共查询到19条相似文献,搜索用时 78 毫秒
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二斑叶螨和苹果全爪螨对药剂敏感性比较试验 总被引:5,自引:0,他引:5
苹果全瓜螨一直是北方苹果园的重要害螨,二斑叶螨近年来也迅速蔓延。在害螨的防治中,由于长年大量、频繁地使用化学农药.致使许多药剂防效下降或害螨已产生严重的抗药性。本文通过室内杀螨剂对二斑叶螨和苹果全爪螨的毒力测定,比较2种叶螨对药剂敏感性差异,对吝螨的防治具有一定的指导意义。1材料与方法 (1)试虫苹果全爪螨,采自泰山普照寺果园;二斑叶螨,采自岱岳区满庄镇菜园, (2)供试药剂1%齐墩螨素乳油;15%哒螨灵乳油;20%甲氰菊酯乳油;20%三氯杀螨醉乳油;57%克螨特乳油;20%双甲眯乳油;15%三哇… 相似文献
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<正>苹果全爪螨(苹果红蜘蛛)是苹果园重要的害螨。为比较几种常用杀螨剂的药效,我们于2003年做了不同杀螨剂对苹果全爪螨的田间药效试验。 相似文献
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用虫螨光防治苹果全爪螨和中国梨木虱试验姜瑞德鹿世晋王继青刘淑芹(山东青岛市农科所266100虫螨光(1.8%阿维菌素乳油)是由阿佛链霉菌产生出的十六元大环内酯类抗生素杀虫杀螨剂,为明确其对苹果全爪螨和中国梨木虱的防治效果。我们于1996年用浙江德清拜... 相似文献
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虫螨光防治苹果全爪螨和中国梨木虱效果姜瑞德鹿世晋王继青刘淑芹(山东青岛市农科所266100)虫螨光(18%阿维菌素乳油)是由阿佛链霉菌产生出的十六环内酯类抗生素杀虫杀螨剂,为明确其对苹果全爪螨(苹果红蜘蛛)和中国梨木虱的防治效果,于1996年用浙江... 相似文献
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测定了高效氯氟氰菊酯和印楝素混剂对苹果叶螨的毒力,筛选出混剂最佳配比。结果表明:高效氯氟氰菊酯∶印楝素=1∶3时为最佳配比;田间使用最佳稀释浓度为1 500倍,该混剂对苹果叶螨的防治效果好、持效期长,具有推广价值。 相似文献
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为进一步明确夏季药液刷干技术在我国苹果树腐烂病防治方面的应用范围和效果,我们对陕、甘、豫、晋四省随机选取的110个苹果园按五点取样法进行了调查。结果显示,树龄6~25年的苹果园中,应用该技术的果园占调查果园总数的61.6%;相比未采用该技术的苹果园,发病株率平均降低48.7%。技术应用后,不同树龄苹果园单株新病斑数减少18.5%~50.7%,特别是苹果树主干部位病斑减少30.2%~50.5%。可见,夏季药液刷干技术对于苹果树腐烂病防控具有明显效果。同时应结合监测预警、增强树势、清除病残体等措施,实现该病害的可持续综合防控。 相似文献
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SUMMARYEight days after petal fall in 1991, mature 'Delicious'/MM. 106 apple trees and four days after petal fall in 1992, mature 'McintoshVMM. 106 were ringed, scored, root pruned (1 m from the trunk, two sides, 30 cm deep), or treated with ethephon (500 mg 11). Only ringing and scoring reduced vegetative growth. Ethephon advanced fruit maturation and fruit abscission, but root pruning did not affect the trees or fruit significantly. Mature 'Cort-land'/M.7a apple trees were root pruned 8 d after petal fall in 1991 and/or at full bloom in 1992. Root pruning reduced shoot growth, even in the year after treatment. Fruit abscission was reduced in 1991 and 1992 by root pruning in 1991, but root pruning in 1992 had no impact on abscission, in 1992. In an additional experiment, mature 'Mcintosh'/ MM.106 were root pruned 4 d after petal fall in 1991 or root pruned both in 1991 and at full bloom in 1992. Growth and preharvest fruit abscission were reduced in both the year of root pruning and the year after. 相似文献
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J.Vittrup Christensen 《Scientia Horticulturae》1979,10(2):155-165
A single-plant-plot design was found very suitable for a study of growth and yield effect of tree density, rectangularity and row orientation on a wide range of intra and inter-row planting-distances.Densities from about 250 to 40 000 trees per hectare were studied in 2 apple cultivars on 2 weak-growing rootstocks over a period of 8 years. On unpruned trees a maximum yield of 80 tons per hectare of ‘James Grieve’ and about 95 tons of ‘Spartan’ was recorded. At the highest densities these yields were reached 2–3 years after planting.As early as the second to third year the growth was restricted at densities over about 1000 trees per hectare. A higher yield per tree at medium densities than at lower densities for the first fruiting-years is supposed to be an effect of growth resulting in earlier fruiting.A high rate of rectangularity reduced the yield only on densities of 1200–1550 trees per hectare. The lack of a significant effect on lower and higher densities is discussed.The growth and yield of rows oriented North—South were 17% higher than of those oriented East—West. 相似文献
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分期施肥对富士苹果钙素吸收的影响 总被引:2,自引:0,他引:2
为了确定苹果钙的吸收利用与施肥时期的关系,以盛果期的富士苹果(Malus domestica cv.Fuji)为试材,比较了相同钙素含量分期施肥的效果,结果表明,春季一次性施肥能够大幅度提高当季土壤总钙和交换性钙、根系及幼果的钙浓度,但后期下降显著;春夏2次施肥能极显著提高夏季根系钙浓度,促进膨大期的果实吸收和积累大量的钙;分3次施肥能保持整个生长季节土壤和根系钙素供应水平的稳定,成熟果实钙的浓度和积累量明显高于其它施肥处理。研究结果进一步证实,幼果期能够吸收积累成熟果实46.8%~62.4%的钙,膨大期的果实能够继续吸收积累约总钙的33.85%~45.42%,即使是秋季,如果施肥也能积累较高比例的钙(占总钙量的13%~18.6%)。长期、适量的连续补充钙肥有利于改善果实的钙素营养。 相似文献
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<正>苹果采收后至第2年春季萌芽前的管理技术措施,对于来年的树体生长、开花坐果、产量和质量的提高均有很大影响。苹果采收后,是进行光合作用,为树体增加贮存养分的重要时期,同时也是病虫害寻找越冬场所进行休眠的阶段。所以,采收后要及时防治病虫害,破坏其越冬场所,减少病虫越冬基数;加强果园的土肥水管理,增加养分积累,恢复树势。 相似文献