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Abstract Adults and immatures of the filbert aphid, Myzocallis coryli (Goetze), a major pest of hazelnuts worldwide, were exposed to foliage treated with different concentrations of a botanical insecticide, Margosan-O, derived from extract of neem seeds. Both mature and immature stages were highly sensitive to this compound. Acute toxicity causing immediate mortality of young nymphs, particularly at higher rates (50 ppm or more), and chronic effects resulting in reduced offspring production, lengthening of nymphal development time and reduced survival of subsequent generation were recorded. The offspring production of adult aphids fed on treated leaves was reduced in a dosage-dependent manner, nearly 50% at 2.5 ppm to over 80% at 62.5 ppm. However, no nymphal survival was recorded at 25 ppm or higher doses. A repellency effect was also recorded, butthe feeding deterrence response was weak at best. Field trials also showed a marked reduction of aphid numbers on treated foliage, suggesting the effectiveness of neem against this major pest of hazelnuts. 相似文献
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以开菲尔粒为发酵剂发酵榛仁乳.选择影响开菲尔品质的4个主要因素糖用量、接种量、发酵温度和发酵时间设计单因素和正交试验L9(34),以确定开菲尔榛仁乳发酵的最佳工艺条件.结果表明:糖用量、接种量、发酵温度、发酵时间对试验结果均有显著影响.最佳发酵条件为糖用量(2%乳糖+5%蔗糖)、接种量5%、发酵温度23℃、发酵时间15... 相似文献
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平榛、欧榛及种间杂种过氧化物酶同工酶分析 总被引:4,自引:1,他引:3
为了阐明过氧化物(POD)同工酶在榛品种中的分布规律,探讨平榛、欧榛及其杂种榛之间的亲缘关系,选育优势杂交亲本,本试验采用聚丙烯酰胺凝胶垂直电泳,研究了34个榛品种(系)成熟叶过氧化物酶(POD)同工酶酶谱特征,结果表明:平榛、欧榛及其平欧杂种榛品种间酶谱具有较大差异;有的杂种品种遗失了父母本共有谱带P10;32个平欧杂种榛品种出现了双亲所不具有的新酶带,可作为鉴别杂种的一条途径。运用SAS软件的系统聚类类平均法,对34个品种进行聚类,分析聚类谱系图可知,大多数杂种榛与欧榛亲缘关系近而与平榛亲缘关系远,其中83-63、84-72和父本欧榛的亲缘关系最近,为优势回交亲本组合。 相似文献
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Weeds limit hazelnut productivity through competition and interference. Field experiments were conducted from spring 2010 through 2013 to evaluate string trimming alone or combined with herbicides in hazelnut orchards to control mugwort (Artemisia vulgaris L.), purple nutsedge (Cyperus rotundus L.), and burning nettle (Urtica urens L.). Treatments were mowing with a string trimmer (ST) alone, or ST followed by glyphosate, glyphosate + diflufenican, and glyphosate + carfentrazone-ethyl. These combinations also were applied with pendimethalin and oxyfluorfen as pre-emergence applications. The experiments were conducted in Fatsa-Ordu, Turkey, on a sandy clay soil with multi-stemmed trees (ocak). The combination treatments improved weed control compared to ST alone. Glyphosate plus carfentrazone-ethyl application 15 days after ST was the most effective treatment for control of these weeds. This combination was more effective in reducing seed bank reserves of A. vulgaris, C. rotundus and U. urens than herbicides applied alone or in mixtures throughout all seasons. Hazelnut yield was not significantly affected by herbicide treatments in 2010 or 2011. Hazelnut yield increased during the latter half of the experimental period, in 2012 and 2013. In a mixed population of A. vulgaris, C. rotundus and U. urens, 89 plants per m2 caused 12.1% yield loss. When the density increased to 256 plants per m2, yield losses increased to 29.7%. Hazelnut treated with ST followed by glyphosate plus carfentrazone-ethyl had the highest financial return. Post-emergence weed management systems in hazelnut should include ST followed by glyphosate plus carfentrazone-ethyl applications for maximum returns. 相似文献
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[目的]研究榛子果奶的配方及稳定性。[方法]以榛子仁汁、原奶为主要原料,白砂糖、榛子壳棕色素为辅料,通过单因素试验与正交试验优化果奶的配方,同时对榛子果奶的稳定性进行研究。[结果]试验表明,100 g榛子果奶中各成分的最佳添加量为:榛子仁汁6.5 g、原奶45.0 g、白砂糖6.0 g、榛子壳棕色素0.2 g、水42.3 g。在榛子果奶中添加蔗糖脂肪酸酯0.2%、单甘脂0.2%、羧甲基纤维素钠0.2%、黄原胶0.025%、卡拉胶0.05%,具有最佳的稳定效果。[结论]研究可为榛子的产业化开发利用提供可行的工艺及配方参考。 相似文献