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Chandra R.,National Research Center on Pomegranatea | Jadhav V.T.,National Research Center on Pomegranatea | Dhinesh Babu K.,National Research Center on Pomegranatea | Maity A.,National Research Center on Pomegranatea
Acta Horticulturae | Year: 2011

An experiment was conducted on defoliation in pomegranate (Punica granatum L.) using chemical defoliants at the National Research Centre on Pomegranate, Solapur, Maharashtra (India). Defoliation in pomegranate is a very common practice followed in Maharashtra, Karnataka and Andhra Pradesh to induce synchronized flowering and fruiting. Ethrel, Thio-urea and Curacron alone or in combination with nitrogenous or potassic fertilizers are sprayed on pomegranate shrubs by growers during stress periods. Information on defoliation and twig sprouting percent with different chemical defoliants in pomegranate is very meager. In the present study, an attempt was made to test different chemicals for their efficacy towards defoliation and twig sprouting. Two-year-old pomegranate 'Bhagwa' plants were sprayed with Ethrel (0.3, 0.4 and 0.5%), Curacron (0.4, 0.8 and 1.2%), Dormex (0.5, 1.0 and 1.5%) and water (control) to study the effect of the defoliants and further twig sprouting during December 2008. All the treatments caused defoliation significantly over the control at the 7 th day itself. Except lower doses of Curacron (0.4 and 0.8%), all other doses of chemical defoliants caused leaf fall (defoliation) to a tune of 83.33 to 98.33% after 7 days of spraying. In case of Dormex, drying of lamina was noticed on the 2 nd day of spray but petioles were still green. However, after 15 days of spraying except control and lowest dose of Curacron (0.4%), all other treatments were at par to each other with respect to defoliation and their values ranged between 91.67-98.67%. The twig sprouting after 15 days of spraying was significantly better with lower doses of Curacron (0.4 and 0.8%), Ethrel (0.3 and 0.4%) and Dormex (0.5%). The sprouting percent in these treatments was found to be between (66.43-82.22%) and their effect was at par to each other. But the lowest sprouting (20.55%) was recorded in the control. However, the sprouting was more than 82.23% with all the doses of Curacron, Ethrel and Dormex after 21 days of spray and thus they were effective in inducing sprouting. Finally, Curacron 0.4%, Ethrel 0.3% and Dormex 0.5% were found to be effective for defoliation in pomegranate during the winter season. However, further studies on overall productivity and quality of fruits are yet to be evaluated. Source

Chandra R.,National Research Center on Pomegranatea | Jadhav V.T.,National Research Center on Pomegranatea | Sharma J.,National Research Center on Pomegranatea | Marathe R.A.,National Research Center on Pomegranatea
Acta Horticulturae | Year: 2011

Pomegranate (Punica granatum L.) is one of the important commercial fruit crops grown mainly on marginal and sub-marginal lands in the states of Maharashtra, Karnataka and Andhra Pradesh. The air layering method is commonly used for multiplication of planting materials. Grafting has not been tried in India for propagation of elite saplings. Presently, wilt is an emerging threat to the pomegranate industry under South Indian conditions and without availability of a standard grafting technique and tolerant rootstock, it is difficult to solve the wilt problem. In view of this, an attempt was made to standardize the grafting method and time so that grafting can be done on suitable rootstock that can help overcome the wilt problem. Two grafting methods (wedge and tongue grafting) and five dates (15 December, 30 December, 15 January, 30 January and 15 February) were evaluated during 2007-08 at the National Research Centre on Pomegranate, Solapur, Maharashtra, India. Oneyear- old seedlings of 'Phule Arakta' were used as a rootstock for the present study. In general, scion sprouting started between 8 and 12 days after grafting. Significantly higher scion sprouting was recorded with wedge grafting done in the last week of January after 15 (90.00%) and 21 (96.67%) days of grafting. Consequently maximum graft success (85.00%) was recorded after 90 days of grafting with wedge grafting done on 30 January. Plant height and scion length after 6 months of grafting was higher when wedge grafting was done between 30 December and 30 January. Grafted plants during this period had perfect union as indicated by normal diameter recorded at graft union. This reflected high scion and rootstock compatibility. However, performance of wedge grafted plants is to be evaluated under field condition. Source

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