Suppression of spininess in M.26 and P.22 apple rootstocks
2006
Jacyna, T., University of Agriculture, Lublin (Poland). Dept. of Pomology | Mazur, S., University of Agriculture, Lublin (Poland). Dept. of Pomology | Zajac, A., University of Agriculture, Lublin (Poland). Dept. of Pomology
These studies were conducted in three separate experiments including rootstock production (mound layering) and rootstock liners (tree production prior to budding) using M.26 and/or P.22 plant materials. To counteract spininess in examined plants dinitroaniline compounds; butralin, butralin + fatty alcohols (BFA), and pendimenthalin were applied. In a preliminary study late summer sprays of butralin at 4000 mg 1E-1 reduced spininess in stool beds of excessive spiny hybrids of Malus robusta 5 x M 9 but caused premature plant defoliation with no bark injury. In stools beds with M.26 plants two applications of 1500 mg 1E-1 did not affect spininess. In M.26 and P.222 rootstock liners two sprays of either butralin, BFA or pendimethalin at 1000, 2000 or 3000 mg 1E-1 (for butralin and BFA), or 1500, 2500 or 3500 mg 1E-1 (for pendimethalin) significantly reduced spininess as compared with intact plants but no differences in this respect among the chemicals and rates were found. Two manual operations were sowewhat more efficient in spine removal than chemical treatments but no practical differences between them in the field were observed. There were no adverse residual effects of chemical treatments on nursery tree performance (Jacyna et al., 2002).
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