Terpal

Manufacturer
BASF
Registered until
2025-01-31
Registration number
16463
Active materials
A soluble concentrate containing 305 g/litre (28% w/w) mepiquat chloride plus 155 g/litre (14.2% w/w) 2-chloroethylphosphonic acid.
A plant growth regulator for use in winter wheat, winter and spring barley, triticale and winter rye.
 
DIRECTIONS FOR USE
Terpal is a growth regulator which shortens and stiffens the straw of barley, winter wheat, triticale, and winter rye by reducing the length of internodes. Terpal will prevent or suppress early lodging during the vital crop heading stage and thus allow optimum fertiliser use for production of maximum yields in intensive growing systems. Lodging control and yield increase may be enhanced by using a programme of approved chlormequat chloride-based plant growth regulator followed by Terpal. This programme cannot be used on spring barley.
In winter barley and winter wheat, where Terpal is applied for the prevention of lodging, yield increases will often result when only a low level of lodging occurs, provided conditions are suitable for Terpal application at and after treatment. In winter barley this is particularly when used in a programme with an approved chlormequat chloride-based plant growth regulator The optimum effect of Terpal may be expected in a vigorous, actively growing crop, having a good plant population with an adequate nutrient and moisture supply. The greatest response will be seen in crops sprayed at the correct timing and when good growing conditions prevail at and after application.
 
Restrictions/Warnings
Terpal is recommended for use as a component of an intensive growing system where provision of optimum basic and nitrogen fertilisation has been made together with appropriate disease control measures. The nitrogen fertiliser rates should not, however, be increased without careful consideration of all the factors affecting the condition and the growth of the crop.
Application should be carried out with a field sprayer operating according to the manufacturer’s instructions. Ensure that the boom height is correctly adjusted.
Verification of node stages and emergence of the flag leaf is best done by splitting the stem.
Late secondary tillering can occur naturally in crops grown on soils subject to moisture stress and Terpal may accentuate this. This effect will be of more importance in barley varieties being grown for malting, where the presence of green heads may result in rejection of the crop for malting purposes. The prior use of an approved chlormequat chloride-based plant growth regulator (winter barley only) may help to reduce this problem in Terpal treated crops.
Do not apply Terpal to any crop suffering from herbicide damage or physical stress caused by waterlogging, drought or other conditions. Crops with a substantial moisture deficit should not be treated.
Avoid spray drift on to neighbouring crops.
Do not apply Terpal if rain or frost is expected, nor if the crop is wet, or if significant foot disease problems are expected, particularly with Take all.
Do not apply Terpal to winter varieties sown in the spring.
Do not apply Terpal to crops on soils of low fertility unless these crops regularly receive adequate dressings of basic and nitrogen fertilisers.
Do not apply Terpal to barley, triticale, or winter rye grown on soils containing more than 10 percent organic matter. Winter wheat grown on organic soils may be treated.
Do not apply Terpal at temperatures above 21°C. In these conditions it is best to apply Terpal in the evening.
Do not use straw from Terpal treated cereals as a horticultural growth medium or as a mulch.
Terpal may be applied to crops undersown with grasses and clovers.
Some delay in ear emergence may be noticed due to the shortening effect on the higher internodes.
Partial lodging may occur at later stages, though this leaning effect may be desirable to prevent ear loss from stiff strawed crops.
Do not apply Terpal when the leaf sheaths have split and the ears are visible.
Wash equipment thoroughly after use.
Addition of a non-ionic adjuvant can enhance the efficacy of Terpal. When using Terpal, an approved non-ionic adjuvant such as Activator 90 may be added to the spray tank at the rate of 40 ml per 100 litres spray solution.
 
Crops and Application
Winter Barley and Winter Wheat
Time of Application
Terpal may be applied to winter barley or winter wheat either as a single or split dose treatment. The preferred application method is to apply Terpal using the split dose.
Split Dose Treatment
The first dose should be applied from the second node detectable stage on the majority of tillers (BBCH GS 32) up to and including when the flag leaf is just visible on the majority of tillers (BBCH GS 37). Where an approved chlormequat chloride-based plant growth regulator has been applied previously to the crop, the preferred application will be towards the later end of this timing.
The second dose should be applied after the flag leaf is just visible (BBCH GS 37) up to and including first awns visible stage in winter barley (BBCH GS 49), or boots swollen in winter wheat (BBCH GS 45). Do not apply Terpal when the leaf sheaths have split and the ears are visible. If growing malting barley varieties, pay particular attention to Section 1, Restrictions/Warnings.
Single Dose Treatment
The optimum application timing is from the second node detectable stage on the majority of tillers (BBCH GS 32) up to and including when the flag leaf is just visible on the majority of tillers (BBCH GS 37). Where an approved chlormequat chloride-based plant growth regulator has been applied previously to the crop, the preferred application will be towards the later end of this timing.
If it has proven impractical to apply Terpal at the optimum timing, application at a reduced rate (see below) can still be made after the flag leaf is just visible up to and including first awns visible in winter barley (BBCH GS 49), or boots swollen in winter wheat (BBCH GS 45), but control of lodging may not be as good as with the earlier timings. Do not apply Terpal when the leaf sheaths have split and the ears are visible. If growing malting barley varieties, pay particular attention to Section 1, Restrictions/Warnings.
Spring Barley
Time of Application
The optimum application timing is from the second node detectable stage on the majority of tillers (BBCH GS 32), up to and including when the flag leaf is just visible on the majority of tillers (BBCH GS 37).
If it has proven impractical to apply Terpal at the optimum timing, an application can still be made up to and including first awns visible (BBCH GS 49), but lodging control may not be as good as with the earlier timings. Also, crops treated at the later timing are more likely to be subject to moisture stress; therefore particular attention should be paid to growing conditions when applying Terpal at this later timing.
Do not apply Terpal when the leaf sheaths have split and the ears are visible.
If growing malting barley varieties, pay particular attention to Section 1, Restrictions/Warnings.
Triticale
Time of Application
The optimum application timing is from the second node detectable stage on the majority of tillers (BBCH GS 32) up to and including when the flag leaf is just visible on the majority of tillers (BBCH GS 37). Where an approved chlormequat chloride-based plant growth regulator has been applied previously to the crop, the preferred application will be towards the later end of this timing.
If it has proven impractical to apply Terpal at the optimum timing, application at a reduced rate (see below) can still be made after the flag leaf is just visible up to and including the boots swollen stage (BBCH GS 45), but control of lodging may not be as good as with the earlier timings.
Do not apply Terpal when the leaf sheaths have split and the ears are visible.
Winter Rye
Time of Application
Apply Terpal from the second node detectable stage on the majority of tillers (BBCH GS 32) up to and including when the flag leaf is just visible on the majority of tillers (BBCH GS 37). Where an approved chlormequat chloride-based plant growth regulator has been applied previously to the crop, the preferred application will be towards the later end of this timing.
 Rates of Application
Apply Terpal as outlined below in a minimum of 220 litres of water per hectare. When using Terpal, an authorised non-ionic wetter must be added to the spray tank at the rate of 40 ml per 100 litres spray solution.
Qualified Approval
Terpal may be applied at up to 2.0 l/ha in 100 litres of water per hectare although efficacy at this reduced volume has not been evaluated. Application of this product at reduced-volume is at user’s risk with regard to biological efficacy and crop safety.
 
Mixing and Spraying
Apply as a MEDIUM spray, as defined by BCPC.
Never prepare more spray solution than is required.
Three quarters fill the tank with clean water and start the agitation. To ensure thorough mixing of the product, invert the container several times before opening. Add the required quantity of Terpal to the spray tank while re-circulating, and separately, the required amount of approved non-ionic adjuvant such as Activator 90. Add the remainder of the water and continue agitation until spraying is complete.
When tank mixes are to be used, take due note of any instructions given as to the order of mixing. Each product should be added separately to the spray tank and fully dispersed before the addition of any further product(s).
All tank mixes should be used immediately after mixing. NOTE: Always add an approved non-ionic adjuvant such as Activator 90 when using Terpal in tank mix.
Rinse empty containers thoroughly, using an integrated pressure rinsing device or by manually rinsing three times. Add washings to tank at time of filling and dispose of container safely.
 
Compatibility
Compatible Mixtures
Provided that all product recommendations are followed, Terpal is fully compatible with any of the following in two way mix: Aphox;Bravo 5001; Cheetah Super; Corbel1; Eclipse1; Ensign1;Epic1; Folicur ;Landmark1; Mantra; Opus1; Opus Team1 ;Punch C ;Starane 21; Tern3;
and in mix with: Bravo 500 + Corbel1,3; Bravo 500 + Folicur1; Corbel + Ensign2; Corbel + Epic2; Corbel + Folicur1 ;Corbel + Opus2; Corbel + Punch C1; Ensign + Epic1 ;Ensign + Opus1; Ensign + Tern2 ;Epic + Tern2 ;Folicur + Starane 21 ;Opus + Tern2.
 
1. When using tank mixes with these products, add the Terpal to the spray tank last.
2. When using tank mixes with these products, add the Epic, Ensign or Opus to the spray tank first.
3. Slight scorch may occur in this mixture. All tank mixes should be used immediately after mixing.
NOTES
Always add an approved non-ionic adjuvant such as Activator 90 when using Terpal in tank mix.
Mixtures Known to be Incompatible
Terpal + Eclipse + fluroxypyr
Terpal + mancozeb
Terpal + Opus Team + fluroxypyr
Terpal + metsulfuron-methyl
This list has been prepared in the light of information available at the time of publication. Other mixtures not referred to here may also prove to be incompatible.
Eclipse, Ensign, Epic, Opus, Opus Team and Terpal are BASF trademarks.
Punch is a registered trademark of E I du Pont de Nemours and Co Inc.
Aphox and Tern are registered trademarks of Syngenta.
Bravo is a trademark of GB Biosciences Corporation, a subsidiary of Syngenta.
Cheetah and Folicur are registered trademarks of Bayer CropScience.
Corbel is a registered trademark of Maag, Dielsdorf, Switzerland.
Starane is a trademark of Dow AgroSciences.
Registered for culturesRateBBCH
Winter wheat1 - 2 l32 - 51
Winter barley1 - 2 l32 - 51
Winter triticale1.5 - 2 l39 - 51
Spring triticale1.5 - 2 l39 - 51
Winter rye2 l39
Spring barley1 - 1.5 l32 - 51