EFFECT OF SOME PEAR ROOTSTOCKS ON GROWTH, FRUITING AND RESISTANCE TO FIRE BLIGHT DISEASE OF "LE-CONTE" PEAR CULTIVAR | ||||
| Fayoum Journal of Agricultural Research and Development | ||||
| Article 6, Volume 29, Issue 1, January 2015, Page 70-81 PDF (514.71 K) | ||||
| Document Type: Research articles. | ||||
| DOI: 10.21608/fjard.2015.192988 | ||||
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| Authors | ||||
| S.M. Abed Elrhim,1; N. Y. Abd El-Ghaffar2; A. K. M. Korra3 | ||||
| 1Deciduous Fruit Dept. Hort. Res. Instit., Agric. Res. Centre, Giza-Egypt | ||||
| 2Plant Pathol. Dept. Fac. of Agric., Ain Shams University | ||||
| 3Plant Pathol. Res. Inst., Agric. Res. Centre, Giza-Egypt | ||||
| Abstract | ||||
| This study was carried out during 2012 and 2013 seasons on "LeConte" pear trees budded on four rootstocks namely, "Winter Nelis", "Pyrus betulaefolia", "Pyrus calleryana" and "Pyrus communis", planted at ElKanater Horticultural Research Station, Kalubeia governorate, Egyp. This study was planned to evaluate the effect of these rootstocks on some horticultural characters as well as resistance the fire blight disease of "LeConte" cultivar. Trunk and shoot parameters of "Le-Conte" trees were lower on "P. communis" and "Winter Nelis" rootstocks than those on "P. betulaefolia" and "P. calleryana". Average numbers of spurs and average number of flowers/spurs or/shoot were high on "P. betulaefolia", moderate on "P. communis" and "P. calleryana" but low on "Winter Nelis". Full Blooming date was early on "P. betulaefolia" and "P. calleryana" (9–12 of March) which reflected on the production but late on "P. communis" and "Winter Nelis" (14–16 of March). Results cleared that, "P. betulaefolia" and "P. communis" rootstocks were more productive for "Le-Conte" cultivar than "P. calleryana" and "Winter Nelis". With respect of chemical fruit characters, TSS and TSS/acid ratio were high and acidity was low on "P. communis" and 'Winter Nelis", on the other hand, TSS and TSS/acid ratio were low and acidity was high on "P. calleryana" and "P. betulaefolia". However, "P. calleryana" and "P. betulaefolia" rootstocks under nature infection conditions, expressed resistance to fire blight disease but "P. communis" and "Winter Nelis" expressed susceptibility in this respect. There were a positive relationship between horticultural characters and resistance of pear tree to fire blight disease. "P. calleryana" and "P. betulaefolia" rootstocks as resistant were early in the flowering (9–12 of March) and had vigorous tree growth as well as fruit juice has less TSS and higher acidity. While "P.communis" and "Winter Nelis" rootstocks as susceptible to the disease were lately flowering (14–16 of March) and had week growth trees. as well as fruit juice has less acidity and higher TSS. Hence, P. betulaefolia" and "P. calleryana" showed more resistance to fire blight disease. However, "P. betulaefolia" is considered better rootstock to "Le Conte" cv. than "P. calleryana" which susceptible to lime-induced chlorosis. | ||||
| Keywords | ||||
| pear rootstocks; "Winter Nelis'; "Pyrus betulaefolia"; "Pyrus calleryana"; "Pyrus communis"; "Le-Conte"; fire blight disease; Erwinia amylovora; horticultural characters | ||||
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