Chlormequat chloride is one of the important plant growth regulators which is a highly stable gibberellins biosynthesis inhibitor used to inhibit vegetative growth and cell elongation. Considering the importance of plant growth inhibitors, the present investigation was carried out to understand the effect of Chlormequat chloride with its different concentrations on vegetative growth, photosynthetic activities and its residual dissipation in Grapevines at two different locations one at Pune, Maharashtra India and second at Nashik, Maharashtra, India during the year 2018-2019. Chlormequat chloride was applied as a foliar spray, where the whole vines were sprayed at concentration of   500, 1000, 1500, 2000 and 2500 ppm with untreated control as a water spray; as a treatments with different developmental stages Viz 5th, 7th, and 15th leaf stage after foundation pruning. Morphological observations were recorded at 45 days and 90 days after foundation as well as fruit pruning. Application of Chlormequat chloride recorded reduced shoot length and Internodal distance while increased in cane diameters, leaf thickness after both the pruning’s in this investigation Photosynthetic activity, yield per vines and percent fruitfulness had significantly influenced with the application of Chlormequat chloride in grapevines. The dissipation of Chlormequat chloride was stable and indicated a non- linear pattern of degradation. Thus, implied that simple first-order kinetics might not be adequate to explain the dissipation behaviour of Chlormequat chloride in grapes.

The study was evaluated for the bio- efficacy and phytotoxicity of Glyphosate 41% SL against the complex weed flora in grapevines. The experiment was carried out at ICAR- NRC Grapes, Pune with seven treatments replicated thrice. The treatments were imposed at 3-4 leaf stage of weeds in vineyards. All the weed population were niformly distributed in vineyards.  All the treatments significantly reduced weed density over untreated control. The highest weed density was recorded with untreated control while, the negligible weed density was recorded in hand weeding followed by Glyphosate 41 % SL @ 4000 ml/ha at 15th, 30th, 45th Days after application. Least dry weight (g/m2) as recorded with Glyphosate 41 % SL @ 4000 ml/ha followed by Glyphosate 41 % SL @ 3000 ml/ha whereas, the maximum dry weight of weed (g/m2) was recorded with untreated control at 45th Days after application.  Highest weed control efficacy (%) was recorded with Glyphosate 41 % SL @ 4000 ml/ha followed by Glyphosate 41 % SL @ 3000 ml/ha whereas, negligible weed control efficacy (%) Was recorded with untreated control. The highest yield (kg/vines) was recorded with hand weeding treatments followed by Glyphosate 41 % SL @ 4000. The highest benefit: cost ratio was recorded in the treatment Glyphosate 41 % SL (4000 ml/ha) (1:1.99), while least in control treatment (1:1.77). Applications of Glyphosate 41 % SL @ 4000 ml/ha in grapevines showed highest weed control efficacy (%) and yield per vine (kg/vine) in this investigation.

Chemicals that slow cell division and cell elongation in shoot tissues and regulate plant height physiologically without formative effects. So far only chemical growth retardants are available in market which have residue problem. So, to overcome residue issue Vasumitra Life Energies Pvt. Ltd has developed a formulation of herbal extract having role in induction of fruitfulness as well as retardation of unwanted shoot growth. The extract was applied to vineyard at Pandharpur, during the year 2018-19 at different concentrations keeping Chlormequat Chloride (CCC) as check and one control treatment replicated five times at 5, 7 and 15 leaf stages after foundation pruning as well as 3 leaf stage after fruit pruning. The results revealed that significantly reduced shoot length, internodal length and increases the cane thickness of grape vine. The SPAD values, number of bunches per vine, weight of bunch were found significantly higher in treatments with herbal extract as compared to CCC and control. Fitochek @ 2 ml/lit showed highest fruitfulness percentage 65%, and yield 16.46 t/acre. It had no significant influence on berry length, berry diameter, TSS and acidity. Fitochek and control had no residues at harvest while CCC have residue above EU MRLs. Furthermore, no phytotoxic effects on grape vine were observed in any of treatments under investigations. From the above result and literature surveyed this is first report to demonstrate this novel organic compound (Fitochek) can be used effectively @ 2 ml/lit at different stages (After Foundation and fruit pruning) to retard unwanted shoot growth as well as overcome the residue problem.