In this paper, advice for establishment and management of Japanese quince (Chaenomeles japonica) orchards is summarised. Japanese quince is a minor fruit crop in Latvia and Lithuania, currently being developed by plant breeding research. Preferences for site and soil are discussed and recommendations for planting and field management are proposed

Kviklys, Darius

Ruisa, S.

Rumpunen, Kimmo

English

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93Management of Japanese Quince (Chaenomeles japonica) OrchardsManagement of Japanese Quince (Chaenomeles japonica)OrchardsD. Kviklysa*, S. Ruisab, K. RumpunencaLithuanian Institute of Horticulture, Babtai, Lithuaniab Dobele Horticultural Plant Breeding Experimental Station, Dobele, LatviacBalsgård–Department of Horticultural Plant Breeding, Swedish University of Agricultural Sciences,Kristianstad, Sweden*Correspondence to sodai@lsdi.ltSUMMARYIn this paper, advice for establishment and management of Japanese quince (Chaenomeles japonica)orchards is summarised. Japanese quince is a minor fruit crop in Latvia and Lithuania, currently beingdeveloped by plant breeding research. Preferences for site and soil are discussed and recommendationsfor planting and field management are proposed.INTRODUCTIONAmong the four known Chaenomeles species native to China, Tibet and Japan, Japanese quince(Chaenomeles japonica) is the species best adapted to the North European climate and it has been intro-duced as a minor fruit crop in Latvia and Lithuania (Rumpunen 2002, Tiits 1989, Tics 1992).  At present,we are aware of only one active plant breeding programme that is aimed at improving Japanese quince asa fruit crop. This programme is being jointly conducted by the Department of Plant Biology, HelsinkiUniversity, Finland; Dobele Horticultural Plant Breeding Experimental Station, Latvia; the LithuanianInstitute of Horticulture, Lithuania and Balsgård–Department of Horticultural Plant Breeding, SwedishUniversity of Agricultural Sciences, Sweden (Rumpunen 2002). As a first step to improve Japanesequince, phenotypic selection has taken place in orchards in Latvia and Lithuania. Superior selectionshave been cloned and planted in comparative field trials in Finland, Italy, Latvia, Lithuania and Sweden.Field management trials are in progress and will result in improved recommendations for growing ofJapanese quince.LOCATIONSite selectionFor the Japanese quince orchard, a sunny site on a slight slope should be chosen to reduce the risk of frostdamage to both flowers and fruits. However, the orchard could if necessary be established on plainground since the long and abundant flowering of Japanese quince plants reduces the risk of spring frostdamage.Japanese quince plants have a widespread and deep root system. The plants can therefore be grownin rather dry conditions, and Japanese quince have been recommended for cultivation on slopes to pre-vent soil erosion.94K. Rumpunen (Ed.) Japanese Quince – Potential Fruit Crop for Northern EuropeSOILSoil preferences and soil preparationIt is important to select a site with proper soil for optimum growth of Japanese quince plants. Well-drained, acid mineral soils with some content of organic material and some clay should be selected. SoilpH should be below 6, since Japanese quince plants are prone to chlorosis. In dry alkaline soils, plantchlorosis is likely to be more pronounced than in alkaline soils with sufficient moisture. In the case ofalkaline conditions, elemental sulphur or iron sulphate may be applied for soil acidification before plant-ing.Japanese quince plants are bad competitors, especially as young plants. Therefore perennial weedsmust be eliminated before planting. For this purpose repeated mechanical tillage or, in integrated grow-ing systems, herbicides may be used. Organic material (60–100 t/ha) should be supplied to sandy soilsand to poor soils before planting. If manure is used as a fertiliser, additional weed control is often needed.Before planting, mineral fertilisers and liming materials should be provided according to the soilrequirements as indicated by a soil test. Dolomitic limestone (calcium/magnesium carbonate), if neces-sary, should be applied half a year to a year before planting, whereas phosphorus and potassium may beapplied immediately before planting in amounts from 150 to 300 kg/ha. In the case of potassium, potas-sium sulphate is recommended (which will help to maintain a low pH) instead of potassium chloride.PLANTINGPlanting timeJapanese quince plants can be planted in early spring or in autumn. In areas with unstable snow cover andcold winters (temperatures below -20 °C) spring planting is recommended since young plants are vulner-able to winter frost damage. Spring planting may also be advantageous if the orchard is not fenced andprotected against hares and rabbits.If spring planting is preferred, special attention should be paid to the storage conditions for theplants. Japanese quince plants start to grow very early because of a short period of dormancy. Late springplanting may result in a reduced number of established plants, in particular if irrigation is not possible. Itis also necessary to store plants properly (-1 °C) since plants are very susceptible to grey mould (Botrytiscinerea).If planting is done during late autumn, the plants should be mulched using peat, wood chips orsawdust. The mulch layer must be at least 10 cm thick to prevent frost damage to the roots.Plant materialThroughout the Baltic countries, all commercial plantations with Japanese quince were previously estab-lished from seedlings. The mating system and the genetic diversity resulted in large variability in plantsfor traits such as plant growth, fruit ripening, fruit quality and yield. These traits were not significantlyimproved, despite repeated mass selection by growers and nurserymen. Therefore, seedlings should nolonger be planted. Instead, vegetatively propagated varieties, when available, should be used for estab-lishment of new commercial orchards.Since Japanese quince is a cross-pollinated crop, at least three different varieties should be plantedin the same orchard to ensure sufficient fruit set. For planting, potted plants should be used because theyhave better survival and start to bear earlier than bare-rooted plants. Field management and harvest aremade easier if erect and not too dense varieties are planted. Early varieties are preferable in areas withearly autumn frost.95Management of Japanese Quince (Chaenomeles japonica) OrchardsFigure 1. Recommended planting schemes for Japanese quince when three varieties are used (A, B and C).a) A being the main variety, B and C being pollen donorsBAAAACAAAABAAAACBAAAACAAAABAAAACBAAAACAAAABAAAACBAAAACAAAABAAAACBAAAACAAAABAAAACBAAAACAAAABAAAACb) VarietiesA, B and C planted in equal numberAABBCCAABBCCAABBAABBCCAABBCCAABBAABBCCAABBCCAABBAABBCCAABBCCAABBAABBCCAABBCCAABBAABBCCAABBCCAABBPlanting schemeThe planting scheme to be used for Japanese quince depends on the vigour of varieties and on fieldmanagement practices applied. Usually Japanese quince plants are planted at a distance of 2.5–3 m be-tween the rows and 0.6–0.9 m within the rows.When only one main variety is planted, a pollinator variety should be planted in every fifth row(Figure 1a). When all varieties are considered equally important, 2–4 rows should be planted of eachvariety, repeatedly (Figure 1b), to ensure good pollination and fruit set.FIELD MANAGEMENTField management practices should aim at creating proper conditions for the crop development through-out the life span of the orchard, which may be as long as 15–20 years.Weed controlThe ground should be kept free from weeds, at least in a strip 1 m wide within the rows. Between therows, a cover of grass may be established, which will provide a firm surface for field transport. To reducecompetition for water and nutrients during plant establishment, it is recommended that the grass is notsown until the second year.Mechanical weeding is the common method for controlling weeds in most orchards. For the dwarfand spreading Japanese quince plants, mechanical weeding is less efficient and must be complementedby hand weeding during the first three years. The equipment may also damage fruits during late stages offruit development, and mechanical weeding cannot be resumed until after harvest.In an integrated growing system, herbicides may be used to control weeds efficiently until August.At the same time labour costs are reduced compared to mechanical weeding practices. During fruit ripen-ing, weeds must be controlled mechanically and herbicides should be avoided in young orchards sincethey reduce growth of plants.For Japanese quince, any mulch tested was superior to herbicides and mechanical weeding in pro-moting a high yield (unpublished results). This may be partly explained by increased moisture and soil96K. Rumpunen (Ed.) Japanese Quince – Potential Fruit Crop for Northern Europetemperature, and partly by the fact that mechanical weeding and herbicides may negatively influenceroot growth.In Japanese quince orchards, mulching with organic material alone does not control perennial weeds.Weeds probably start to grow already at the beginning of the second vegetation period. To prevent germi-nation of annual weeds, 10 cm mulch should be provided in the first year and then 5 cm should be addedeach year. When wood chips or sawdust are used, nitrogen must be supplied to compensate for losses dueto mineralisation.The best weed control is achieved by synthetic mulches (e.g. black plastic and woven plastic), whichat the same time promote plant growth and yield (Figure 2). To improve durability, allow for traffic andmechanical harvesting, the synthetic mulch may be covered by gravel or organic mulch. Another advan-tage provided by the mulch is that the fruits are prevented from contamination by soil. The use of organicsynthetic mulches may also reduce infection by fungal diseases.NUTRIENT MANAGEMENTResults from fertiliser trials with varieties of Japanese quince plants are not yet available. The prelimi-nary advice for nutrient management is therefore based on fruit contents of macronutrients, yield esti-mates and experiences from apple and pear. The fertiliser recommendations should be further adjustedaccording to soil tests in each orchard.When the mineral composition of Japanese quince fruits was analysed for fruit flesh and seeds(Table 1), it was observed that the composition of macronutrients was close to that of pear. Thus, theestimated nitrogen requirement seems to be 2–3 times higher than for apple, mainly because of the highcontent of seeds (with proteins) in the Japanese quince fruit. Rather high amounts of potassium, calciumand magnesium were also detected in the fruit flesh. To compensate for yield losses alone at a yield of 10tons per ha, 80 kg N, 15 kg P, 120 kg K, 12 kg Ca and 6 kg Mg should be provided (Table 2). Thus,depending on the results of the soil analysis and expected yield, it may be recommended to supply 100–Figure 2. Black plastic is an efficient mulch for control of  weeds in Japanese quince (C. japonica) orchards.Furthermore, plant growth and yield are increased and fruits are not contaminated by soil.97Management of Japanese Quince (Chaenomeles japonica) OrchardsTable 1. The range and average (based on three genotypes) in composition of macronutrients in Japanese quince(C. japonica) fruit flesh and seeds. The fruit flesh and seeds constitute approximately 90 and 10%, respectively, ofthe fruit fresh weight.Nutrient Range (kg/ton) Average (kg/ton)Fruit fleshNitrogen, N 4.0–6.4 5.0Phosphorus, P 0.7–1.5 1.0Potassium, K 12.0–13.0 12.5Calcium, Ca 0.9–1.6 1.2Magnesium, Mg 0.3–0.5 0.4SeedsNitrogen, N 2.8–4.3 35.0Phosphorus, P 4.7–6.1 5.4Potassium, K 8.2–9.0 8.6Calcium, Ca 1.4–1.5 1.4Magnesium, Mg 2.1–2.5 2.3Table 2. The amount of macronutrients to be applied to Japanese quince (C. japonica) plants to compensate foryield losses at various yield levels.Yield N P K Ca Mg(ton/ha) (kg/ha (kg/ha) (kg/ha) (kg/ha) (kg/ha)1.0 8.0 1.4 12.1 1.2 0.65.0 40.0 7.2 60.3 6.2 3.010.0 80.0 14.4 120.6 12.4 5.915.0 120.0 21.6 180.9 18.6 8.920.0 160.0 28.8 241.2 24.8 11.8180 kg of nitrogen and 140–260 kg potassium (using non-chloride fertilizer) annually. In the case ofslightly alkaline conditions, the use of ammonium sulphate as the nitrogen source will help to maintain alow soil pH. In sandy, acid soils (at a pH below 5.5), deficiency of Mg may appear and additional Mgshould be provided as dolomitic limestone. Deficiency of Mg can also be induced by too high amounts ofpotassium fertiliser. In alkaline soils deficiency of iron may be compensated for by repeated foliar appli-cation of iron chelates, since soil application of iron chelates is not economically viable in practice.PESTS AND DISEASESThere are only few reports of pests and diseases on chaenomeles plants (for references see Norin &Rumpunen 2003). Among pests and diseases, fungal diseases appear to predominate. Symptoms of sev-eral fungi, causing leaf spot (e.g. Septoria cydoniae, Phoma pomorum, Alternaria alternata and Ramulariasp.), fruit spot (e.g. Septoria cydoniae, Phlyctema vagabunda, Alternaria alternata and Phoma exigua),and storage damage to fruits (Botrytis cinerea, Phlyctema vagabunda and Penicillium expansum) havebeen recorded, but none is currently considered severe, unless fruits are stored for a longer period. Fur-thermore, since fruits are not consumed fresh but processed, some damage to the skin may be tolerable.Japanese quince is thus considered a comparatively healthy plant, amenable to organic growing systems.98K. Rumpunen (Ed.) Japanese Quince – Potential Fruit Crop for Northern EuropeHARVESTThere are still no precise criteria for ripening, except that the skin turns yellow, the seed coat turns darkbrown, the skin gets sticky and the fruit becomes fragrant. In spite of the very firm fruit flesh, the fruitskin is very sensitive to mechanical damage. Fruits should therefore be handled carefully during harvest,if they are not immediately processed or frozen. If carefully stored in e.g. 12–15 kg boxes, the fruits couldbe stored for 2 months at 1 °C in a relative humidity of at least 85%.LITERATURENorin I., Rumpunen K. 2003. Pathogens on Japanese Quince (Chaenomeles japonica) Plants. In: Rumpunen K(Ed.) Japanese Quince – Potential Fruit Crop for Northern Europe. Final Report FAIR CT97-3894, SwedishUniversity of Agricultural Sciences, Alnarp, Sweden 37–58.Rumpunen K. 2002. Chaenomeles: Potential new fruit crop for Northern Europe. In: Janick J. & Whipkey A.(Eds.) Trends in New Crops and New Uses. ASHS Press, Alexandria, VA 385–392.Tics A. 1992. Krumcidonijas. Avots, Riga, Latvia 1–112. (in Latvian)Tiits A. 1989. Pöösasküdonia. Valgus, Tallin, Estonia 1–224. (in Estonian)

Management of Japanese quince (Chaenomeles japonica) orchards

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Management of Japanese quince (Chaenomeles japonica) orchards

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