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$Rhododendron Society of Canada Soci6t6 \ Canadienne du Rhododendron$

$Bulletin 1978 Soci6t6 \ Canadienne du Rhododendron$

$Rhododendron Society of Canada Soci6t6 \ Canadienne du Rhododendron$

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Page 16 The above program of soir fertirization has produced green reaves, adequate stem growth and good formation of flower buds in most;f my Rhododendrons and Azaleas. All plants have some flower buds in August, 1977 and about g0o/o of them are weil budded. The prants and frowei buds have overwintered satisfactorily even though the past two winters have been more severe than usual in our area. Lepidote (small scaly-leaved) and elepidote (large thick evergreen-leaved) Rhododendrons have responded well to the program . outlined above although some minor chrorosis can be observed in some prants. My Azaleas have grown and flowered well but this season r nave several Azaleas (smaller thin deciduous-leaved) that have some chlorotic leaves. some of the leaf-blades have yellowish to yellow-green to light-green intervein areas which contrast with the green veins. This is likely caused by insutficient soil acidity or by iron deficiency. Both young and old plants are affected. lf chlorotic plants do not respond to the usual fertilizer program after several years' the plants should be transplanted in fall or spririg. In planting a Rhododendron or Azalea, I now use a large amount of the following soil mixture around and below the root ball of each plant: 2 parts garden loam, 1 part sand, 3 parts Fafard peat moss, 1 part rotted cow manure or 1 part processed cow manure such as 1-1-1 or.7.7.7. This acidic soil mixture absoibs and retains water well and also admits air to the roots. several authors advise againsi covering the top of the root ball with soil but I have used about one inch of soil mixture with good results. fn Jufy, '1977,1examined a large collection of Rhododendrons and Azaleas in a Toronto garden and observed that some of the smaller younger Azaleas were quite chlorotic (yeltow leaf-btades probably caused by nitrogen ieficiency) and a few others were mildly chlorotic. A correspondent who is a specialist informed me that most gardens that he had visited showed chlorotic conditions in these plants. During the past two seasons, I have had only a litile trouble with chlorosis in the large-leaved elepidote Rhododendrons or the smaller_leaved lepidotes. lt is obvious, then, that chlorosis is a common problem with these plants in the lime-rich soil of southern ontario, and Azaleas seem to be more susceptible. commercial growers of course use ferrous (iron) sulphate to make the soil more acidic and chelated iron to correct iron deficiency. Aoth of these chemicals are used to cure or prevent leaf chlorosis, but at least chelated iron is toxic to the plants unless used in the correct concentration. Ammonium sulphate, which is another potentially toxic chemical if used incorrectly, is also used to correct nitrogen deficiency which can also cause leaf chlorosis. lf one choses to try to correct chlorosis with any of these chemicals, only one of them should be used at a time in the correct concentration. lf two or three chemicals are usect at the same time, too high a concentration of different ions may be produced which could prove to be quite toxic to the plants. lf the first chemical fails to cure the chlorosis, a suitable interval of time should be allowed before a second chemical is tried. This interval will provide a period when rains and sprinkler watering can i I I I
Page 1 and 2: {'ie* /&r\ Rhododendron Society of
Page 3 and 4: 'ZV t'll'l oueluo' uo16ur;rng'peou
Page 5 and 6: 'pualle ol palp uopuol aql ut slequ
Page 7 and 8: Page 4 CHEJU, ANOTHER TREASURE ISLA
Page 9 and 10: Page 6 GROWING RHODODENDRONS IN AUS
Page 11 and 12: Page 8 from the Forests Commission
Page 13 and 14: Page 10 is the ambition of the grou
Page 15 and 16: *, Page 12 PRUNING OF RHODODENDRONS
Page 17: Page 14 Before judging commences th
Page 21 and 22: I I oa4 ped eql 6uUnO 'sllnsor elen
Page 23 and 24: 'lepalpu 1ue1d ;eln1crugs 1o dno.r6
Page 25 and 26: 'uorlrsodu.roc ;euolcrd onllceJlle
Page 27 and 28: 'Jaqlo qope Lllt/rl astuot.u.req o1
Page 29 and 30: 'l lsocusH aoplraloC I lanures lBai
Page 31 and 32: uorlpls qcleeseu olll^luoy go 6rerg
Page 33 and 34: 'lnlsseccns ,{tq6lq paraplsuoc eq ,
Page 35 and 36: 'lnlssaccns ltq6tq polsplsuoc eq ,{
Page 37 and 38: 0AZ N08 erlocs pôN 'uoricunr iospu
Page 39 and 40: euAyqy ue1 6ulleJ Illlenb '7g 6u;1e

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