Plant Growth Regulator – Grape

Approved Plant Growth RegulatorCropTime of application / purposea.i. (ppm/gm/%) (Dosage per ha)Formulation (ml/gm/L tr/kg/%)Dilution In Water (Litres) / Preparation of solutionWaiting period / PHI
between last applicatio n             &
harvest (days)
Gibberellic Acid 40% WSGGrapePre Bloom- Elongation Fruit Setting Thinning 6-7mm berry size-enlargement 4050500
Gibberellic Acid Technical (90% w/w)Grape (Seedless)Two blanket spray at Ist full bloom & 2nd at post bloom stage.15-60ppm
Gibberellic Acid Technical (90% w/w)Grape fruita) At full bloom (for fruit set )- single spray
b) Ist week of May (For June fruit drop) –single spray
c) Ist week of October (For pre- harvest  drop)-single spray
Alpha Naphthyl Acetic Acid 4.5% SL (Na salt)Grapes(a)To increase size & weight of berries.  – Ist sprays at pruning
time.  – 2nd spray when flowering shoot appear
(b)To control berry drop (spray on matured grape bunches) 10- 15 days before harvesting.
10 ppm
100 ppm

2 ml in 49 ltrs.
20 ml. in 49 ltrs.

Forchlorfenuron 0.1% L (w/v)GrapesTwo dipping applications.
1st When size of berry is 3-4 mm diameter and
2nd When  size of berry is 6-7
mm diameter,
2ppm.1 ltrs.50060 days
Forchlorfenuron 0.12% EC w/wGrapesTo   enhance   the   fruit   size   in seedless  grapes  single  directed spray  on  berries  at        4-6  mm
berry size
3 ppm1.5 liter500
Gibberellic Acid Technical (90% w/w)GrapesTwo directed spray Ist at full bloom & 2nd at fruit set stages.100ppm.
Gibberellic Acid 0.001%LGrapesa)   First spray 30-35 days after pruning
b)   Second during the match head stage
0.018gm180 ml.450-500
Hydrogen Cynamide 50% SL (Import)GrapesFor breaking bud dormancy Single              application as spray Just after pruning ,1-1.5%2-3%375-50090-120 days
Hydrogen Cynamide 50% SL (Indigenous manufacture)GrapesFor breaking dormancy of fruiting buds
Just after pruning, single application by swabbing.
1.5%1.5 ltrs.Mix with 200-300
ml. of product in 10 litres of water.
120 days
Hydrogen Cyanamide 49% AS ( Import )GrapesFor breaking bud dormancy One directed spray, just after pruning.1.0-1.5%2-3%50 ltrs.110 days
Chlormequat Chloride 50% SLGrapes 1st spray:3-5 leaf stage after April pruning
5-7 leaf stage after April Pruning
500 g
Chlormequat Chloride 50% SLGrapes 2nd Spray:3-5 leaf stage after October Pruning1000 grm  a.i./ha  2000 ml1000L91
Chlormequat Chloride 50% SLGrapes 3rd Spray:3-5 leaf stage after October Pruning250 grm a.i./ha