Pub Date : 1987-10-01DOI: 10.1080/03015521.1987.10425603
J. M. Follett, J. Douglas
Abstract Growth of asparagus seedlings when grown in seven solutions with varying nitrate: ammonium ratios (NO3 -: NH4 +) was compared. The proportion of N present as NO3 - ranged from 100% to 50%. Asparagus grew best in NO3 - dominated solutions with maximum shoot and root growth occurring with NO3 -: NH4 + mixtures containing nitrogen as 17–40% NH4 +. Significant reductions in growth occurred with either 100% NO3 - or 50% NH4 +.
{"title":"Effect of nitrate:Ammonium ratios on growth of asparagus seedlings in sand culture","authors":"J. M. Follett, J. Douglas","doi":"10.1080/03015521.1987.10425603","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425603","url":null,"abstract":"Abstract Growth of asparagus seedlings when grown in seven solutions with varying nitrate: ammonium ratios (NO3 -: NH4 +) was compared. The proportion of N present as NO3 - ranged from 100% to 50%. Asparagus grew best in NO3 - dominated solutions with maximum shoot and root growth occurring with NO3 -: NH4 + mixtures containing nitrogen as 17–40% NH4 +. Significant reductions in growth occurred with either 100% NO3 - or 50% NH4 +.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"153 1","pages":"497-499"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73991097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-10-01DOI: 10.1080/03015521.1987.10425597
G. Scobie, N. St-Pierre
Abstract In formulating fertiliser recommendations for phosphorus fertiliser use on New Zealand pastures, it is important to incorporate the residual effect. The Cornforth-Sinclair static model for generating maintenance requirements was extended and a dynamic response model developed. This allowed the implications of different fertiliser strategies to be traced through time. Limited evidence from field trials was analysed to estimate the carryover effect. Further research into this parameter could show a substantial rate of return.
{"title":"Economics of phosphorus fertiliser use on pastures 2. Incorporating the residual effect","authors":"G. Scobie, N. St-Pierre","doi":"10.1080/03015521.1987.10425597","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425597","url":null,"abstract":"Abstract In formulating fertiliser recommendations for phosphorus fertiliser use on New Zealand pastures, it is important to incorporate the residual effect. The Cornforth-Sinclair static model for generating maintenance requirements was extended and a dynamic response model developed. This allowed the implications of different fertiliser strategies to be traced through time. Limited evidence from field trials was analysed to estimate the carryover effect. Further research into this parameter could show a substantial rate of return.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"8 1","pages":"445-451"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84202529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-10-01DOI: 10.1080/03015521.1987.10425600
C. Kingston
Abstract Boysenberries were machine harvested for two consecutive seasons using a fingerdrum harvester. In the second season a ‘Littau’ (beater) harvester was also used. Yield losses always occurred when plots were mechanically harvested; saleable yield was 51–66% that of handpicked plots. The major source of yield loss was fruit loss to the ground during harvest. The lower mean berry weight of machine harvested fruit, removal of immature fruit, and breakage of fruiting laterals resulted in much smaller losses. We were unable to account for some of the yield loss. Quality of harvested produce was influenced by the harvester type used and temperature at harvest. Fruit harvested by the fingerdrum machine were always more acidic than fruit harvested by the Littau or by hand. Handpicked fruit were firmer than machine harvested fruit only when harvesting was done during the cooler part of the day. Delaying the time of first harvest until 60% of fruit were visually ripe did not significantly reduce saleable yie...
{"title":"Boysenberry: Factors influencing efficiency of machine harvesting","authors":"C. Kingston","doi":"10.1080/03015521.1987.10425600","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425600","url":null,"abstract":"Abstract Boysenberries were machine harvested for two consecutive seasons using a fingerdrum harvester. In the second season a ‘Littau’ (beater) harvester was also used. Yield losses always occurred when plots were mechanically harvested; saleable yield was 51–66% that of handpicked plots. The major source of yield loss was fruit loss to the ground during harvest. The lower mean berry weight of machine harvested fruit, removal of immature fruit, and breakage of fruiting laterals resulted in much smaller losses. We were unable to account for some of the yield loss. Quality of harvested produce was influenced by the harvester type used and temperature at harvest. Fruit harvested by the fingerdrum machine were always more acidic than fruit harvested by the Littau or by hand. Handpicked fruit were firmer than machine harvested fruit only when harvesting was done during the cooler part of the day. Delaying the time of first harvest until 60% of fruit were visually ripe did not significantly reduce saleable yie...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"17 1","pages":"477-484"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84218786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-10-01DOI: 10.1080/03015521.1987.10425591
M. Hare, M. Rolston
Abstract Defoliating ‘Grasslands Puna’ chicory (Cichorium intybus L.) after October severely reduced seed yields. In 1984–85 there were no significant differences in seed yield between closing (date of last defoliation) at the beginning of May, August, September, or October. The highest seed yield, 282 kg/ha, was from a September closing. In 1985–86 the May closing produced the highest seed yield, 228 kg/ha. In general stem populations appeared to be the most important component of seed yield, particularly in the early closed crops. Stem populations tended to decrease with the age of the crop. Earlier closing gave a more concentrated flowering and made harvesting easier to judge. The plant growth regulator paclobutrazol had no effect on seed yields. From October onwards Puna chicory accumulated herbage very rapidly, over 200 kg dry matter/ha per day.
{"title":"Effect of time of closing and paclobutrazol (PP333) on seed yield of ‘Grasslands Puna’ chicory (Cichorium intybus L.)","authors":"M. Hare, M. Rolston","doi":"10.1080/03015521.1987.10425591","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425591","url":null,"abstract":"Abstract Defoliating ‘Grasslands Puna’ chicory (Cichorium intybus L.) after October severely reduced seed yields. In 1984–85 there were no significant differences in seed yield between closing (date of last defoliation) at the beginning of May, August, September, or October. The highest seed yield, 282 kg/ha, was from a September closing. In 1985–86 the May closing produced the highest seed yield, 228 kg/ha. In general stem populations appeared to be the most important component of seed yield, particularly in the early closed crops. Stem populations tended to decrease with the age of the crop. Earlier closing gave a more concentrated flowering and made harvesting easier to judge. The plant growth regulator paclobutrazol had no effect on seed yields. From October onwards Puna chicory accumulated herbage very rapidly, over 200 kg dry matter/ha per day.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"54 1","pages":"405-410"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84562398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-10-01DOI: 10.1080/03015521.1987.10425595
A. Vlassoff, R. V. Brundson, E. Marshall
Abstract The effects of ‘high’ and ‘low’ levels of trichostrongylid larval challenge were examined in two groups of 2-year-old Friesian steers. Different autumn/winter levels of larval infestation were established on two similar suites of paddocks by controlling contamination during summer and early autumn. Maximum pasture larval recoveries during autumn were 2110 larvae/kg herbage for the high challenge and 48 larvae/kg for the low challenge suites. The mean liveweight gain (April–June) of the steers exposed to the higher larval challenge was reduced by about 20 kg. Over the same period the mean plasma pepsinogen level for the high challenge group had more than doubled, whereas that for the low challenge group was virtually unchanged. Faecal egg counts were less than 50 eggs per gram of faeces for both groups throughout the trial. Apart from the divergence in liveweight gain of the two groups there was no other evidence of clinical parasitism. Although possible paddock interaction was not measured, the p...
{"title":"The effects of natural trichostrongylid larval challenge on 2-year-old Freisian steers","authors":"A. Vlassoff, R. V. Brundson, E. Marshall","doi":"10.1080/03015521.1987.10425595","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425595","url":null,"abstract":"Abstract The effects of ‘high’ and ‘low’ levels of trichostrongylid larval challenge were examined in two groups of 2-year-old Friesian steers. Different autumn/winter levels of larval infestation were established on two similar suites of paddocks by controlling contamination during summer and early autumn. Maximum pasture larval recoveries during autumn were 2110 larvae/kg herbage for the high challenge and 48 larvae/kg for the low challenge suites. The mean liveweight gain (April–June) of the steers exposed to the higher larval challenge was reduced by about 20 kg. Over the same period the mean plasma pepsinogen level for the high challenge group had more than doubled, whereas that for the low challenge group was virtually unchanged. Faecal egg counts were less than 50 eggs per gram of faeces for both groups throughout the trial. Apart from the divergence in liveweight gain of the two groups there was no other evidence of clinical parasitism. Although possible paddock interaction was not measured, the p...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"125 1","pages":"429-433"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86033304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-10-01DOI: 10.1080/03015521.1987.10425590
M. Gray, C. Korte, W. M. Christieson
Abstract Pasture growth rates are presented for a site at Waerengaokuri near Gisborne. Yields were obtained from grazed swards using a movable cage technique. The mean yield and standard error of individual samples over 8 years of measurement are given for standard dates at 14 day and 28 day intervals. With 14 day intervals, mean annual yield was 11.6 t DM/ha. Of this total 33%, 35%, 25% and 7% was produced in spring (September—November), summer, autumn and winter respectively. With 28 day intervals, annual yield was greater (13.5 t DM/ha), especially during spring and summer. Contribution of the main species to annual yield were: Lolium perenne L. 28%, Agrostis capillaris L. 24%, Trifolium repens L. 16%, Anthoxanthum odoratum L. 8%. Reductions in phosphate fertiliser arid pasture utilisation were associated with reductions in annual yield and Trifolium repens L. content of the pasture. General climatological data, rainfall and mean air temperatures during the period of pasture measurement are given.
摘要:本文介绍了吉斯伯恩附近Waerengaokuri的牧草生长速率。产量是利用活动笼技术从放牧的草地上获得的。每隔14天和28天，个别样本在8年测量期间的平均产率和标准误差均为标准日期。间隔14 d，年均产量为11.6 t DM/ha。其中33%、35%、25%和7%分别产自春季(9 - 11月)、夏季、秋季和冬季。间隔期28 d，年产量更高(13.5 t DM/ hm2)，春季和夏季产量最高。主要树种对年产量的贡献率分别为:黑麦草28%、毛梗草24%、三叶草16%、花楸8%。磷肥和牧场利用率的减少与牧草年产量和三叶草含量的减少有关。给出了牧草测量期间的一般气候资料、降雨量和平均气温。
{"title":"Seasonal distribution of pasture production in New Zealand XX. Waerengaokuri (Gisborne)","authors":"M. Gray, C. Korte, W. M. Christieson","doi":"10.1080/03015521.1987.10425590","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425590","url":null,"abstract":"Abstract Pasture growth rates are presented for a site at Waerengaokuri near Gisborne. Yields were obtained from grazed swards using a movable cage technique. The mean yield and standard error of individual samples over 8 years of measurement are given for standard dates at 14 day and 28 day intervals. With 14 day intervals, mean annual yield was 11.6 t DM/ha. Of this total 33%, 35%, 25% and 7% was produced in spring (September—November), summer, autumn and winter respectively. With 28 day intervals, annual yield was greater (13.5 t DM/ha), especially during spring and summer. Contribution of the main species to annual yield were: Lolium perenne L. 28%, Agrostis capillaris L. 24%, Trifolium repens L. 16%, Anthoxanthum odoratum L. 8%. Reductions in phosphate fertiliser arid pasture utilisation were associated with reductions in annual yield and Trifolium repens L. content of the pasture. General climatological data, rainfall and mean air temperatures during the period of pasture measurement are given.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"16 6","pages":"397-404"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91469959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-10-01DOI: 10.1080/03015521.1987.10425599
N. St-Pierre, G. Scobie
Abstract The models used for generating recommendations for phosphorus fertiliser use on New Zealand pastures were extended to incorporate the risk associated with environmental variabilty. A series of Monte Carolo experiments was conducted to compare the means and variances of gross margins from different fertiliser strategies. Stochastic dominance analysis was used to seek preferred strategies. The uncertain nature of the level of production if phosphatic fertiliser is withheld and the consequence of variability in the measured Olsen P soil test values were considered.
{"title":"Economics of phosphorus fertiliser use on pastures 4. Incorporating risk","authors":"N. St-Pierre, G. Scobie","doi":"10.1080/03015521.1987.10425599","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425599","url":null,"abstract":"Abstract The models used for generating recommendations for phosphorus fertiliser use on New Zealand pastures were extended to incorporate the risk associated with environmental variabilty. A series of Monte Carolo experiments was conducted to compare the means and variances of gross margins from different fertiliser strategies. Stochastic dominance analysis was used to seek preferred strategies. The uncertain nature of the level of production if phosphatic fertiliser is withheld and the consequence of variability in the measured Olsen P soil test values were considered.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"56 1","pages":"463-475"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78627579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-10-01DOI: 10.1080/03015521.1987.10425604
R. Testolin, R. Messina
Abstract Quantitative flowering of kiwifruit (Actinidia deliciosa (A. Chev.) C. F. Liang et A. R. Ferguson var. deliciosa) was investigated in 25 North Italian kiwifruit orchards to evaluate frost resistance following a severe cold spell in January 1985, when air temperatures dropped as low as — 23 °C. The percentage of fruitful shoots in female cultivar ‘Hayward’ began to decrease at — 11°C; at about — 18°C very few reproductive buds burst the following spring. As temperatures decreased, the proportion of vegetative shoots, arising from meristems in the basal axils of winter buds, increased. The male cultivar, ‘Matua’ reacted in a similar way to ‘Hayward’, but ‘Matua’ was more tolerant to frost injury. The same reduction in flowering shoots, resulting from a fall in temperature, was obtained at about — 1.2 to — 1. 8°C lower in male than in female plants in the range from — 11 to — 18°C. In no case was plant death observed. Acutely damaged plants were capable of regrowth from adventitious buds either of t...
猕猴桃(Actinidia deliciosa (A. Chev.))数量开花研究C. F. Liang和a . R. Ferguson (var. deliciosa)等人对意大利北部25个猕猴桃果园进行了调查，以评估1985年1月气温低至- 23°C的酷寒期后猕猴桃的抗冻性。在- 11°C时，雌品种‘海沃德’的实芽率开始下降;在- 18°C左右，很少有生殖芽在来年春天破裂。随着温度的降低，由冬芽基腋分生组织产生的营养芽的比例增加。雄性品种“Matua”的反应方式与“Hayward”相似，但“Matua”对霜害的耐受性更强。由于温度下降，开花芽的减少也相同，约为- 1.2比- 1。在- 11至- 18°C的范围内，雄性植株比雌性植株低8°C。在任何情况下都没有观察到植物死亡。急性损伤的植物能够从两种植物的不定芽中再生。
{"title":"Winter cold tolerance of kiwifruit. A survey after winter frost injury in Northern Italy","authors":"R. Testolin, R. Messina","doi":"10.1080/03015521.1987.10425604","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425604","url":null,"abstract":"Abstract Quantitative flowering of kiwifruit (Actinidia deliciosa (A. Chev.) C. F. Liang et A. R. Ferguson var. deliciosa) was investigated in 25 North Italian kiwifruit orchards to evaluate frost resistance following a severe cold spell in January 1985, when air temperatures dropped as low as — 23 °C. The percentage of fruitful shoots in female cultivar ‘Hayward’ began to decrease at — 11°C; at about — 18°C very few reproductive buds burst the following spring. As temperatures decreased, the proportion of vegetative shoots, arising from meristems in the basal axils of winter buds, increased. The male cultivar, ‘Matua’ reacted in a similar way to ‘Hayward’, but ‘Matua’ was more tolerant to frost injury. The same reduction in flowering shoots, resulting from a fall in temperature, was obtained at about — 1.2 to — 1. 8°C lower in male than in female plants in the range from — 11 to — 18°C. In no case was plant death observed. Acutely damaged plants were capable of regrowth from adventitious buds either of t...","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"95 3 1","pages":"501-504"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87681252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-10-01DOI: 10.1080/03015521.1987.10425592
S. Newton, G. Hill
Abstract Four populations of field beans (Vicia faba L.), ranging from 45 to 140 plants/m2 were established in late April and mid May, and at populations from 22 to 126 plants/m2 in mid August and late September. A seed yield of 516 g/m2 was obtained from high poulations in autumn and was independent of time of sowing in that season. However, a seed yield of only 300 g/m2 was obtained from early spring sowing. Delaying spring sowing by a further six weeks reduced seed yield to 147 g/m2. Irrigation increased seed yield of both spring and autumn sowings but did not completely compensate for the yield reduction which was caused by spring sowing. Foliar application of 10 kg/ha of nitrogen (N) applied to plants before flowering had no effect on yield or nitrogen concentration of seeds.
{"title":"Response of field beans (Vicia faba L cv. Maris Bead) to time of sowing, plant population, nitrogen, and irrigation","authors":"S. Newton, G. Hill","doi":"10.1080/03015521.1987.10425592","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425592","url":null,"abstract":"Abstract Four populations of field beans (Vicia faba L.), ranging from 45 to 140 plants/m2 were established in late April and mid May, and at populations from 22 to 126 plants/m2 in mid August and late September. A seed yield of 516 g/m2 was obtained from high poulations in autumn and was independent of time of sowing in that season. However, a seed yield of only 300 g/m2 was obtained from early spring sowing. Delaying spring sowing by a further six weeks reduced seed yield to 147 g/m2. Irrigation increased seed yield of both spring and autumn sowings but did not completely compensate for the yield reduction which was caused by spring sowing. Foliar application of 10 kg/ha of nitrogen (N) applied to plants before flowering had no effect on yield or nitrogen concentration of seeds.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"60 1","pages":"411-418"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89314186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-10-01DOI: 10.1080/03015521.1987.10425602
J. G. Charles, V. White, M. Cornwell
Abstract Leafroller larvae on raspberry (Rubus idaeus) canes at budburst were most often found in the most fruitful region of the cane (0.6–1.6m above ground level). Larvae usually destroyed both primary and secondary buds. Simulated larval damage at budburst and possible compensation by the cane was investigated by manually removing different numbers of buds. Canes compensated by producing more fruit per remaining lateral, but only following bud loss of 25%. Larval damage in most commercial raspberry gardens rarely exceeded 5%, so yield loss was directly related to bud loss. An economic assessment snowed that a single application of azinphos-methyl would be cost effective in gardens producing fruit for export if only one bud per 30 m of hedgerow of commercial raspberry planting was infested with leafroller. Such damage levels were frequently found.
{"title":"Leafroller (Lepidoptera: Tortricidae) damage to buds of raspberry canes in New Zealand","authors":"J. G. Charles, V. White, M. Cornwell","doi":"10.1080/03015521.1987.10425602","DOIUrl":"https://doi.org/10.1080/03015521.1987.10425602","url":null,"abstract":"Abstract Leafroller larvae on raspberry (Rubus idaeus) canes at budburst were most often found in the most fruitful region of the cane (0.6–1.6m above ground level). Larvae usually destroyed both primary and secondary buds. Simulated larval damage at budburst and possible compensation by the cane was investigated by manually removing different numbers of buds. Canes compensated by producing more fruit per remaining lateral, but only following bud loss of 25%. Larval damage in most commercial raspberry gardens rarely exceeded 5%, so yield loss was directly related to bud loss. An economic assessment snowed that a single application of azinphos-methyl would be cost effective in gardens producing fruit for export if only one bud per 30 m of hedgerow of commercial raspberry planting was infested with leafroller. Such damage levels were frequently found.","PeriodicalId":19285,"journal":{"name":"New Zealand journal of experimental agriculture","volume":"50 1","pages":"491-496"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86842255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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