guide to applicators in general use

Knapsack Sprayer

Type: Cooper Peg ler CP1 5 with pressure control valve fitted. Description Lever operated, with pressure control valve to give a constant flow rate to nozzle.

Spot Gun 0utlined is a concise description of three applicators in common use

· ·

Type: Selectokil Spot Gun Description Adapted from cattle dosing gun. Herbicide output, which can be adjusted from 1ml to 20ml, is through a cone nozzle producing circular spot 1m in diameter. Container capacity is 5 litres. Uses For Patch/Spot Application ideal for filling-in, rough terrain or when small patch/spots are required. Nozzles: Solid cone. Maintenance Repeated oiling of trigger mechanism with castor oil to ensure correct delivery. Partially fill with clean water and spray over waste ground. Remove nozzle and trigger mechanism and wash thoroughly. Repeat these operations 2-3 times daily.

Knapsack sprayer Spotgun Vehicular mounted

Uses General herbicide spraying patch/spot, band, overall. For insecticide spraying use cone nozzles. Nozzles Types VLY10 0 VLV20 0 Colour brassl orange brassl blue Uses General purpose gives 1.2m band Where larger volumes of water or wider band width, 1.4m, are required. Use with Cooper Pegler cowl




Their uses, nozzle types and parts are detailed, as is a brief summary of the maintenance procedure. This is followed by accounts of two applicators, the dribble bar and the nomix, that are not in common use. Results from field trials, carried out by the Forest Protection Section, involving these applicators are discussed.

Parts Item Diaphragm Lance tube 22 Washers Spray cowl 30cm Spray cowl 38cm Part No. 03347 SA04243123 03376 SA04 - 630 SA04 - 631 Maintenance Partly fill the knapsack sprayer with water andflushoutby spraying over waste ground away from watercourses. Remove nozzle and filters and wash thoroughly with water using a small paintbrush to remove any solids. Flush clean water through sprayer, wipe down outsides and oil moving parts.

Knapsack spraying

Vehicular Mounted Boom Sprayer

Type: S 600 - Tractor mounted boom sprayer Description Controlled droplet boom sprayer - 6 atomisers at 1.2m spacing giving an operating width of 7.2m. Later fitted with flood jets and equal pressure hoses for motor-manual operations. Uses General overall spraying. Patch/spot and band application requires the motormanual equipment. Nozzles

Types Microma x CDA Atomiser VLV too Colour Red Uses General purpose overall spraying Orange General purpose motor-manual spraying General purpose motor-manual spraying For use in multiple nozzle assemblies

VLV 200


Fan jet

Various types

Vehicular mounted boom sprayer

Maintenance The (rotary) atomized heads must be oiled every 4 hours with a light oil and worked thoroughly at the end of each day. * Atomizer heads should be stripped down periodically and the internal 9 grooves cleaned with a soft brush. Output


The suction filters should be checked daily and the boom hinges oiled weekly. The pump oil should be checked regularly. The sprayer should be cleaned out at the end of each working day.

Cleaning procedure:

1. Attach suction filter pipe to water source and turn 3 way valve through 180' Close pressure pump valve and chemical incorporation valve. Disconnect cam coupler on the tank end of the pressure reliefpipefrom the main pressure release valve. Switch to spray on and start PTO


3. OUTPUTAT I BAR (14.5 PSI) APPLICATOR VOLUME (LITRES) Forwardspeed km1hour 3 km 4 km 33 litres 40 litres 75 litres 90 litres 137 litres 102 litres


Micromax (blue) Micromca (red) Micromax (orange)

7 metres 7 metres 7 tnetres

1.2 litres/min 2.7 lareshnin 4.8 litres/min

Calibration 1. Close boom tap. 2. Engage PTO and switch on booms. 3. Open calibration tap and calibrate output.


The figures in this table are based on: a) A 7m boom with spray heads at 1.2m spacing b) 2 x ground speed (kmlhr) x application rate (11ha = ml/min1head).

Mention of product by name does not imply endorsement by Coillte Teoranta of any product to the exclusion of others which may be suitable.

Herbicide application - the Nomix Applicator

Materials and Methods

The Nomix compact comprises of a cartridge, containing a ready-mixed herbicide, attached to the rear compartment of a hand held lance. Four AA size alkaline batteries are inserted into the handle of the lance which also carries the operating trigger and trigger lock. A spray control switch is located on the lower section of the lance body directly under the trigger. This allows for approximate control of the swath width. The exact width may be obtained during spraying by raising and lowering the spray head at the end of the lance shaft. The spray head contains a spinning disc nozzle which is driven by an electric motor which is powered by the batteries. Two types of spinning disc nozzle are available: · the square spinner for swath widths front 15 to 60cm and · the serrated spinner for swath width sfrom 60 to 90cm. Using controlled droplet technology the system is designed to produce an even spread of droplets in the 200 to 400 micron range. Such droplets should fall vertically from the disc and not be prone to drift. The complete applicator weighs 2kg when ready to use. In preliminary testing, the Monsanto Nomix Systemic was used. This product contains 144 g/l glyphosate (Roundup) formulated in white pigmented emulsion. Having followed the manufacturer's instructions on cartridge loading, lance priming (to ensure an un- interrupted flow of herbicide from pack to nozzle), swath width and flow rate spraying was begun. The instructions provided should be fully understood and followed closely. Calibration of the lance should not be taken for granted as the calibration chart supplied is only an approximate guide. Following some understandable teething problems with the calibration of a new instrument the opinion was formed that some training would be required with the applicator prior to any large scale use. The lance was tested on two site types: grass/broadleaved weeds and a

The applicator worked well on the grass/broad leaved site. The manufacturer's claim that the 750ml pack would spot treat 750 trees was easily achieved on this site.

The Nomix applicator consists of a cartridge of ready mixed herbicide attached to a hand held lance with a spinning disc nozzle which is powered by a small electriemotor. The complete system weighs approximately 2kg. The lance was tested on a grassland site and a reforestation site which had broadleaved weeds and briars. Due to its lightweight, the system was found to be easy to use on both sites but it was more difficult to cover the target number of trees per cartridge on the reforestation site. Accuracy of application was good and no drift was encountered during the test. The lance was found to be more suited to spot application than

reforestation site with grass, broadleaved weeds and briar.

The light weight nature of the Nomix made for ease of movement over the rougher reforestation site but the target number of trees treated was less easily achieved. The test site was however, a particularly rough one. It was observed that the serrated spinning nozzle was hit from time to time by briar. Though no difficulties were encountered some reservations were noted on the possible effects this might have on the durability of the nozzle and the motor. The applicator worked well for spot application for which it seems best suited.


In this test, the Nomix was found to be accurate and easy to use. More long term testing will be required however, to cover such aspects as adaptability to various site types, durability and cost considerations (initial outlay, battery usage, herbicide pack price and costs of operational use). In the short term it may have good scope for use with Christmas tree crops.


At a weight of 2kg the applicator was found to be well-balanced in use and could be used for long periods without tiring or inducing any strain. The absence of contact with the concentrate in the pack, the lack of necessity for water except for personal hygiene needs, and the absence of a weighty knapsack on the back make this an attractive tool for the operator whatever other considerations are taken into account. The white pigment provides a distinct advantage in directing the spray to the target vegetation and for the observation of any drift (no drift was noted during test). More importantly the easy handling of the lance allows for ease of wrist action in directing the spray to avoid the plant and target the vegetation.

The Nomix Applicator

Herbicide application using the dribble bar


The dribble bar was developed for the control of weeds around trees which are sensitive to translocated herbicides. holes (dribble) without individual droplets being allowed to form. The dribble should develop between 0.2 and 0. 3 bar pressure. Calibration then proceeds as normal.

Materials and Methods

The dribble bar consists of a bar 0.5m long with holes drilled into it at 2.5cm intervals, fitted with a flow restrictor and filter. It is manufactured to fit CooperPeglar knapsack lances, but may also be fitted to other types of lances through the use of adapters. As the dribble bar is designed to work at low pressure it is necessary to have the sprayer fitted with a pressure control valve. For calibration the sprayer, with lance and dribble bar fitted, is fully pressurised while part filled with water. Pressure is then gradually reduced to produced a constant solid stream of water from the

The dribble bar is used for the control of weeds around trees which are sensitive to translocated herbicides. It may be used for band or spot application of herbicide. It has been found to be robust and to perform well and to give accurate placement of herbicide while eliminating drift. Difficulties have been found with calibration of the dribble bar.

The dribble bar is not suitable for application to germinating weeds as the herbicide is applied in bands 2.5cm apart.


In a preliminary test the dribble bar was found to be robust, as predicted. Drift was eliminated so the need for cowling was removed. Band application was achieved with the bar facing down. For spot spraying the bar was inverted. In this way the dribbles produced a slight fountain effect before falling down. This method gave the control necessary for application to the spot. For both band and spot application the dribble bar needs to be kept level at all times to operate effectively and efficiently.

At first it was difficult to achieve the required dribble but, that came with practice. Difficulties were encountered with calibration, which were not fully ironed out during the test. In addition, it was found necessary to use a piece of open electrical conduit, at least the length of the bar, in order to collect liquid from the bar during calibration to deliver to a measuring vessel.


While further testing needs to carried out, the-dribble bar was judged on this limited outing to perform well, giving accurate placement of herbicide without drift and without apparent damage to the trees.

For further information contact

Declan Ward, Forest Protection, Coillte Teoranta, Sidmonton Place, Bray, Co. Wicklow, Ireland. 1-1. 01 -867751, Fax: 01-2868126

The Dribble Bar

The information contained in this note is also available on computer disk as part of the ASK computer database. Reproduction of this information note is welcomed. Acknowledgement of its source would be most appreciated. Publication part-funded by COFORD, as part of the STRIDE, Forestry Sub-programme


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